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2 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?
No
OK?
Magnetic force
is OK?
Remove the coil and check for
a magnetic force.
Correct the problem.
Stop the unit.
Yes
No
Note 1
No
Yes
Yes
Yes
No
No
Yes
Note 3
Yes
Yes
No
Yes
No