Daikin Altherma fault E6-00

What it means

The motor rotor does NOT rotate when the compressor is energized.

Likely causes

1. Faulty discharge pipe thermistor or connector fault
2. Closed stop valve in the refrigerant circuit
3. Clogged refrigerant circuit
4. Refrigerant overcharge or shortage
5. Non-condensables and/or humidity in the refrigerant circuit
6. Faulty compressor or miswiring of the compressor power supply cable
7. Faulty main PCB
8. Faulty inverter PCB
9. Faulty 4-way valve
10. Faulty expansion valve
11. Faulty refrigerant pressure sensor
12. Poor water flow through high pressure side plate heat exchanger
13. Incorrect refrigerant charge
14. Compressor guard timer active
15. Special software control activated - water loop temperature is too low causing ONLY the backup heater to operate
16. Faulty compressor winding
17. Faulty suction thermistor
18. Blockages in refrigerant circuit
19. Worn or damaged compressor dampers causing vibration/noise
20. Normal inverter control behavior when target temperature achieved
21. Flammable refrigerant remaining dissolved in compressor lubricant
22. Wrong assembly during repair
23. Excessive heat applied during brazing near compressor pipes

Where to start

1. Perform a check of the discharge pipe thermistor
2. Check that all stop valves of the refrigerant circuit are open
3. Check if the refrigerant circuit is clogged