Honeywell NOTIFIER INSPIRE E10 Commissioning Instructions page 36

Messages and their Meanings
Message
CO SENSOR FAULT
CO SENSOR LIFE EXPIRED
DRIFT LIMIT REACHED
FREEZE ALERT
HEAT SENSOR FAULT
IR AMBIENT LIGHT FAIL
IR FAULT
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Meaning and possible remedial action.
If a fault persists then seek advice. Any remedial action requiring wiring
or replacement of parts, this work must be done by a trained engineer.
CO sensor fault detected.
Action: Replace the device.
CO sensor life has expired. So, this is a sensor
maintenance alert. The Carbon Monoxide (CO) element
of a SMART 4 multi-criteria sensor has reached its
expiry time.
Action: Replace the device.
A maintenance indication of a dirty sensor
approaching the limit of its operability.
Action: Replace the device.
Device is operating below it's recommended operating
parameters.
Action: TBA.
Heat sensor fault detected.
Action: Check and Replace the device.
The sensor is dirty or located where too much ambient
light is penetrating the sensor's detection chamber.
Action: Replace or change to an alternative sensor
type.
IR sensor fault has been detected.
Action: Replace the device.