65
57
System characteristics
Normal operation without room influence
Cause
Lead break, room temperature sensor
Measures
■
Check commissioning setting of remote control.
■
Check plug and cable of external room temperature
sensor, heating circuit.
■
If no external room temperature sensor installed,
replace programming unit.
58
System characteristics
Normal operation without room influence
Cause
Short circuit, room temperature sensor
Measures
Check plug and cable of external room temperature
sensor, heating circuit.
If no external room temperature sensor installed,
replace programming unit.
59
System characteristics
Burner locked out, boiler circuit pump off. No central
heating, no DHW heating
Cause
Power supply, undervoltage
Measures
Check mains voltage.
If voltage is correct and the fault occurs repeatedly,
replace the fan unit.
62
System characteristics
Burner in a fault state
Cause
High limit safety cut-out has responded.
Measures
■
Check heating system fill level.
■
Check pre-charge pressure in diaphragm expansion
vessel. Adjust to required system pressure.
■
Check whether flow rate is sufficient (circulation
pump).
■
Check function of 3-way diverter valve. Vent the sys-
tem.
Reset the appliance.
63
System characteristics
Burner in a fault state
Cause
Flue gas temperature limiter has responded.
Measures
■
Check heating system fill level.
■
Check pre-charge pressure in diaphragm expansion
vessel. Adjust to required system pressure.
■
Check whether flow rate is sufficient (circulation
pump).
■
Check function of 3-way diverter valve.
Troubleshooting
Fault messages (cont.)
6221465
Diagnosis
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