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Mitsubishi Electric PURY-P200 Service Handbook page 179

City multi r410a
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2Solenoid valve (SVA, SVB, SVC)
Faulty judgment of solenoid valve
Stop the operation of the applied BC remote controller system.
(Use the remote controller to turn off.)
Stop the
Stop the
operation.
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 applied solenoid valve.
Check the operation sound of the solenoid valve, which must be
magnetized at the time of turning on the remote controller.
Makes a tick sound.
Makes a tick sound.
YES
Check the relay output with
the self-diagnosis monitor
LED, and check whether
the operation corresponds
with the operation mode.
Corresponds
YES
Measure the piping temperature of the
front and the rear 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.
YES
Faulty judgment of solenoid valve
NO
NO
NO
Remove the solenoid valve coil,
and check that there is a suction force.
Measure the piping temperature
of the front and the rear of the
solenoid valve, and compare the
temperatures.
There is no temperature
difference. : OK
Note2
There is a temperature
difference. : NO
Replace the
control board.
Note2
OK
- 176 -
Fix the fault.
Note1
NO
There is a
There is a
suction force.
suction force.
YES
Note2
NO
OK
YES
Faulty solenoid valve body
Stop the unit with the
remote controller.
Remove the solenoid
valve connector, and
check that the electricity
runs through the
solenoid valve coil.
NO
The electricity runs.
The electricity runs.
YES
Turn on the remote
controller with the
connector of the applied
solenoid valve is dis-
connected, and check
that the control board
outputs 220~240V.
YES
Output 220~240V.
NO
Replace the
Replace the
control board.
solenoid
valve coil.
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