Alarm 241 – The negative pressure sensor is defective!
Safety shutdown! The negative pressure in the combustion chamber is defective and continu-
ously indicates 1 mbar.
4
Notify customer service.
Alarm 242 – The oxygen sensor is missing or is defective!
The oxygen sensor (lambda probe) is missing or is defective!
The system will be switched off.
4
Notify customer service.
Alarm 244 – Calibration error of the lambda probe
The control module could not read a valid calibration factor.
The system will be switched off.
4
Notify customer service.
Alarm 246 – No flame detectable
The photocell does not detect any flame.
4
Is the pipe or the photocell blocked?
4
Has the ash transport system failed?
4
If the fault occurs regularly, please notify customer service.
Alarm 248 – The maintenance interval has elapsed.
This reminder is triggered after a freely-selectable number of full-load hours. The interval starts
over again after changes to the interval time and the "Number of maintenance procedures", in
the Customer service [► 39
] menu.
The alarm triggers an SMS, however, the system remains in operation.
This interval is deactivated in the factory setting.
Alarm 249 – The chimney sweep function is active
In the status, all consumers run with full load.
The rocker switch "Measuring mode" was operated
4
This status is automatically ended if the afterrun time of the chimney sweep function is
ended – and CANNOT be prematurely ended!
Alarm 250 – PCB revision and system number are not
compatible
The system will be switched off.
Compatibility problem between board and system
4
Notify customer service.
8.2.38
8.2.39
8.2.40
8.2.41
8.2.42
8.2.43
8.2.44
8
Troubleshooting
The alarm list
60
B KWB Easyfire EN, 05.2011
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