Nibe HBS 05 Series - Fan and Communication Error Alarms; Heat Exchanger and Refrigerant Alarms

May be due toDescriptionAlarm text on the dis-
play
Alarm
■
The fan cannot rotate freely
■
Defective control board in AMS 10
■
Defective fan motor
■
Control board in AMS 10 dirty
■
Fuse (F2) blown
Deviations in the fan speed in AMS 10.Fan alarm224
■
Sensor does not work. (An ambient
temperature sensor BT28 (Tho-A) is
located on the rear of AMS 10)
■
Insufficient air circulation or heat ex-
changer
■
Blocked
■
If the fault persists during cooling, there
may be an insufficient amount of refri-
gerant.
■
Defective control board in AMS 10
Temperature deviation on the hot gas
sensor (Tho-D) twice within 60 minutes
or for 60 minutes continuously.
Continuously high hot
gas
230
■
AMS 10 not powered
■
Fault in the communication cable.
Communication fault with accessory
board
Communication error254
■
Sensor does not work (see section "Dis-
turbances in comfort")
■
Insufficient air circulation or blocked
heat exchanger
■
Defective control board in AMS 10
■
Too much refrigerant
Temperature deviation on the heat ex-
changer sensor (Tho-R1/R2) five times
within 60 minutes or for 60 minutes con-
tinuously.
High temperature in heat
exchanger
261
■
Can occur when 15V power supply to
the inverter PCB is unstable.
When IPM (Intelligent power module)
displays FO-signal (Fault Output) five
times during a 60-minute period.
Power transistor too hot262
■
Incoming power supply interference
■
Service valve closed
■
Insufficient amount of refrigerant
■
Compressor fault
■
Defective circuit board for inverter in
AMS 10
Voltage from the inverter outside the
parameters four times within 30 minutes.
Inverter error263
■
Open circuit in connection between
boards
■
Defective circuit board for inverter in
AMS 10
■
Defective control board in AMS 10
Communication between circuit board
for inverter and control board broken.
Inverter error264
■
Defective fan motor
■
Defective circuit board for inverter in
AMS 10
Continuous deviation on power transistor
for 15 minutes.
Inverter error265
■
Service valve closed
■
Loose connection sensor (BT15, BT3)
■
Defective sensor (BT15, BT3)
■
Too little refrigerant
Insufficient refrigerant is detected upon
start-up in cooling mode.
Insufficient refrigerant266
■
Defective circuit board for inverter in
AMS 10
■
Defective control board in AMS 10
■
Compressor fault
Failed start for compressorInverter error267
HBS 05Chapter 9 | Alarm list38