13-20
TROUBLESHOOTING
SM OU12HP 2-E.2 GB
1) Check the impedance in the coil wires to be as following:
Grey wire to each of the other wires – about 100
Other wires – each one to the others (except grey) – about 50
2) When Outdoor unit is powered on, EEV shall have vibration and click sound. If not, replace the
coil with the additional one and check again – turn OFF the unit and than turn it ON, vibration
and click sound should be performed. If OK, the coil was damaged and require to be replaced.
3) Turn OFF the unit, insert a good coil onto an additional operating valve and turn the unit ON,
vibration and click sound should be performed. If OK, replace EEV valve from the unit.
4) If both EEV coil and valve are still not operating, replace the ODU main board.
Replacing EEV Valve Coil - (14.1.8)
Replacing EEV Valve - (14.1.9)
Replacing main board - (14.1.13)
13.5.13 Checking Thermistors
1) Check Thermistor connections and wiring - Replace if needed.
2) Check sensor visually - Replace if needed.
3) Check thermistor sensor attachment to pipe (or other parts), specially pay attention to the spring
holding the sensor towards its sensing part – repair if needed.
4) Disconnect the connector from the main board and check Thermistor resistance – should be
according the charts below for each sensor. If not in range of 10%, replace thermistor.
5) If thermistor resistance check is OK but reading is still wrong, replace main board.
OAT, OCT, OMT, ICT, RAT Chart
R-T Table
0.1
1.0
10.0
100.0
1000.0
-30 -20 -10 0 10 20 30 40 50 60 70 80 90 100
Temperature [C]
Resistance [kOhm]
R
25°C
=10k
:
25/85°C
=3977K
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