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Mitsubishi Electric PURY-HP72 Service Handbook page 296

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[8-9 Troubleshooting Problems with Major Components on BC Controller ]
(1) Solenoid valve (SVA, SVB, SVC)
Faulty judgment of solenoid valve
Stop the operation of the applied
BC remote controller system.
Stop the operation
YES
Check whether the wire to the
solenoid valve is not connected
wrongly, or the connector is not loose.
No fault
YES
Run the cooling or heating operation
of the refrigerant system of the
solenoid valve in trouble.
Check the operation sound of the solenoid
valve to be magnetized at the time of
turning on the remote controller.
Makes a tick sound.
YES
Check the relay output with the
self-diagnosis LED, and check
whether the operation corresponds
with the operation mode.
Corresponds
YES
Measure the temperature at the upstream
and downstream pipes of the solenoid valve.
When the solenoid valve is ON : There is no temperature difference.
When the solenoid valve is OFF : There is a temperature difference.
OK
YES
Faulty judgment of solenoid valve
HWE13080
NO
NO
Repair the fault.
Note 1
NO
Remove the solenoid valve coil, and
check that there is a suction force.
There is a suction force.
YES
Measure the temperature at the upstream
and downstream pipes of the solenoid
valve, and compare them.
There is no temperature difference. : OK
There is a temperature difference. : NO
Note 2
OK
YES
Replace the control board.
Note 2
- 285 -
NO
Stop the unit with the remote controller.
Note 2
Remove the solenoid valve connector, and
check that the electricity runs through the
solenoid valve coil.
NO
The electricity runs.
YES
Turn on the remote controller with the
connector of the solenoid valve in trouble
disconnected, and check that the control
board outputs 200V.
Output 200V
NO
Replace the control board.
Solenoid valve failure
NO
YES
Replace the solenoid valve coil.
GB

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