Daikin SUPER MULTI NX G Series - Compressor Lock

Troubleshooting SiUS12-928_A
117 Service Diagnosis
5.12 Compressor Lock
Remote
Controller
Display
E6
Outdoor Unit LED
Display
A 5 1 1 2 4 3 4 4 1
Method of
Malfunction
Detection
A compressor lock is detected by checking the compressor running condition through the position
detection circuit.
Malfunction
Decision
Conditions
 Judging from the current waveform generated when high-frequency voltage is applied to the
compressor.
 If the error repeats 16 times, the system is shut down.
 Reset condition: Continuous run for about 5 minutes without any other error
Supposed
Causes
 Compressor locked
Troubleshooting
Turn off the power. Disconnect the
harnesses U, V, and W.
(R11301)
Caution
NO
YES
YES
NO
NO
YES
Check with the inverter checker (∗).
Turn off the power and reconnect
the harnesses. Turn on the power
again and restart the system.
(Precaution before turning on the power again)
Make sure the power has been off for at least 30 seconds.
Correct the power supply or
replace the SPM or the
PM1.
(Replace the outdoor unit
PCB.)
∗ Inverter checker
Part No.: 1225477
Replace the compressor.
Replace it as required.
Replace the compressor.
Check the electronic
expansion valve.
Normal?
Emergency
stop without compressor
running?
System shut
down after errors repeated
several times?
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.