Troubleshooting Guidelines - Daikin FTK-J series Technical Manual

Troubleshooting Guidelines

Error Codes Error Description
0 Normal
U0 Insuffi cient gas
U2 DC voltage out of range
U4 Communication error
UA Installation error
A1 Indoor PCB error
A5 Antifreeze
A6 Indoor fan motor abnormal
Indoor heat exchanger
C4
thermistor short/open
Indoor room thermistor
C9
short/open
E1 Outdoor PCB error
Compressor motor lock/
E5
overload
No action.
1. Check sensor connection.
2. Check stop valve.
3. Check for gas leak.
4. Check the EXV.
5. Check H8.
1. Check the supply voltage.
2. Check the outdoor fan by rotating with hand.
3. Restart the system.
4. Check power supply waveform.
1. Check the indoor unit - outdoor unit connection wires.
2. Check the voltage of the signal terminal.
3. Check the indoor fan by rotating with hand.
4. Check the power supply waveform.
1. Check the indoor and outdoor unit model name.
2. Check the part code on the indoor and outdoor PCB.
1. Check connector connection.
2. Replace indoor PCB.
1. Check the air passage.
2. Check the intake air fi lter.
3. Check dust accumulation on indoor coil.
4. Check wiring and piping.
5. Check the EXV.
6. Check indoor coil sensor resistance value.
7. Check refrigerant level.
8. Check room sensor resistance value.
1. Check the indoor fan by rotating with hand.
2. Replace indoor fan motor if not rotating smoothly.
3. Check fan motor voltage.
4. Replace indoor PCB if not at the rated voltage.
5. Check fan capacitor's conductivity (AC Motor).
6. Replace fan capacitor if there's conductivity.
1. Check the connector connection.
2. Check the sensor resistance value.
1. Restart the system.
2. Replace outdoor PCB.
3. Check to see that the unit is grounded.
4. Check power supply waveform.
1. Check connection on discharge pipe sensor.
2. Check discharge pipe sensor resistance value.
3. Check the EXV.
4. Check the refrigerant line on blockage or shortage.
Troubleshooting
Action
37