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ClareOne Carbon Monoxide Detector Installation Sheet



The ClareOne Carbon Monoxide Detector (CLR-C1- CO) is a battery powered carbon monoxide detector and alarm device. This device is designed to protect you and your household from the dangerous effects of Carbon Monoxide.

To activate/turn on the CO detector:

  1. Remove the battery pull tab to engage the batteries.
  2. Carefully rotate the CO alarm onto the mounting plate. This activates the On/Off switch.
    The red, yellow, and green LEDs immediately flash in sequence.
    Note: For the display models, the LCD screen displays all icons).
  3. Wait 15 seconds after connecting the power before button testing.


  • Install a CO alarm in every room that contains a fuel burning appliance, particularly high occupancy areas e.g. bedrooms, kitchens etc.
  • In rooms with a fuel burning appliance, install (preferably) on the ceiling, (1 ft (300 mm) from walls) and between 5 ft to 10 ft horizontally from the appliance. In rooms remote from the appliance install the detector at ‘head height’, where the alarm indicators can be seen.
  • Test the alarm weekly by pressing the Test/Hush button, the alarm sounds (at a diminished sound output level initially and then quickly reach maximum sound output level).
  • Replace alarm after approximately 10 years operation (see ‘Replace by’ date on side wall label).
  • Avoid contamination by waiting until all construction is completed before fitting the alarm.
  • Individuals with health issues may consider warning devices which provide audible and visual signals for carbon monoxide concentrations under 30ppm.

Carbon monoxide

Many people are killed each year, and many more suffer ill health from Carbon Monoxide (CO) poisoning. CO is an invisible, odorless, tasteless and extremely toxic gas. It is produced by appliances and vehicles burning fuels, such as coal, oil, natural gas, propane, kerosene, paraffin, wood, gasoline, diesel, charcoal, etc. CO is absorbed by red blood cells in the lungs in preference to oxygen - this results in rapid damage to the heart and brain from oxygen starvation.

High levels of CO in a house can be caused by:

  • Incorrectly or poorly installed fuel-burning appliances.
  • Blocked or cracked chimneys/flues.
  • Blocked vents or draught-proofing which makes areas with fuel burning appliances or fireplaces airtight.
  • Engines of cars, lawnmowers etc. that are left running in confined spaces.
  • Portable kerosene or propane heaters in poorly ventilated rooms.

What happens when the CO alarm detects Carbon Monoxide?

When the alarm detects potentially dangerous levels of CO, it flashes the red alarm LED immediately and then sounds a loud alarm if the CO persists. Table 2 shows how the CO alarm reacts to different levels of CO gas and exposure time. At higher levels of CO, the alarm sounds sooner. The rate of flashing of the red LED indicates the level of CO. If your CO alarm sounds, follow the instructions on page 7, “When the alarm sounds.”

WARNING: Never ignore the CO alarm.

Carbon monoxide exposure and symptoms

The following symptoms may be related to Carbon Monoxide poisoning and should be discussed with all members of the household:

Mild exposure: Headaches, running nose, sore eyes, often described as “flu-like” symptoms.

Medium exposure: Dizziness, drowsiness, vomiting.

Extreme Exposure: Unconsciousness, brain damage, death.

Many cases of reported Carbon Monoxide poisoning indicate that while victims are aware, they are not well. They become disoriented and are unable to save themselves by either exiting the building or calling for assistance.


Table 1: CO Inhalation time (approx.) and symptoms

Concentration of CO in the air – PPM [1]



The maximum allowable concentration for continuous exposure in any 8-hour period according to Occupational Safety and Health Administration (OSHA) [2].


Slight headache after 1.5 hours.


Slight headache, fatigue, dizziness, nausea after 2-3 hours.


Frontal headaches within 1-2 hours, life threatening after 3 hours, also maximum parts per million in flue gas (on free air basis) according to US Environmental Protection Agency.


Dizziness, nausea and convulsions within 45 minutes. Unconsciousness within 2 hours. Death within 2-3 hours.


Headache, dizziness and nausea within 20 minutes. Death within 1 hour.


Headache, dizziness and nausea within 5-10 minutes. Death within 25-30 minutes.


Headache, dizziness and nausea within 1-2 minutes. Death within 10-15 minutes.


Death within 1-3 minutes.

[1] PPM – Parts per mission
[2] OSHA – Occupational Safety & Health Association


Table 2: ClareOne CO alarm response

CO gas level

Red light

Display icon (before sounder)

Display icon
(after sounder)


≈ 30 ppm





≈ 70 ppm

1 flash every 3 seconds

70 ppm - 1 70 ppm - 2

On within 60 to 240 minutes (typically 90 mins).

≈ 150 ppm

1 flash every 2 seconds

150 ppm -1 150 ppm -2

On withing 10 to 50 minutes (typically 30 minutes).

≈ 400 ppm

1 flash every second

400 ppm -1 400 ppm -2

On within 4 to 15 minutes (typically 9 minutes).

≈ 750 ppm

1 flash every second

750 ppm -1 750 ppm -2

On within 3 minutes (typically 2 minutes).

*Unless it has alarmed previously, ppm values shown in the table are for example purposes only. See “CO alarm memory”.

Alarm indicators

Co Present: Red LED flash only

Co Alarm: Red LED flash + sounder

Faults: Yellow LED Flash + beeps

CO present (before alarm sounds)

When the alarm detects CO the red LED flashes in accordance with Table 2. This helps locate CO leaks as the unit gives an immediate indication. (Without this feature the CO would need to be present for typically 90 minutes for an alarm sound to be given).

Note: The red LED flashes may be triggered by CO produced by gas appliances, from car engines or from nearby barbecues. This is usually not a concern, unless the red LED flashes persist until the alarm sounds and the CO source is unknown.

The display models display CO concentrations greater than 30ppm in accordance with Table 2.

Note: The CO alarm may sound if cigarette smoke is blown into it or if aerosols are released nearby.

CO alarm memory

The CO alarm memory is an important feature of the CO alarm. If the house is unoccupied during an alarm condition, it warns the homeowner that the unit has previously detected CO gas and been in alarm. The memory feature has two operation modes:

  • Memory indication for 24-hour period after alarm
  • Memory recall on demand

24-hour memory indicators: After alarm, the red LED flashes at different rates every 50 seconds depending on the level of CO detected - see Table 3.

Memory recall on demand: To review the memory status after initial 24 hours, press and hold the Test button, the red LED flashes in accordance to Table 3. Display models show the peak level of CO measured.

Reset Memory: Hold down the Test button until the red LED stops and the green LED starts flashing. Cover the Alarm with a cloth to muffle the sounder during this time.

Note: The memory is reset when the unit is switched off.

Table 3: CO alarm memory indicators

CO gas level

Red light response



On demand (button press)

≈ 70 ppm

1 flash every 50 seconds

1 flash

≈ 150 ppm

2 flashes every 50 seconds

2 flashes

≈ 400 ppm

4 flashes every 50 seconds

4 flashes

≈ 750 ppm

4 flashes every 50 seconds

4 flashes

CO alarm location


For your information the National Fire Protection Association’s Standard 720 advises as follows:

Carbon Monoxide Alarms shall be installed as follows:

  1. Outside of each separate dwelling unit sleeping area in the immediate vicinity of the bedroom.
  2. On every occupiable level of a dwelling unit, including basements but excluding attics and crawl spaces.
  3. Other locations where required by applicable laws, codes, or standards.

The equipment should be installed using wiring methods in accordance with the National Fire Protection Association’s Standard 72, 720. (National Fire Protection Association, Batterymarch Park, Quincy, MA 02269).

Note: Specific requirements for Carbon Monoxide alarm installation vary from state to state and from region to region. Check with your local Fire Department for current requirements in your area.

Recommended installation location

  • Every room containing a fuel burning appliance, and remote rooms where occupants spend a considerable amount of time
  • In every bedroom. If the number of Carbon Monoxide alarms to be fitted is limited, the following points should be considered when deciding where best to fit the alarm(s)
    • Place a CO alarm in the room if there is an appliance where people sleep.
    • Place a CO alarm in a room containing a flueless or open-flued appliance.
    • Place an alarm in a room where the occupant(s) spend most of their time (e.g. family room).
  • In a studio apartment, the CO alarm should be placed as far away from the cooking appliance as possible, but near where the person sleeps.
  • If the appliance is in a room not normally used, such as a furnace room, the CO alarm should be placed immediately outside the room so that the alarm is heard more easily.


Figure 1: Location of CO alarm in a room with a fuel burning appliance

fig 1

Figure 2: CO alarm in a room with sloped ceilings

fi 2

Note: The CO Alarm should be located at the high side of the room.


Figure 3: CO alarm in bedrooms and other rooms away from appliances (i.e. at breathing level)

fig 3

Poor installation placement

Do not place the CO alarm in any of the following areas.

  • In the immediate vicinity of a cooking appliance (keep it at least 3 ft (1 m) horizontally from it)
  • Outside the building
  • In an enclosed space (e.g. in or below a cupboard)
  • In a damp or humid area
  • Directly above a sink, stovetop, or oven
  • Next to a door, window, air vent or anywhere that it could be affected by draughts
  • Next to a ceiling or exhaust fan or air conditioning vents
  • Above heat sources such as radiators or heating vents
  • Where it would be obstructed, e.g. by curtains or furniture
  • In an area where the temperature could drop below 40°F (4.4°C) or rise above 100°F (37.8°C)
  • Where dirt or dust could block the sensor
  • Where it could be easily knocked/damaged, or where it could be accidentally turned off /removed
  • In a bathroom or other areas where the CO Alarm may be exposed to water splashes, dripping or condensation
  • Near paint, thinners, solvent fumes, or air fresheners

Using the CO alarm in a room with a fuel burning appliance

Note: See Figure 1 for a visual representation on CO alarm placement.

  • If it is mounted on a wall, it should be located at a height greater than the height of any door or window but still be at least 0.5 ft (150 mm) from the ceiling.
  • If it is mounted on the ceiling it should be at least 1 ft
    (300 mm) from any wall or light fixture.
  • The CO alarm should be a horizontal distance of between 5 ft to 10 ft (1.5 m and 3 m) from the potential CO source.
  • If there is a partition in the room, the CO alarm should be located on the same side of the partition as the potential source of carbon monoxide.
  • In rooms with sloped ceilings and fuel burning appliances, the CO alarm should be located at the high side of the room, see Figure 2.
    • If locating the CO alarm in a bedroom or in rooms remote from a fuel burning appliance, see Figure 3.
  • Mount the CO alarm relatively close to the breathing zone of the occupants.
  • Whatever position is selected make sure it is possible to view the three LED indicators when in the vicinity of the Alarm.

WARNING: A CO Alarm should not be used as a substitute for proper installation, use and maintenance of fuel-burning appliances, including appropriate ventilation and exhaust systems.

WARNING: Your CO alarm is intended for use in ordinary indoor locations of family units. It is not designed to measure compliance with OSHA commercial or industrial standards.


To add the sensor to your panel and for detailed programming instructions, refer to the ClareOne Wireless Security and Smart Home Panel User Manual (DOC ID 1871).

To add the alarm:

  1. Put the ClareOne panel in “add mode” and follow the displayed instructions for adding the sensor.
  2. Press the Test button.
    – Or –
    Twist the alarm’s body away from the base.
  3. Exit “add mode.”


    WARNING: The Installation of this apparatus should not be used as a substitute for proper installation, use and maintenance of fuel burning appliances including appropriate ventilation and exhaust systems.

    To install the CO alarm:

    1. Select a location, see CO alarm.
    2. Remove the mounting plate from the packaging.
    3. Place the mounting plate on the ceiling/wall in the desired mount position.
    4. Use a pencil and mark the location of the two screw holes.
    5. Taking care to avoid any electrical wiring in the ceiling, drill holes using a 13/64 in (5.0 mm) drill bit through the center of the marked locations.
    6. Push the plastic screw anchors provided into the drilled holes, and then screw the mounting plate to the ceiling/ wall.
      – Or –
      If desired, the CO alarm sets atop flat surfaces with the mounting plate attached.
    7. Carefully align the alarm with the base, gently pressing it into place, twisting it on the plate, connecting the batteries.
      The red, yellow, and green LEDs immediately flash in sequence to show the alarm is powered correctly. In addition, the icons on the LCD display on the display models also become visible.
    8. Wait 15 seconds, and then press the Test button.

      fig 5
    9. Install other alarms similarly.

      To tamperproof the alarm:

      1. Break off the small pillar on the base.

        fig 6
      2. To remove the alarm once installed, it is now necessary to use a small screwdriver, to release the catch (push catch towards the ceiling) and then twist off the alarm.

        fig 6b
      3. If necessary it is possible to further secure or tamperproof the alarm by using a No.2 or No.4 3/32 to 7/64 in (2 to 3 mm) diameter - not supplied self-tapping screw 1/4 to 5/16 in (6 to 8 mm) long to firmly lock the alarm and its mounting plate together.

        fig 7

      Testing the CO detector

      Test the system frequently to ensure its continued and safe operation.

      To test the detector: Press and hold the Test button.

      The green LED flashes and the sounder ramps up to full sound, indicating that the detector is operating correctly.

      Testing recommendations

      • Immediately after the system is installed or upgraded
      • Once weekly thereafter
      • After prolonged absence from the dwelling (e.g. after extended vacation)
      • After any significant home repairs or remodeling work

      Silencing (Hush)

      When the alarm sounds, after sensing CO, pressing the Test/Hush button immediately silences the alarm (the red LED continues to flash). If CO is still present the red LED and sounder activate again after 4 minutes. The alarm can only be silenced once during a CO incident. At levels > 250 ppm CO the alarm cannot be silenced.

      CO detector monitoring

      The CO alarm self-checks (monitors) itself and give a status update every 50 seconds if there are any problems.

      The status of the alarm can also be checked on demand by using the test button. Table 4 shows the status response to both the self-check and on demand testing.

      Note: If the alarms indicate a fault, pressing the Test button silences the beeps for a 24-hour period. This is for your convenience and can only be done once.

      Table 4: ClareOne CO monitoring summary

      Red LED

      Yellow LED (fault)

      Green LED (power)


      LCD display


      Standby - No visual or audible indication if unit is ok.

      Unit OK (button test)




      Ramp up to full sound

      o ppm 2


      Low battery


      1 flash


      1 beep

      low battery

      Replace batteries

      Sensor fault


      2 flashes


      2 beeps


      Replace unit

      End of life (EOL)


      3 flashes


      3 beeps


      Replace unit

      CO detector maintenance

      Clean the outside housing by occasionally wiping with a clean damp cloth. Do not use any cleaning agents, bleaches, detergents, or polishes including those in aerosol cans. Avoid spraying air fresheners, hair spray, paint, or other aerosols near the CO alarm. Do not place air fresheners near the unit.

      Use the narrow nozzle of a vacuum cleaner to remove dust and other contamination from the cover slots and gas entry holes.

      CAUTION:Do not paint the CO alarm.

      Remove the CO alarm when decorating. Do not allow water or dust to contaminate the alarm.

      WARNING: Do not open or tamper with the CO alarm. There are no user serviceable parts inside, and this can damage the alarm.

      Battery replacement

      If the alarm indicates a yellow flash with a single beep or the low battery icon is displayed on the LCD display, the battery needs attention.

      To replace the battery:

      1. Remove the alarm from the mounting plate.
      2. Remove the battery cover, and then remove the current batteries. Note the battery polarity.
      3. Insert new batteries, noting the polarity.
        Note: Use only Duracell Alkaline MN2400BK AAA size batteries (from a local retailer).
      4. Replace the battery cover.
      5. Carefully align the alarm on the base, and then gently press and twist on. This connects the batteries.
        The red, yellow, and green LEDs immediately flash in sequence to show the batteries are connected properly. In addition, the icons on the LCD display on the display models light up.
      6. Wait 15 seconds, and then press the Test button to ensure that the alarm works.


          • If the alarm still indicates a yellow flash with a single beep or the low battery icon is displayed on display alarms the batteries may be depleted. Replace them with fresh batteries.
          • If the red, yellow, and green LEDs do not flash in sequence and there is no display on the LCD display units, the batteries may be installed incorrectly (reverse polarity). Remove the Alarm from the mounting bracket, remove the battery cover and check if the batteries are installed correctly. If the batteries were connected incorrectly and after correcting the polarity of the batteries, for the first hour the alarm may indicate CO is present by a flashing red LED for non-display alarms; for display models the alarm may indicate CO level readings and/or random icons. Please note that during this period the alarm activates as required during an actual CO event.

        WARNING: Constant exposures to high/low temperatures or high humidity reduces battery life. Use only batteries specified in marking. Use of a different battery may have a detrimental effect on alarm operation.

        For environmentally sound disposal, remove the alarm from its mounting plate models, open the battery door and remove the batteries) and dispose in accordance with best practice and guidance on WEEE disposal and recycling.

        Functional gas test

        The Carbon Monoxide alarm checks for CO gas every 4 seconds. When exposed to the CO gas, the red LED flashes (as per Table 2) to confirm that it is detecting the CO gas. Solo C6 brand canned CO testing agent may be used to verify the alarm’s ability to sense CO.

        To gas test the CO detector: Spray canned CO within .25 in of the gas entry holes for 3 seconds.
        fig 9

        Within seconds, the red LED begins to flash (as per Table 2) confirming that the alarm has detected the CO.

        To enter accelerated functional gas test mode: Press the Test button momentarily (approximately 1 second) while the alarm is indicating CO presence.

        The alarm will sound 2 x 4 temporal tone patterns to indicate an alarm condition.

        To return the unit to standby:

        Place the alarm in clean air for a few minutes until the red LED is no longer flashing.


        When the alarm sounds

        WARNING: Actuation of your CO alarm indicates the presence of carbon monoxide (CO) which can cause death.

        Act immediately when the CO detector alarms.

        When the alarm sounds:

        1. Press Reset/Silence button (only operational at concentrations < 250ppm).
        2. Call your local Fire Department or 911.
        3. Immediately move to fresh air – outdoors or by an open door/window. Do a head count to ensure that all persons are accounted for. DO NOT re-enter the premises until the first responders have arrived, the premises have been aired out, and your alarm returns to its normal condition.
        4. After following steps 1-3, if your alarm reactivates within a 24-hour period, repeat steps 1-3 and call a qualified appliance technician to investigate for sources of CO from fuel burning equipment/appliances and inspect for proper operation of this equipment.

          If problems are identified during this inspection have the equipment serviced immediately. Note any combustion equipment not inspected by the technician and consult the manufactures’ instructions, or contact the manufacturers directly, for more information about CO safety and this equipment. Make sure that motor vehicles are not, and have not been, operating in an attached garage or adjacent to the residence.

          Note: When ventilation is provided by leaving the window and doors open, the CO build up may have dissipated by the time help arrives and the alarm may have stopped sounding. Although your problem may appear temporarily solved it is crucial that the source of the CO is determined, and appropriate repairs made.

        Protecting your family

        Follow these guidelines to reduce the risk of Carbon Monoxide poisoning.

        • Know and look out for warning signs that Carbon Monoxide may be present. These include:
          • The CO alarm warning of abnormal levels
          • Staining, soot marks or discoloration on or around appliances
          • A pilot light frequently going out
          • A strange smell when an appliance is operating
          • A gas flame which is yellow or orange, instead of the normal blue
          • Family members (including pets) exhibiting the “flu-like” symptoms of CO poisoning as described above. If any of these signs are present, get the appliance serviced before further use. If feeling ill, get immediate medical help.
        • Choose all appliances and vehicles which burn fossil fuels such as coal, oil, natural gas, propane, kerosene, wood, gasoline, diesel, charcoal, etc. with care and have them professionally installed and regularly maintained.
        • These appliances must “breathe in” air to burn the fuel properly. Know where the air comes from and ensure vents remain unobstructed (particularly after any construction or remodeling work).
        • The appliances must also “breathe out” waste gases (including the CO) – usually through a flue or chimney. Ensure chimneys and flues are not blocked or leaking and get them checked every year. Check for excessive rust or cracks on appliances and pipe work.
        • Never leave your car, motor bike or lawnmower engine running in the garage with the garage door closed. Never leave the door from the house to the garage open if the car is running.
        • Never adjust your own gas pilot lights.
        • Never use a gas stove, cooktop or a barbecue grill for home heating.
        • Children should be warned of the dangers of CO poisoning and instructed never to touch or interfere with CO alarms. Do not allow small children to press the Test/ Hush button as they could be subjected to excessive noise when the alarm sounds.
        • Leaving windows or doors slightly open (even a few inches) significantly reduces the risk of high levels of CO occurring. The high levels of draught-proofing in modern houses reduces ventilation and can allow dangerous gases to build up.
        • Install CO alarms in all the areas recommended in this booklet.
        • Recognize that CO poisoning may be the cause when family members suffer from “flu-like” symptoms when at home but feel better when they are away for extended periods.


        Compatible panel

        ClareOne (CLR-C1-PNL1)

        Transmitter frequency

        433 MHz



        Visual indicators

        Low battery, sensor fault, end of life

        Audible indicators

        Low battery, sensor fault, end of life

        Test/Hush button

        Checks the electronics, sounder, sensor, and batteries

        Audible alarm

        85 dB at 3 meters

        CO alarm memory

        Indicates if the unit was previously in alarm

        Battery type

        (2x) AAA (Alkaline)

        Battery life

        Should be changed annually (extreme temperatures affect battery life)

        Expected life span

        10 years

        Operating environment                Temperature               
        Humidity range

        40 to 100°F (4.5 to 38°C)
        15 to 95% R.H. noncondensing

        (W × H × D)

        4.72 × 4.13 × 1.77 in. (120 × 105 × 40 mm)


        FCC: 15.109 Class B 15.231, Industry Canada: ICES-003, RSS-210, conforms to UL-2034, CSA Std 6.19-01

        Servicing the CO detector

        If your CO alarm fails to work after you have carefully read all the instructions, verified that the unit has been installed correctly, and ensured that it has good batteries connected, return it for repair or replacement from the original purchasing location.

        Some states or jurisdictions do not allow the limitation or exclusion of incidental or consequential damages, or limitations on how long an implied warranty last so the above limitation may not apply to you.

        Do not interfere with the alarm or attempt to tamper with it. This will invalidate the guarantee, but more importantly may expose the user to shock or fire hazards. This guarantee is in addition to your statutory rights as a consumer.

        CO detector limitations

        The CO alarm will not work without good batteries or if the batteries are placed in reverse polarity. If the batteries have been drained the alarm will not give protection. Button test the alarm weekly and on return from vacations or other long absences.

        Carbon Monoxide must enter the unit for it to be detected. There may be Carbon Monoxide in other areas of the house (e.g. downstairs, in a closed room, etc.) but not in the vicinity of the CO alarm. Doors, air drafts and obstructions can prevent CO from reaching the alarm. For these reasons we recommend CO alarms are installed both near and in bedrooms, particularly if bedroom doors are closed at night. Additionally, install detectors in rooms where members of the household spend much of their time, and in rooms with potential sources of CO gas.

        The CO alarm may not be heard. The sound output is loud but it may not be heard behind a closed door or if it is too far away. The alarm may not wake up someone who is impaired by alcohol or medications. The alarm sound may be masked by other sounds such as T.V., stereo, traffic noise etc. Installing CO alarms on either side of closed doors will improve their chance of being heard. This CO alarm is not designed for people with impaired hearing.

        CO alarms don’t last indefinitely. CO alarms are sophisticated electronic devices with many parts. Although CO alarms and their component parts have undergone stringent testing, and are designed to be very reliable, it is possible that parts can fail. Therefore, you should test your CO alarms weekly. CO Alarms must be replaced after 10 years of operation.

        CO alarms are not a substitute for life insurance. Householders are responsible for their own insurance. CO alarms warn of increasing CO levels, but we do not guarantee that this will protect everyone from CO poisoning.

        CO alarms are not suitable as early warning smoke alarms. Some fires produce Carbon Monoxide, but the response characteristics of these CO alarms are such that they would not give sufficient warning of fire. Smoke alarms must be fitted to give early warning of fire.

        CO alarms do not detect the presence of natural gas (methane), propane, butane, or other combustible gases. Install combustible gas alarms to detect such gases.

        Note: Carbon Monoxide alarms, with electrochemical sensors have a cross sensitivity to hydrogen. This means that they can alarm due to sensing hydrogen produced by batteries which are incorrectly charged, such as on boats or with battery back-up systems such as those used with alternative energy systems. The unit will alarm with 500ppm H2 after between 10- and 40-minutes exposure.

        This CO alarm is intended for residential use. It is not intended for the use in industrial applications where OSHA requirements for carbon monoxide detectors must be met.

        This carbon monoxide alarming device is designed to detect carbon monoxide gas from any source of combustion. It is not designed to detect smoke, fire, or any other gases.



        The alarm does not work with the test button

        1. Wait 15 seconds after connecting the power before button testing.
        2. Hold button down firmly for at least 5 seconds.
        3. Check the alarm is secured correctly on the mounting plate.
        4. Check if batteries are inserted in the correct polarity.
        5. Replace batteries.

        Alarm sounds for no reason

        See When the alarm sounds.

        If there are still problems:

        1. Ensure there are no fuel burning appliances in the vicinity which could be leaking CO gas (e.g. even from next door).
        2. Ensure there are no fumes in the area (e.g. paint, thinners, hair spray, chemical cleaners aerosol sprays, damp proofing done with and aqueous emulsion such as amino functional siloxane and alkylalkoxysilane.
        3. Ensure there is no outdoor source of CO in the vicinity (e.g. a car with engine running, heavy traffic, heavy air pollution, barbecue fumes, etc.).
        4. Ensure there is no source of hydrogen such as batteries being charged (e.g. on boats or in Uninterruptable Power Supplies (UPS)).
        5. Ensure there is not excessive smoke or fumes from devices such as Egyptian shisha or hookah pipes, especially those that use coal or charcoal to heat the tobacco.
        6. If the alarm is installed with an RF Module, ensure that there are no problems with the other RF interconnected devices.
        7. Press the Test/Hush button to silence the alarm.

        If the unit continues to sound it is possibly defective and should be replaced.

        Display and indicator summary


        Sensor Fault

        o ppm 2 low battery sensor fault
        Evacuation Status


        evac status

        sensor fault


        Table 5: ClareOne CO indicator summary


        Red LEDs

        Yellow LEDs

        Green LEDs


        Normal operation

        Power up

        1 flash

        1 flash

        1 flash







        Button test (weekly)



        Flashing (every second)

        Temporal full sound

        Unit sensing CO has itself

        Flashing (as per table 2)



        Temporal full sound

        Sensing CO through RF interconnect




        Temporal full sound

        Fault mode

        Low battery condition


        1 flash (every50 seconds)


        1 beep with flash

        Sensor fault condition


        2 flashes (every 50 seconds)


        2 beeps with flash

        End of life condition


        3 flashes (every 50 seconds)


        3 beeps with flash


        Table 6: ClareOne CO service diagnostics

        Diagnostic modes


        Red LED

        Yellow LED



        Fault checks

        Low battery

        Press and hold button

        1 flash

        1 flash



        Faulty sensors

        Press and hold button





        End of Life

        Press and hold button



        Temporal full sound


        Alarm memory


        Red LED

        Green LED


        LCD display

        24 hours after event


        Flashers per table 3




        Long term memory

        Press and hold button

        Flashers per table 3


        Temporal full sound

        CO ppm

        Memory erase

        Keep button pressed after long term test

        Flashers per table 3

        Wait for green light then release button

        Temporal full sound

        CO ppm


        Full PDF - ClareOne Carbon Monoxide Installation Sheet (DOC ID 1942)