71
Type
No. Fault
Solution
ALL
89
Unstable com-
bustion feedback
signal error
- Check electrode
- Check outlets
- Check air diaphragm (for BF
models)
- Check gas calibration
ALL
90
Combustion set
cannot be reached
error
- Check electrode
- Check outlets
- Check air diaphragm (for BF
models)
- Check gas calibration
ALL
92
System has
reached maximum
air correction
error (at the mini-
mum flow rate)
- Check electrode
- Check outlets
- Check air diaphragm (for BF
models)
- Check gas calibration
ALL
93
Combustion set
cannot be reached
error
- Check electrode
- Check outlets
- Check air diaphragm (for BF
models)
- Check gas calibration
ALL
95
Flame signal mi-
cro interruptions
error
- Check electrode
- Check board
- Check electric power supply
- Check gas calibration
ALL
96
Lockout due to
flue (exhaust)
blockage
- Check for blockage in flue
- Check the smoke outlet and
electrode position (not touching
the burner)
ALL
98 SW error, board
start-up
- Contact the Technical Assis-
tance Centre
ALL
99 General board
error
- Contact the Technical Assis-
tance Centre
-
-
Frequent relief
valve intervention
- Check circuit pressure
- Check expansion vessel
-
-
Limited production
of domestic hot
water
- Check the diverter valve
- Check that plate heat exchang-
er is clean
- Check domestic hot water
circuit valve
Heat pump fault
Type
No.
Description
Solution
P
02
High pressure
Automatic reset
Remove and reconnect
the electrical power
supply
P
04
Low pressure
Automatic reset
Remove and reconnect
the electrical power
supply
P
12
Antifreeze (heat ex-
changer temp. < 3°C)
Wait for heat exchanger
temp. > 5°C
P
15
High temperature (HP
delivery temp. > 50°C)
Automatic restore when
delivery temp. < 48°C
P
32
Probe errors aggregate
(one or more probes with
an active alarm)
Automatic restore after
sensor replaced
P
33
Battery temperature
probe error
Replace the damaged
probe
P
34
Inlet water temperature
probe error
Replace the damaged
probe
P
35
Outlet water tempera-
ture probe error
Replace the damaged
probe
