May be due toHeat pump action.CauseAlarm text on
the display
Alarm
no.
See relevant manual.Compressor blocked.See relevant manual.Low pressure
alarm.
221
See relevant manual.Compressor blocked.See relevant manual.Motor protec-
tion alarm.
222
See relevant manual.Compressor blocked.See relevant manual.Sensor fault.223
See relevant manual.Compressor blocked.See relevant manual.Fan alarm.224
See relevant manual.Compressor blocked.See relevant manual.Supply/return
line.
225
See relevant manual.Compressor blocked.See relevant manual.Sensor fault.227
See relevant manual.Compressor blocked.See relevant manual.Defrosting fault.228
See relevant manual.Compressor blocked.See relevant manual.Short operating
time.
229
See relevant manual.Compressor blocked.See relevant manual.Hot gas alarm.230
See relevant manual.Compressor blocked.See relevant manual.Phase sequence
fault.
231
See relevant manual.Compressor blocked.See relevant manual.Low evapora-
tion.
232
See IHB SMS40 for fault tracing.Accessory is blocked.Communication with the ac-
cessory card missing for 15
secs.
Communication
fault ACC
SMS40.
250
See IHB Modbus40 for fault
tracing.
Accessory is blocked.Communication with the ac-
cessory card missing for 15
secs.
Communication
fault ACC Mod-
bus40.
251
Faulty communication cableCompressor blocked.Communication with heat
pump missing.
Slave heat pump
1 comm fault.
252
See relevant manual.Compressor blocked.High VVX temp (E35)This alarm is
generated by
the heat pump
261
See relevant manual.Compressor blocked.Inverter fault, high temperat-
ure.
This alarm is
generated by
the heat pump
262
See relevant manual.Compressor blocked.Inverter error, high current
(E47)
This alarm is
generated by
the heat pump
263
See relevant manual.Compressor blocked.inverter error, com (E45)This alarm is
generated by
the heat pump
264
See relevant manual.Compressor blocked.inverter fault, pcb (E46)This alarm is
generated by
the heat pump
265
17Chapter 6 | TroubleshootingNIBE™ VVM 500
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