Samsung APH289SEF Service Manual page 29

Troubleshooting
5-3-3 When Compressor does not operate.
1. Causes of Failure
1) Power voltage out of the motion boundary or poor power cord contact.
2) Poor wiring or poor contact between indoor and outdoor.
3) Poor Main PCB : poor relay (RY702)
2. Inspection Items
1) Power voltage? (AC198V ~ AC264V)
2) Wiring and contact between indoor and outdoor?
3) Compressor to check out 3 minutes delay(stand-by)?
4) Set temperature for "Cooling", comparing with current temperature?
3. Inspection Procedure
Turn power off and on in 5 seconds.
Start cooling by remote control,
both relay(RY702) and compressor on in
Check Fan speed output
wave style of pins No. MICOM(U101) #26 during
compressor on, "HIGH"?
Check relay(RY702) coil edge voltage during
compressor on, DC12V?
Outdoor power type : check edge
No. 1 ↔ 3 of wire between indoor and outdoor
during compressor on.
Exchange compressor.
28
3 minutes?
No
Yes
Yes
Yes
Yes
Good compressor and relay
Inspect and exchange
No
MICOM(U101).
Check Fan speed output
No
wave style of pins No. U104
#16, "LOW"?
Yes
Inspect and exchange
No
power relay(PCB position).
No Inspect and
exchange U104.
Samsung Electronics