Nibe AMS10 - Troubleshooting; Alarm List

Alarm list
AMS 10 ALARM
The following alarms block AMS 10. Addition runs at min permitted supply temperature.
May be due toDescriptionAlarm text on
the display
Alarm
- Insufficient air circulation or blocked heat ex-
changer
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 high
pressure switch (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)
Also see the troubleshooting guide on page 46
- Open circuit or short circuit on input for low
pressure transmitter
Too low value on the low pressure sensor 3
times within 60 minutes.
LP alarm221
- Defective low pressure transmitter
- Defective control board in AMS 10
- Open circuit or short circuit on input for suction
gas sensor (Tho-S)
- Faulty suction gas sensor (Tho-S)
Also see the troubleshooting guide on page 47
- The fan cannot rotate freelyDeviations in the fan speed 5 times within 60
minutes
Fan alarm224
- Defective control board in AMS 10
- Defective fan motor
- Control board in AMS 10 dirty
- Fuse (F2) tripped
Also see the troubleshooting guide on page 49
- Sensor does not work (see "Temperature
sensor" section)
Temperature deviation on the discharge sensor
(Tho-D) 2 times within 60 minutes or for 60
minutes continuously
Permanent Hot-
gas
230
- Insufficient air circulation or blocked evaporator
- If the fault persists during cooling, there may
be an insufficient amount of refrigerant.
- Defective control board in AMS 10
Also see the troubleshooting guide on page 50
43Chapter 6 | TroubleshootingNIBE AMS10
6 Troubleshooting