Nibe AMS 10-8 - Page 35

May be due toDescriptionAlarm text on the displayAlarm
• AMS 10 not powered
• Fault in the communication cable.
Communication fault with accessory boardCommunication 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) dis-
plays 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 para-
meters 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
• Sudden power failureOvercurrent, Inverter A/F moduleInverter error268
• Cold weather conditions
• Sensor fault
Temperature of BT28 (Tho-A) below the
set value that permits operation
Cold outdoor air271
• Warm weather conditions
• Sensor fault
Temperature of BT28 (Tho-A) above the
value that permits operation
Hot outdoor air272
• Open circuit or short circuit on sensor
input
• Sensor does not work (see section "Dis-
turbances in comfort")
• Defective control board in AMS 10
Sensor fault, heat exchanger in
AMS 10(Tho-R).
Sensor fault Tho-R277
• Open circuit or short circuit on sensor
input
• Sensor does not work (see section "Dis-
turbances in comfort")
• Defective control board in AMS 10
Sensor fault, outdoor temperature sensor
in AMS 10 BT28 (Tho-A).
Sensor fault Tho-A278
• Open circuit or short circuit on sensor
input
• Sensor does not work (see section "Dis-
turbances in comfort")
• Defective control board in AMS 10
Sensor fault, hot gas in AMS 10 (Tho-D).Sensor fault Tho-D279
35Chapter 9 | Alarm listNIBE AMS 10