– 108 –
Check
code
Outdoor
LED display
Check and troubleshooting
(Item without special mention indicates part of outdoor unit.)
[1C]
(Continued)
[Communication error between MCUs]
[Communication error between MCUs]
[1D]
[Compressor lock]
[1E]
[Discharge temp. error]
YES
NO
Are connections of CN802 on P.C.B MCC-5071
and CN802 on P.C.B MCC-1571 correct?
Correct connection.
Check outdoor P.C. Boards.
Defect
→
Replace.
YES
NO
Are connections of CN804 on P.C.B MCC-5071
and CN800 on P.C.B MCC-1571 correct?
Correct connection.
Check outdoor P.C. Boards.
Defect
→
Replace.
YES
NO
Is AC mains voltage correct?
(198 to 264V)
Check wiring construction.
Ask repair of power supply.
Check wire connection
and correct it.
Check outdoor P.C.B MCC-1571.
Defect
→
Replace.
Compressor lock
→
Replace.
Check TE, TS sensors and PMV.
Detect
→
Replace.
Check outdoor P.C.B MCC-5071.
Defect
→
Replace.
Is wire connection correct?
Compressor lead
(Board side, Compressor Side),
Reactor lead, Power supply lead.
Is compressor under correct condition?
Is there refrigerant stagnation?
Does PMV correctly operate?
YES
YES
YES
YES
NO
NO
NO
NO
YES
NO
Is there gas leak?
Is there refrigerant shortage?
Repair defective position.
Recharge refrigerant.
Repair defective position.
Replace defective part.
YES
YES
YES
NO
NO
NO
Is PMV under correct conditions?
Does an abnormal overload happen?
Is connection of CN600 on P.C.B. MCC-5071?
Is resistance value of TD sensor correct?
Remove and improve
the cause of overload.
Correct connector.
Sensor error
→
Replace.
Check outdoor P.C.B MCC-5071.
Defect
→
Replace.