Panasonic OCU-CR1001VF Installation Instructions Manual page 47

Failure Diagnosis
Method of Checking Resistance Value of Electronic Expansion Valve Coil
and Oil Level Switch
(1) Electronic expansion valve coil: Used in Oil control electronic expansion valve (MOV1), Electronic expansion valve for
Measure the resistance with the connector disconnected from the control PCB, and check if the resistance value is
correct by using the table below.
Measurement Position
Between connector 1-6
Between connector 2-6
Between connector 3-6
Between connector 4-6
(Ambient temperature 20°C)
Caution
The control PCB will fail when the refrigerator power is supplied while the coil resistance is 0 Ω (shorted).
When a motion failure of an electronic expansion valve is questioned, always check the resistance value of the
electronic expansion valve before replacing the control PCB.
(2) Oil level switch
Measure the resistance while the connector is disconnected from the control PCB, and check if the contacts are
normal in the table below.
Measurement position
Between connector 1-2
Between connector 2-3
pressure reduction (MOV5), Electronic expansion valve for gas return (MOV6),
Electronic expansion valve for liquid return (MOV7)
Resistance Value
185 Ω ± 18 Ω
185 Ω ± 18 Ω
185 Ω ± 18 Ω
185 Ω ± 18 Ω
<Electronic expansion valve connector>
6P11: Oil control electronic expansion valve (CMOV1)
6P13: Electronic expansion valve for pressure reduction (MOV5)
6P14: Electronic expansion valve for gas return (MOV6)
6P15: Electronic expansion valve for liquid return (MOV7)
Normal condition resistance value
0 Ω Infinity
Infinity 0 Ω
[Resistance measurement method]
Contact the tester lead to the terminal.
Abnormal condition
resistance value
Infinity 0 Ω
Infinity 0 Ω
[Resistance measurement method]
Contact the tester lead to the terminal.
3P22: Oil level switch wiring connector
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