May be due toDescription existing alarmAlarm text on the display(Alarm)Alarm
Poor flow.5 repeated low low-pressure sensor
alarm within 4 hours.
Low lp cooling80156
Fan blocked or not connected.5 unsuccessful start attempt.Fan alarm from heat pump182224
Connection, supply line return line
switched around,
Return is hotter than flow.Exchange Sensors
flow / return
8225
Open-circuit or short-circuit on sensor
input.
Sensor fault BT3.
Sensor fault BT12.
Sensor fault from heat
pump
34
36
227
Sensor fault BT14.38
Sensor fault BT15.40
Sensor fault BT16.42
Sensor fault BT17.44
Sensor fault BT28.46
Sensor fault BT81.48
Sensor fault BP8.50
Sensor fault BP9.52
Sensor fault BP11.54
Sensor fault BT84.56
System temperature and/or flow too
low.
Defrosting could not be completed 10
times in a row.
Unsuccessful defrosting2228
Poor flow, poor heat transfer.Operation is stopped from the indoor
section after less than 5 minutes.
Short run times for com-
pressor
4229
Refrigerant leakage.3 repeated high discharge sensor
alarm within 4 hours.
Hot gas alarm78230
Refrigerant leakage, blocked expan-
sion valve.
5 repeated low evaporation sensor
alarm within 4 hours.
Low evaporation temp76232
Inverter unpowered or broken.5 communication fault with inverter.Communication fault with
Inverter.
204264
Poor airflow, because of leaves, dirt,
snow or ice.
10 repeated defrostings according to
the protection conditions.
Recurring safety defrost-
ing
6341
Refrigerant leakage, blocked expan-
sion valve.
5 repeated low pressure alarm within
4 hours.
Recurring low pressure72344
Stop the heating medium flow, poor
system pressure, blocked expansion
valve.
5 repeated high pressure alarm within
4 hours.
Recurring high pressure74346
Initiation fault inverter.Unspecified faults207400
Incorrect inverter size.Inverter not compatible.209
Configuration file missing.211
Charge error configuration.213
Communication with AA2-X20 interrup-
ted.
3 repeated communication errors
within 2 hours.
Inverter alarm type II104421
41Chapter 9 | Alarm listNIBE F2120
9 Alarm list
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