May be due toDescriptionAlarm text on the displayAlarm
• Defective fan motor
• Defective circuit board for inverter in F2050
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 F2050
• Defective control board in F2050
• Compressor fault
Failed start for compressorInverter error267
• Sudden power failureOvercurrent, Inverter A/F moduleInverter error268
• Cold weather conditions
• Sensor fault
Temperature of BT28 below the value that per-
mits operation
Cold outdoor air271
• Warm weather conditions
• Sensor fault
Temperature of BT28 above the value that
permits operation
Hot outdoor air272
• Open circuit or short circuit on sensor input
• Sensor does not work (see section "Disturb-
ances in comfort")
• Defective control board in F2050
Sensor fault, heat exchanger in F2050(Tho-R).Sensor fault Tho-R277
• Open circuit or short circuit on sensor input
• Sensor does not work (see section "Disturb-
ances in comfort")
• Defective control board in F2050
Sensor fault, outdoor temperature sensor in
F2050 (Tho-A).
Sensor fault Tho-A278
• Open circuit or short circuit on sensor input
• Sensor does not work (see section "Disturb-
ances in comfort")
• Defective control board in F2050
Sensor fault, hot gas in F2050 (Tho-D).Sensor fault Tho-D279
• Open circuit or short circuit on sensor input
• Sensor does not work (see section "Disturb-
ances in comfort")
• Defective control board in F2050
Sensor fault, suction gas in F2050 (Tho-S).Sensor fault Tho-S280
• Open circuit or short circuit on sensor input
• Sensor does not work (see section "Disturb-
ances in comfort")
• Defective control board in F2050
• Fault in the refrigerant circuit
Sensor fault, low pressure transmitter in F2050.Sensor fault LPT281
• Outdoor module and indoor module are not
compatible.
Heat pump and indoor module do not function
together properly due to technical parameters.
Non-compatible air/water
heat pump
294
Open circuit or short circuit on sensor inputSensor fault, Sensor high pressure heating/low
pressure cooling in F2050 (BP4).
Sensor fault BP4404
Sensor does not work (see section "Disturb-
ances in comfort")
Defective control board AA23 in F2050
39Chapter 10 | Disturbances in comfortNIBE F2050
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