Nibe AMS10 - Page 44

May be due toDescriptionAlarm text on
the display
Alarm
- Sensor does not work (see "Temperature
sensor" section)
Temperature deviation on the heat exchanger
sensor (Tho-R1/R2) 5 times within 60 minutes
or for 60 minutes continuously
High HX temp261
- Insufficient air circulation or blocked evaporator
- Defective control board in AMS 10
- Too much refrigerant
Also see the troubleshooting guide on page 51
Can occur when the 15V power supply to the
inverter is unstable.
The inverter module has activated the alarm for
high temperature 5 times within 60 minutes
Inverter error262
- Incoming power supply interferenceVoltage from the inverter outside the paramet-
ers 4 times within 30 minutes
Inverter error263
- Service valve closed
- Insufficient amount of refrigerant
- Compressor fault
- Defective circuit board for inverter in AMS 10
Also see the troubleshooting guide on page 52
- Open-circuit in connection between boardsCommunication between circuit board for invert-
er and control board broken 3 times in at least
15 seconds
Inverter error264
- Defective circuit board for inverter in AMS 10
- Defective control board in AMS 10
Also see the troubleshooting guide on page 54
- Defective fan motorContinuous deviation on power transistor for
15 minutes.
Inverter error265
- Defective circuit board for inverter in AMS 10
Also see the troubleshooting guide on page 55
- Service valve closedInsufficient refrigerant has been detected at
start-up in cooling operation. 1 minute after
start-up, BT15 must have decreased 4K com-
pared to BT3.
Insufficient refri-
gerant
266
- Loose connection sensor (BT15, BT3)
- Defective sensor (BT15, BT3)
- Too little refrigerant
Also see the troubleshooting guide on page 56
- Defective circuit board for inverter in AMS 10Failed start for compressorInverter error267
- Defective control board in AMS 10
- Compressor fault
Also see the troubleshooting guide on page 56
- Sudden power failureOvercurrent to inverter 4 times within 30
minutes
Inverter error268
Also see the troubleshooting guide on page 57
- Open-circuit or short-circuit on sensor inputThe input for the sensor receives unreasonably
high or low value 3 times within 40 minutes
Sensor fault Tho-
R
277
- Sensor does not work (see "Temperature
sensor" section)
- Defective control board in AMS 10
Also see the troubleshooting guide on page 57
- Open-circuit or short-circuit on sensor inputThe input for the sensor receives unreasonably
high or low value 3 times within 40 minutes
Sensor fault Tho-
A
278
- Sensor does not work (see "Temperature
sensor" section)
- Defective control board in AMS 10
Also see the troubleshooting guide on page 58
- Open-circuit or short-circuit on sensor inputThe input for the sensor receives unreasonably
high or low value 3 times within 40 minutes
Sensor fault Tho-
D
279
- Sensor does not work (see "Temperature
sensor" section)
- Defective control board in AMS 10
Also see the troubleshooting guide on page 58
NIBE AMS10Chapter 6 | Troubleshooting44