Samsung IDH1800E Service Manual page 92

EC12 : When the trouble is found on the part related to comp of outdoor unit.
Check point :
- Indoor unit PCB relay defect
- Output of indoor unit micom
- Comp defect
- Magnet switch defect
Is the power source normal? AC220~240 50Hz
Is there no wrong connection and contact of indoor
and outdoor connection wire?
Is the compressor being delayed for 3 minutes?
Is the desired temperature set higher than the current
one during the cooling operation?
Is the desired temperature set lower than the current
one during the cooling operation?
Is the RY71 on and compressor operting
when cooling mode operates and indoor unit
Is the output of outdoor unit micom pin 57
high when the compressor is on?
Is the voltage across RY7 coil of
Is the output of NO. 10 of IC05 of outdoor
unit low then the compressor is on?
Is the voltage AC220V across the terminal
of outdoor unit when the compressor is on?
Samsung Electronics
YES
PCB is shorted?
YES
outdoor PCB 12V?
Replace the compressor
NO
Check and replace
the related part
Normal
Check and replace
micom (IC04)
Check and replace
IC05
Replace the magnet
replay
Trouble Shooting
6-13