Alarm list
Acknowledging alarms
No harm in acknowledging an alarm. If the cause of the
alarm remains, the alarm recurs.
■
Alarm codes are displayed in the connected indoor
unit, see alarm list for connected indoor unit.
NOTE
Recurring alarms mean that there is a fault in
the installation.
F2120-Alarm
The following alarm blocks the outdoor unit. The additional heat is controlled by the indoor module/control module
so that the min. permitted supply temperature is achieved.
In the event of an alarm in the outdoor unit, a red lamp with the text “Error” will light on the base board, see image
above the base board on page 15.
May be due toDescriptionText in displayAlarm,
outdoor
unit
Alarm, in-
door unit
Low flowLow pressure alarm 5 times within
4 hours.
Low LP cooling opera-
tion
80156
- The fan cannot spin freely or is not
connected.
Deviations in the fan speed in
F2120.
Fan alarm182224
-Flow/Return in wrong direction.The return is higher than the supply
temperature.
Flow/Return8225
-The sensors are incorrectly placed.
-Open circuit or short circuit on
sensor input
Sensor fault BT3
Sensor fault BT12
Sensor fault34
36
227
Sensor fault BT1438
Sensor fault BT1540
Sensor fault BT1642
Sensor fault BT1744
Sensor fault BT2846
Sensor fault BT8148
Sensor fault BP850
Sensor fault BP952
Sensor fault BP1154
Sensor fault BT8456
System temperature and/or flow
too low, external wind effect,
problem in cooling circuit
Defrosting could not be completed
10 times in a row.
Defrosting fault2228
Flow problem or incorrect settings
HWM/SMO
Compressor operation has been
shorter than 5 minutes 3 times in a
row.
Short operation time4229
- Sensor does not work (see "Tem-
perature sensor" section)
High hot gas alarm 3 times in a row
within 4 hours.
Permanent Hotgas78230
- Insufficient air circulation or
blocked heat exchanger
- Refrigerant leak
- Defective compressor
- External wind effectLow evaporation temperature 5
times in 4 hours.
Low evaporation76232
- Defective evaporation sensor
- Refrigerant leak
- Defective expansion valve
F2120Chapter 5 | Troubleshooting22
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