May be due toDescriptionAlarm text on the displayAlarm
• Any circuit breakers for F2040 off
• Incorrect cable routing
Communication between the control board
and the communication board is interrup-
ted. There must be 22 volt direct current
(DC) at the switch CNW2 on the control
board (PWB1).
OU Com. error223
• The fan cannot rotate freely
• Defective control board in F2040
• Defective fan motor
• Control board in F2040 dirty
• Fuse (F2) blown
Deviations in the fan speed in F2040.Fan alarm224
• Sensor does not work (see section "Am-
bient temperature sensor")
• Insufficient air circulation or heat ex-
changer
• Blocked
• If the fault persists during cooling, there
may be an insufficient amount of refriger-
ant.
• Defective control board in F2040
Temperature deviation on the hot gas
sensor (Tho-D) twice within 60 minutes or
for 60 minutes continuously.
Continuously high hot gas230
• F2040 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 F2040
• 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
F2040
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
F2040
• Defective control board in F2040
Communication between circuit board for
inverter and control board broken.
Inverter error264
• Defective fan motor
• Defective circuit board for inverter in
F2040
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
F2040
• Defective control board in F2040
• Compressor fault
Failed start for compressorInverter error267
• Sudden power failureOvercurrent, Inverter A/F moduleInverter error268
57Chapter 10 | Alarm listNIBE F2040
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