Nibe AMS 10-8 Installer Manual page 35

Alarm Alarm text on the display
254 Communication error
261 High temperature in heat
exchanger
262 Power transistor too hot
263 Inverter error
264 Inverter error
265 Inverter error
266 Insufficient refrigerant
267 Inverter error
268 Inverter error
271 Cold outdoor air
272 Hot outdoor air
277 Sensor fault Tho-R
278 Sensor fault Tho-A
279 Sensor fault Tho-D
NIBE AMS 10
Description
Communication fault with accessory board
Temperature deviation on the heat ex-
changer sensor (Tho-R1/R2) five times
within 60 minutes or for 60 minutes con-
tinuously.
When IPM (Intelligent power module) dis-
plays FO-signal (Fault Output) five times
during a 60-minute period.
Voltage from the inverter outside the para-
meters four times within 30 minutes.
Communication between circuit board for
inverter and control board broken.
Continuous deviation on power transistor
for 15 minutes.
Insufficient refrigerant is detected upon
start-up in cooling mode.
Failed start for compressor
Overcurrent, Inverter A/F module
Temperature of BT28 (Tho-A) below the
set value that permits operation
Temperature of BT28 (Tho-A) above the
value that permits operation
Sensor fault, heat exchanger in
AMS 10(Tho-R).
Sensor fault, outdoor temperature sensor
in AMS 10 BT28 (Tho-A).
Sensor fault, hot gas in AMS 10 (Tho-D).
May be due to
• AMS 10 not powered
• Fault in the communication cable.
• Sensor does not work (see section
turbances in comfort")
• Insufficient air circulation or blocked heat
exchanger
• Defective control board in AMS 10
• Too much refrigerant
• 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
• Defective fan motor
• Defective circuit board for inverter in
AMS 10
• Service valve closed
• Loose connection sensor (BT15, BT3)
• Defective sensor (BT15, BT3)
• Too little refrigerant
• Defective circuit board for inverter in
AMS 10
• Defective control board in AMS 10
• Compressor fault
• Sudden power failure
• Cold weather conditions
• Sensor fault
• Warm weather conditions
• Sensor fault
• Open circuit or short circuit on sensor
input
• Sensor does not work (see section
turbances in comfort")
• Defective control board in AMS 10
• Open circuit or short circuit on sensor
input
• Sensor does not work (see section
turbances in comfort")
• Defective control board in AMS 10
• Open circuit or short circuit on sensor
input
• Sensor does not work (see section
turbances in comfort")
• Defective control board in AMS 10
Chapter 9 | Alarm list
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