Repairers actionHeat pump action.CauseAlarm text on
the display
Alarm
no.
Check communication
cables.
Accessory is blocked.Communication with the
accessory board has been
missing for 15 seconds.
Perm. com. fault
(accessory)
73-95
Check the setting of the dip
switch.
Check communication
cables.
Room unit is blocked.Communication with the
room unit has been missing
for 15 seconds.
Perm. com. error
(room unit)
96-99
Communication with the
climate system has been
missing for 15 seconds.
Perm. com. fault
(Climate system
5-8)
130–133
Fans are switched off. Automat-
ic reset when BT1 and BT23 >
+3°C
Anti-freeze supply air.Anti freeze alarm
supply air
185
Manual resetCommunication with the
accessory has been missing
for 15 seconds.
Com. fault with
HW comfort
206
Accessory blocked.Sensor not connected/de-
fective
Sensor fault AZ2-
BT20 - FLM2
236
The input for the sensor receives
unreasonably high or low value
for longer than 2 seconds.
(exhaust air)
Accessory blocked.Sensor not connected/de-
fective
Sensor fault AZ2-
BT21 - FLM2
237
The input for the sensor receives
unreasonably high or low value
for longer than 2 seconds.
(extract air)
Accessory blocked.Sensor not connected/de-
fective
Sensor fault AZ2-
BT26 - FLM2
238
The input for the sensor receives
unreasonably high or low value
for longer than 2 seconds.
(collector in)
Accessory blocked.Sensor not connected/de-
fective
Sensor fault AZ2-
BT26 - FLM3
239
The input for the sensor receives
unreasonably high or low value
for longer than 2 seconds.
(collector in)
Accessory blocked.Sensor not connected/de-
fective
Sensor fault AZ2-
BT26 - FLM3
240
The input for the sensor receives
unreasonably high or low value
for longer than 2 seconds.
(collector in)
Accessory blocked.Sensor not connected/de-
fective
Sensor fault AZ2-
BT26 - FLM3
241
The input for the sensor receives
unreasonably high or low value
for longer than 2 seconds.
(collector in)
F1245Chapter 6 | Troubleshooting30
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