Sharp AE-Z40KR - MALFUNCTION (PARTS) CHECK METHOD; Outdoor Unit IPM;Compressor Defect Diagnosis

AYZP40KR
3 – 8
YES
Immediately
after startup
YES
YES
NO
NO
NO
YES
NO
Connect power cord
to AC outlet.
Normal
NO
Replace outdoor unit PWB.
Using remote control,
operate air conditioner
so that compressor
starts.
Is there 230 VAC
between (1) and (N)
on outdoor unit PWB
Is LED1 on outdoor
unit flashing?
Compressor starts up.
Does LED1 indicate
DC overcurrent error?
Does LED1 indicate
rotation error?
Outdoor unit PWB.
15/5 V display section.
Voltage OK.
Replace compressor.
Check inter-unit wiring.
Check indoor unit PWB.
Does LED1 remain lit?
Serial signal error.
Check inter-unit wiring.
Check indoor and
outdoor unit PWBs.
Replace outdoor unit
PWB.
Check compressor.
2/3-way valve closed.
Refrigerant shortage.
Is there 320 VDC between
pins IPM (31) and (35)?
+13 V, +15 V on PWB.
+13 V on PWB.
Replace outdoor unit PWB.
Replace expansion valve.
End.
Check posistor (PTC1)
(about 40 at 25 ).
Check IPM.
Check fan motor.
Check outdoor unit PWB.
Check wiring.
Check PAM IGBT (Q5).
Disconnect expansion
valve connector.
Replace outdoor unit PWB.
After about
20 seconds
YES
NO
NO
YES
NO
NO
YES
YES YES
No
(unlit)
OK
Replace outdoor unit PWB.