Troubleshooting SiUS12-814
140 Service Diagnosis
5.19 Position Sensor Abnormality
Remote
Controller
Display
H6
Outdoor Unit LED
Display
A 5 1 4 2 4 3 1 4 1
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 system will shut down if the error occurs 8 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.13
Refer to P.165
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
(R7175)
NO
NO
NO
YES
YES
NO
YES
Check No. 13
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?
DC320±30V?
Any LED off?
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