21
TROUBLESHOOTING
The carbon monoxide alarms do
not sound when the test button on
the NoCO Control Unit is pressed
• The CO alarms may not be wirelessly interlinked to the NoCO Control Unit.
Please contact your Gas Safe registered installer.
The Alarm LED (red) is ashing
• If the red LED is ashing every second and the carbon monoxide alarms are
sounding, the system is in alarm mode, warning of a carbon monoxide (CO) leak,
and the boiler will be shut off.
• Contact your Gas Safe registered installer to arrange for your boiler to be reset.
Ensure all fuel burning appliances are checked and serviced.
The Fault LED (yellow) is
illuminated and the alarm is
making a “chirping” sound
• If the yellow LED is ashing once per minute and at around the same time as the
chirp, this indicates a low battery condition and the alarm should be replaced as
soon as possible and certainly within 30 days. See low battery silence (page 22).
• If the yellow LED is ashing once per minute but at a different time to the chirp,
this indicates a fault and the alarm should be replaced as soon as possible.
• If the yellow LED is double ashing and the alarm is making a “chirping” sound,
this indicates that the wireless module has a low battery condition, or is faulty.
The alarm should be replaced as soon as possible.
• In all instances where the Fault LED (yellow) is illuminated, please call your Gas
Safe registered installer.
The boiler is switched off and the
Alarm LED (red) is ashing
• A carbon monoxide leak has been detected. Keep calm and open the doors and
windows to ventilate the property.
• Stop using all fuel burning appliances and ensure, if possible, that they are
turned off.
• Evacuate the property leaving the doors and windows open.
• Contact your gas or other fuel supplier on their emergency number.
• Remember, your boiler will switch off if the interlinked carbon monoxide alarms
detect carbon monoxide. However, it may be another fuel burning appliance
causing the carbon monoxide leak, so ensure all fuel burning appliances are
checked and serviced.