Repairers actionHeat pump action.CauseAlarm text on
the display
Alarm
no.
Accessory blocked.Sensor not connected/de-
fective
Sensor fault AZ2-
BT26 - FLM4
242
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 - FLM4
243
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 - FLM4
244
The input for the sensor receives
unreasonably high or low value
for longer than 2 seconds.
(collector in)
Accessory blocked.Communication with the
accessory has been missing
for 15 seconds.
Com. fault SMS250
Manual reset.
Accessory blocked.Communication with the
accessory has been missing
for 15 seconds.
Com. fault Mod-
bus
251
Manual reset.
Accessory blocked.Communication with the
accessory has been missing
for 15 seconds.
Com. fault
ACS45
257
Manual reset
Accessory blocked.The input for the sensor re-
ceives unreasonably high or
low value for longer than 2
seconds.
Sensor fault
EQ1-BT57
258
Manual reset
Accessory blocked.The input for the sensor re-
ceives unreasonably high or
low value for longer than 2
seconds.
Sensor fault
EQ1-BT75
259
Manual reset
Supply and exhaust air fan
switched off and QN40 opened.
BT21 < 0°C for 10 minutesLow extract air
temp.
293
Manual reset.
Manual resetNo communication with
FTX.
Com. fault with
FTX
297
Compressor blocked at relevant
slave, manual resetting of relev-
ant slave.
Communication with the
slave has been missing for
15 seconds.
Communication
fault with slave
1-8
301–308
(Alarm at slave level facilitates
logging)
Compressor blocked at relevant
slave, manual resetting of relev-
ant slave.
Alarm from the slave has
been detected.
Slave alarm from
slave 1-8
311–318
(Alarm at slave level facilitates
logging)
31Chapter 6 | TroubleshootingF1245
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