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54
Fault code dis-
played
System characteristics
Cause
Measures
63
No heating system control,
heating circuit 3
Lead break, flow tempera-
ture sensor, heating circuit
3
Check flow temperature sensor,
heating circuit 3.
64
No DHW heating
Lead break, cylinder tem-
perature sensor
Check cylinder temperature sen-
sor.
65
No flow control, DHW heating Lead break, return tem-
perature sensor, DHW
heating
Check return temperature sensor,
DHW heating.
90
Burner blocked
■
Fuel too damp
■
Lambda probe inaccu-
rate
■
Logs poorly charged
■
Use suitable dry fuel
■
Recalibrate Lambda probe
■
Acknowledge with OK
91
Boiler running with fixed air
damper setting
■
Lambda probe heavily
contaminated
■
Lambda probe faulty
■
Electronics fault
■
Recalibrate Lambda probe
■
Acknowledge with OK
Troubleshooting
Fault display
(cont.)
5684984
Diagnosis