Nibe HBS 05 Series - Alarm List and Error Code Diagnostics; Sensor Fault Alarms (BT3, BT12, BT15); Condenser Temperature Alarms; High Pressure (HP) and Low Pressure (LP) Alarms

May be due toDescriptionAlarm text on the dis-
play
Alarm
■
Open circuit or short circuit on sensor
input
■
Sensor does not work (see section
"Troubleshooting")
■
Defective control board AA23 in HBS 05
Sensor fault, Sensor incoming water in
HBS 05 (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 HBS 05
Sensor fault, Sensor outgoing water in
HBS 05 (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 HBS 05
Sensor fault, Sensor fluid pipe in HBS 05
(BT15).
Sensor fault BT1515
■
Low flow during heating operation
■
Too high set temperatures
Too high temperature out from the con-
denser. 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 de-
frosting 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 AMS 10
■
Low or no flow during heating opera-
tion
■
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 (LPT)
■
Defective control board in AMS 10
■
Open circuit or short circuit on input for
suction gas sensor (Tho-S)
■
Defective suction gas sensor (Tho-S)
Too low a value on the low pressure
sensor (LPT) 3 times within 60 minutes.
LP alarm221
■
Any circuit breakers for AMS 10 off
■
Incorrect cable routing
Communication between the control
board and the communication board is
interrupted. There must be 22 volt direct
current (DC) at the switch CNW2 on the
control board (PWB1).
OU Com. error223
37Chapter 9 | Alarm listHBS 05
9 Alarm list