May be due toDescriptionAlarm text on the displayAlarm
• Open circuit or short circuit on sensor
input
• Sensor does not work (see section "Dis-
turbances in comfort")
• Defective control board AA23 in F2040
Sensor fault, Sensor incoming water in
F2040 (BT3).
Sensor fault BT33
• Open circuit or short circuit on sensor
input
• Sensor does not work (see section "Dis-
turbances in comfort")
• Defective control board AA23 in F2040
Sensor fault, Sensor outgoing water in
F2040 (BT12).
Sensor fault BT1212
• Open circuit or short circuit on sensor
input
• Sensor does not work (see section "Dis-
turbances in comfort")
• Defective control board AA23 in F2040
Sensor fault, Sensor fluid pipe in F2040
(BT15).
Sensor fault BT1515
• Low flow during heating operation
• Too high set temperatures
Too high temperature out from the condens-
er. Self-resetting.
High condenser out162
• Temperature generated by another heat
source
Too high temperature into the condenser.
Self-resetting.
High condenser in163
• Set when the heat pump runs the defrost-
ing procedure
Not an alarm, but an operating status.Defrosting in progress183
• Insufficient air circulation or blocked heat
exchanger
• Open circuit or short circuit on input for
high pressure switch (63H1)
• Defective high pressure switch
• Expansion valve not correctly connected
• Service valve closed
• Defective control board in F2040
• Low or no flow during heating operation
• Defective circulation pump
• Defective fuse, F(4A)
The high pressure switch (63H1) deployed
5 times within 60 minutes or for 60 minutes
continuously.
HP alarm220
• Open circuit or short circuit on input for
low pressure sensor
• Defective low pressure sensor
• Defective control board in F2040
• Open circuit or short circuit on input for
suction gas sensor (Tho-S)
• Defective suction gas sensor (Tho-S)
Too low value on the low pressure sensor
3 times within 60 minutes.
LP alarm221
NIBE F2040Chapter 10 | Alarm list56
10 Alarm list
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