Troubleshooting SiUS04-904
Service Diagnosis 123
4.14 Position Sensor Abnormality
4.14.1 09/12 Class
Remote
Controller
Display
H6
Method of
Malfunction
Detection
A compressor startup failure is detected by checking the compressor running condition through the
position detection circuit.
Malfunction
Decision
Conditions
The compressor fails to start in about 15 seconds after the compressor run command signal is
sent.
Clearing condition: Continuous run for about 10 minutes (normal)
The system is shut down if the error occurs 16 times.
Supposed
Causes
Compressor relay cable disconnected
Compressor itself defective
Outdoor unit PCB defective
Stop valve closed
Input voltage out of specification
Troubleshooting
Check No.29
Refer to P.152
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts damage may occur.
(R10496)
NO
NO
NO
YES
YES
NO
YES
YES
Check No. 29
Check for short-circuit.
Check with the inverter checker (*).
Turn off the power. Disconnect the
harnesses U, V and W.
Check the electrolytic capacitor
voltage.
Electricals or
compressor harnesses
connected as specified?
Replace the outdoor unit
PCB.
Replace the compressor.
Correct the power supply or
replace the outdoor unit
PCB.
Reconnect as specified.
Replace the outdoor unit
PCB, outdoor unit fan.
* Inverter checker
Part No.: 1225477
Normal?
DC290~380V?
Any LED off?
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