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checking circuit has detected a fault. Press and hold the Test/Hush button. If the amber light flashes
without the horn sounding, the sensor is faulty. On the Ei261DENRC the display will show SF indicating
Sensor Faulty.
4. If the Alarm fails to operate when the Test/Hush button is pressed, switch off the mains supply at the
distribution fuse board and remove unit from mounting plate for 3 minutes. Put unit back on mounting
plate. Reconnect the mains and test again. (This procedure resets the microprocessor in the unit).
5. If the unit beeps every 40 seconds (without a light flash) it means the battery is depleted. (On the
Ei261DENRC with depleted cells, the display will show CP to remind you to Connect mains Power).
Connect mains power (ensure green light is on) to allow cells to charge.
6. Once a year check the rechargeable battery by switching off the mains supply and pressing the Test
/Hush button for 10 seconds. The horn should sound loudly. Reconnect the mains supply.
If the CO Alarm fails any of the above tests it must be replaced immediately (see 9 “GETTING YOUR CO
ALARM SERVICED” on page 27).
TESTING WITH CARBON MONOXIDE
The unit checks for CO every 4 seconds and as soon as it detects CO, it flashes the red light (as per
Table B on page 8) to confirm that is detecting CO gas.
Alternatively:
Pressing the Test/Hush button causes the unit to check for CO - this is the Fast CO Test Mode. This eliminates
the long wait normally required (e.g. up to 90 minutes at 55ppm CO and up to 3 minutes at 330ppm CO).
The unit can be tested with CO by using one of the kits that comes with CO either in a glass phial or
aerosol can. Follow the instructions on the kit but be sure to press the Test/Hush button to speed up the
CO sampling directly after you expose the unit to the CO. It is best if possible to inject the CO gas into
the gas entry holes (see Figure 1). When it senses the CO it will give 3 beeps and the red light will flash
as per Table B. It then automatically resets to normal mode. (If unit fails to respond, press the Test/Hush
button again as gas can take some seconds to enter sensor).
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