Nibe F2040 - Page 51

May be due toDescriptionAlarm text on
the display
Alarm no. in-
door unit
- Any isolator switches for F2040 offCommunication between the control
board and the communication board is
interrupted. There must be 22 volt direct
current at the connector
OU Com. error223
- Incorrect cable routing
CNW2 on the control board (PWB1).
- The fan cannot rotate freelyDeviations in the fan speed in F2040.Fan alarm224
- Defective control board in F2040
- Defective fan motor
- Control board in F2040 dirty
- Fuse (F2) blown
- Sensor does not work (see "Temperature
sensor" section)
Temperature deviation on the hot gas
sensor (Tho-D) two times within 60
minutes or for 60 minutes continuously.
Permanent Hot-
gas
230
- Insufficient air circulation or blocked heat
exchanger
- If the fault persists during cooling, there
may be an insufficient amount of refriger-
ant.
- Defective control board in F2040
- F2040 unpowered.Communication fault with accessory card.Communication
error.
254
- Fault in the communication cable.
- Sensor does not work (see "Disturbances
in comfort" section)
Temperature deviation on the hot gas
sensor (Tho-R1/R2) five times within 60
minutes or for 60 minutes continuously.
High HX temp261
- Insufficient air circulation or blocked heat
exchanger
- Defective control board in F2040
- Too much refrigerant
Can occur when 15V power supply to the
inverter PCB is unstable.
When IPM (Intelligent power module)
displays FO-signal (Fault Output) five times
during a 60-minute period.
Power transistor
too hot
262
- Incoming power supply interferenceVoltage from the inverter outside the
parameters four times within 30 minutes.
Inverter error263
- Service valve closed
- Insufficient amount of refrigerant
- Compressor fault
- Defective circuit board for inverter in
F2040
- Open-circuit in connection between
boards
Communication between circuit board for
inverter and control board broken.
Inverter error264
- Defective circuit board for inverter in
F2040
- Defective control board in F2040
- Defective fan motorContinuous deviation on power transistor
for 15 minutes.
Inverter error265
- Defective circuit board for inverter in
F2040
49Chapter 6 | TroubleshootingNIBE™ F2040