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