120
GB
table of error codes
ERROR DESCRIPTION
917
Freeze error, LWT and/or TR too low.
Service reset to remove fault
9 18 Pump Down Error
9 19 HIGH SDT Error
9 20 HC Probes Error
9 21 Error Electricity/Gas Cost ratio
9 22 Freeze Error
9 23 Heating Circuit pressure Error
9 24 Communication error
9 25 Boiler not present
9 30 EM NO Circulation Error
9 31 INVERTER Error
9 33 Overheat
9 34 DHW Tank sensor damaged
9 35 Tank overtemperature
9 36 Floor Thermostat 1 error
9 37 No circulation error
9 38 Anode Fault
9 39 HP error
9 40 Hydraulic scheme not defi ned
9 41 Night tariff contact not defi ned
9 42 Load shedding contact not defi ned
9 44 Cooling overtemperature
9 45 Flow switch stuck
9 46 HP compressor error
9 47 4-way valve error
9 48 TD sensor error
9 49 TS sensor error
950
TD overtemperature.Service reset to
remove fault
951
TD overtemperature error
952
TO sensor error
953
Compressor heater mismatch error
954
Base panel heater mismatch error
955
Water Flow Check Error
957
HP Fan model mismatch
Restoring operation
If the system shuts down, a code will appear
on the system interface display signalling the
type of shutdown and the reason behind it.
To restore normal operation, follow the in-
structions provided on the display or, if the
error persists, contact an authorised Techni-
cal Service Centre for assistance.
(*) BUS power supply overload
A BUS power supply overload error may oc-
cur due to the connection of three or more
devices within the installed system. Devices
which may overload the BUS network in-
clude:
- Multizone module
- Solar pump assembly
- Module for instant production of domes-
tic hot water
To avoid overloading the BUS power supply,
set microswitch 1 on one of the P.C.B.s in-
side the equipment connected to the system
(except the boiler) to OFF, as illustrated in
the fi gure.
1
ON
OFF
2
microswitch
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