59
Alarm Screen
Possible Cause(s)
Suggested Action(s)
Action By
User
Engineer
Air is trapped in the heating system
creating steam inside the top of the heat
exchanger. Common with new installations.
The flow temperature sensor is faulty or
disconnected.
Remove all trapped air from the heating system
paying particular attention to the appliance
itself.
Test the operation of the flow temperature
sensor and re-connect/replace if necessary.
The return temperature sensor is faulty or
disconnected.
Test the operation of the return temperature
sensor and re-connect/replace if necessary.
The flue gas temperature sensor is faulty or
disconnected.
Test the operation of the flue gas temperature
sensor and re-connect/replace if necessary.
The lambda sensor (oxygen sensor) is
faulty or disconnected.
Test the operation of the lambda sensor and re-
connect/replace if necessary.
Table 11: Alarms Schedule 3
