Nibe SPLIT HBS 12 Installation And Maintenance Instructions Manual page 71

Alarm Alarm text on the dis-
no. play
E38 S. fault Tho-A
E39 S. fault Tho-D
E40 HP alarm
E41 Power transistor too hot
E42 Inverter error
E45 Inverter error
E47 Inverter error
E48 Fan alarm
E49 LP alarm
E51 Inverter error
Description
Sensor fault, outdoor sensor in AMS 10 (Tho-A).
Sensor fault, hot gas in AMS 10 (Tho-D).
The high pressure pressostat (63H1) deployed 5
times within 60 minutes or under 60 minutes
continuously.
When IPM (Intelligent power module) displays
FO-signal (Fault Output) five times during a 60-
minute period.
Voltage from the inverter outside the parameters
four times within 30 minutes.
Communication between circuit board for invert-
er and control board broken.
Overcurrent, Inverter A/F module
Deviations in the fan speed in AMS 10.
Too low value on the low pressure transmitter 3
times within 60 minutes.
Continuous deviation on power transistor for 15
minutes.
NIBE™ SPLIT
May be due to
- Open-circuit or short-circuit on sensor input
- Sensor does not work (see "Temperature
sensor" section)
- Defective control board in AMS 10
- Open-circuit or short-circuit on sensor input
- Sensor does not work (see "Temperature
sensor" section)
- Defective control board in AMS 10
- Insufficient air circulation or blocked heat ex-
changer
- Open circuit or short circuit on input for high
pressure pressostat (63H1)
- Defective high pressure pressostat
- Expansion valve not correctly connected
- Service valve closed
- Defective control board in AMS 10
- Low or no flow during heating operation
- Defective circulation pump
- Defective fuse, F(4A)
Can occur when 15V power supply to the inverter
PCB is unstable.
- Incoming power supply interference
- Service valve closed
- Insufficient amount of refrigerant
- Compressor fault
- Defective circuit board for inverter in AMS 10
- Open-circuit in connection between boards
- Defective circuit board for inverter in AMS 10
- Defective control board in AMS 10
- Sudden power failure
- The fan cannot rotate freely
- Defective control board in AMS 10
- Defective fan motor
- Control board in AMS 10 dirty
- Fuse (F2) blown
- Open circuit or short circuit on input for low
pressure transmitter
- Defective low pressure transmitter
- 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)
- Defective fan motor
- Defective circuit board for inverter in AMS 10
Miscellaneous
Alarm list
67