MITSUBISHI ELECTRIC P500YMF-C User Manual

Page 99

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Solenoid Valve

Change the
solenoid valve.

Change the control
board.

220-240V output?

With the solenoid valve con-
nector is disconnected from the
board, use remote controller to
turn on the unit and check the
output (220-240V) from the
controller board.

Conductance present?

Disconnect solenoid valve
connector from the board and
check for a solenoid coil
conductance.

Solenoid valve
faulty

Solenoid valve

troubleshooting

Check solenoid valve wiring
for incorrect connection, and
connector disconnection or
looseness.

No problem.

Operate cooler and heater for
the applicable solenoid valve’s
refrigerant system only.

Clicking noise

produced when working

timing?

Measure piping temperature
on both sides of solenoid
valve and check for following.
Solenoid valve ON:
no differential
Solenoid valve OFF:
differential

Solenoid valve
normal

OK?

Measure pipe temperature of
inlet and outlet sides of
solenoid valve.
No temperature differential: OK
Temperature differential: NG

Operation OFF?

OK?

Magnetic force

is OK?

Remove the coil and check for
a magnetic force.

Correct the problem.

Stop the unit.

Yes

Note 1

Yes

Note 3

Yes