Samsung AVXC1H022 series Service Manual page 322

I
,
Outdoor unit display
Indoor unit display
Judgment method
Causes
Compressors run correctly ?
The low pressure pipe from
indoor unit to outdoor unit is hot?
Pipe between 4 way valve
and accumulator is hot
Check the high and low pressure sensor
Samsung Electronics
,
- Some MCU solenoid valve works incorrectly.
- Cooling valve and heating valve are opened simultaneously.
- 4 way valve failure (leakage)
Yes
No
No
Check the wire connection and
No
measure the electrical resistance
between T1-T2,T2-T3,T3-T1 of
compressor
Cooling valve and heating valve
Yes
are opened simultaneously or large
leakage(from high pressure gas
side to low pressure gas side)in MCU
Yes
4 way valve has large leakage.
Change the 4 way valve
Troubleshooting
9-78