Service Manual

Troubleshooting SiUS041638E
73 Service Diagnosis
4.12 Compressor Lock
Error Code
E6
Method of Error
Detection
A compressor lock is detected by the current waveform generated when applying high-frequency
voltage to the motor.
Error Decision
Conditions

If the error repeats, the system is shut down.

Reset condition: Continuous run for about 11 minutes without any other error
Supposed
Causes

Closed stop valve

Compressor locked

Disconnection of compressor harness
Troubleshooting
Check No.12
Refer to P.94
Check No.15
Refer to P.96
Turn off the power. Disconnect the
harnesses U, V, and W.
(R21067)
Caution
NO
YES
YES
NO
NO
YES
NO
YES
Check No.15
Check with the inverter analyzer.
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 outdoor unit
PCB (main PCB).
Open the stop valve.
∗ Inverter analyzer:
RSUK0917C
Replace the compressor.
Replace the compressor.
Check the electronic
expansion valve coil.
Go to Check No. 12.
Any LED off?
Stop valve closed?
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.