–98–
2 Solenoid Valve
Change the
solenoid valve.
Change the control
board.
220-240V output?
With the solenoid valve con-
nector being 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 the solenoid valve
wiring for incorrect connec-
tion and for disconnected or
loose connectors.
Was the problem
found?
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 the 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
magnetic force.
Correct the problem.
Stop the unit.
Ye s
No
Note 1
No
Ye s
Ye s
Ye s
No
No
Ye s
Note 3
Ye s
Ye s
No
Ye s
No
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