Troubleshooting
38
Diagnosis (continued)
Diagnostics table: Faults without fault display on control unit
System behavior
Cause of fault Corrective action
Supply temperature too cold or too warm. Fuse Check fuse (see page 43).
Variable speed heating circuit
pump
Check coding of heating circuit
pump (see page 52).
Heating system t ype incorrectly
coded
Check coding of heating
system type (see page 49).
Room temperature too cold or too warm. Thermostatic radiator valves Check thermostatic radiator
valves (see page 43).
Domestic hot water temperature too cold or too
warm.
Circulating pump Check circulating pump.
Boiler constantly switches on and off. Flue gas system leaking Check flue gas system for leaks
and perform leak test.
Diagnostics table: Faults on power module
System behavior
Cause of fault Corrective action
Boiler has no power Main power on/off switch Check switch position
(main power on/off switch on boiler is in ”ON”
position)
Power supply or boiler is not
electrically connected
Ensure that power cord and
power supply cable to the boiler
are plugged in properly.
Fuse F1
(located in the Power/Pump
Module)
Replace fuse with same type and
of same rating (T2A/250 V, slow
blow)
Heating pump does not operate
Electrical connection(s) has/have
been made incorrectly.
Ensure that
– connections , , and
on the mother board
– connections ..., , and
in the boiler junction box
are made correctly.
20A
20A
Fuse F2A
(located in the Power/Pump
Module)
Replace fuse with the same type
and of same rating (T10A/250 V,
slow blow)
5285 961 v1.3
To Next Page
Loading...
