13-19
TROUBLESHOOTING
SM OU12HP 2-E.2 GB
3)b Check motor current 4) Check motor current
Replacing outdoor unit fan motor - (14.1.6)
Replacing main board - (14.1.13)
13.5.10 Checking Compressor
1) Check Compressor connections - Repair if needed.
2) Check the resistance between the three phases – all three coil resistances should be the
same: around 0.188.
3) Check the compressor current while operating to be the same on each wire - In case
of abnormal current (no current or excessive current), the problem could be of driver or
compressor – if driver is checked to be operating well (13.5.5), replace the compressor.
3) Check Compressor motor current
Replacing compressor- (14.1.10)
13.5.11 Checking Reverse Valve (RV)
The RV has two parts, Solenoid and valve.
1) Disconnect the RV connector from the main board and operate the unit in heating mode, check
the voltage between two pins of reverse valve connector on the controller, normal voltage is
230VAC - if no power supply to RV, replace outdoor main board.
2) Check RV operation with direct 230VAC power supply. If RV solenoid is OK (but still no heating
operation while compressor is ON), replace the RV valve from the refrigeration system.if not,
replace the RV coil.
Replacing RV Coil (14.1.7)
Replacing RV Valve - (14.1.9)
Replacing main board - (14.1.13)
13.5.12 Checking Electrical Expansion Valve (EEV)
The EEV has two parts, step motor and valve. Use additional set of valve and coil to check the
system.
15
OFAN_UP
OFAN_DN
4
3
1
2
3
6
5
4
M
1
RED
1.0
18.0
COMPESSOR
U
VW
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