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36. Troubleshooting warning messages
Number Fault
Description
Cause and remedy
1
BCU replaced
The control PCB has detected that the burner
control unit has been replaced
Insert boiler chip card that
corresponds to appliance output; if
necessary, reinsert boiler chip card
2
HC pressure
The water pressure has fallen below the
warning limit
Check the system pressure,
test sensors
3
Parameter changed
Another boiler chip card has been inserted
Make sure that the correct boiler
chip card has been inserted, if
necessary, reinsert boiler chip card
4
No flame
At the last attempt to start the burner, no
flame was detected
Wait for another start attempt,
test ignition electrode and ignition
transformer, test monitoring
electrode, test gas connection
pressure
5
Flame failure during
stabilisation time
Flame failure after safety time
Flame failure during operation
Monitoring electrode faulty, flue
gas path blocked, condensate
drain blocked, test gas connection
pressure
24
Speed below or above limit
The fan does not reach the set speed, or
does not stop
Test flue system, test the fan's PWM
and power cable
43
Many burner starts
Number of burner starts too high
Too little heat is being drawn off, too
little throughput, demand too high
Warning messages
The following warnings are in the system: