Rectify interference
6 720 643 196 (2010/02)
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2.5 Alarm from driver circuit board
Alarm from driver circuit board
Code Alarm text Check points
NAK 0-0 Stoppage due to overheated heat sink. B Check whether the fan runs.
B Check for contact paste between the heat sink
and electronics.
NAK 0-1 Stoppage due to overcurrent at start. B Check whether the inverter circuit board is defec-
tive.
B Check whether the compressor is defective.
B Check whether the initiation data is incorrect.
NAK 0-2 Stoppage due to overcurrent. B Check whether the inverter circuit board is defec-
tive.
B Check whether the compressor is defective.
B Check whether the initiation data is incorrect.
NAK 0-3 Stoppage due to overvoltage (DC). The com-
pressor increases too quickly.
B Check the supply (15V DC).
NAK 0-4 Current sensor warning. Current sensor defective.
B Replace inverter circuit board.
NAK 0-5 Thermistor tripped on inverter circuit board. Faulty sensor in power transistor.
B Replace inverter circuit board.
NAK 0-6 Current sensor tripped. Current sensor defective.
B Replace inverter circuit board.
NAK 0-7 Data not received. B Check the 15-supply to the inverter circuit board,
13-18V on terminal block 5-7.
NAK 0-8 Stoppage due to undervoltage DC. B Check the supply (15V DC).
B Check the condensers.
Tab. 21
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