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Troubleshooting
Problem
Check point
Corrective measure
If the linear expansion valve becomes locked and the motor is still operating,
the motor will emit a clicking noise and will not function. This clicking noise
indicates an abnormality.
Use an all-purpose electrical meter to measure the resistance between the
different coils (red-white, red-orange, brown-yellow, brown-blue). Normal
resistance is within a range of 46Ω ± 4%.
In order to check the linear expansion valve, operate 1 indoor unit in the
fan mode and another in the cooling mode. Then, use the outdoor multi
controller board to operate the monitor and check the pipe temperature of
the indoor unit. The linear expansion valve should be fully closed when the
fan is operating. The temperature measured by the temperature sensor
will drop if there is any leakage.
If the measured temperature is significantly lower than that on the remote
controller, this indicates that the valve is not closed. It is not necessary to
replace the linear expansion valve if the leak of refrigerant is small and does
not cause a malfunction.
Check improperly connected connector terminals and the wire colors.
Remove the connector on the controller board side and check electrical
conductance.
Locked expansion
valve
Short circuit or broken
circuit in expansion
valve motor coil
Valve does not close
completely.
Incorrect connection
or connection failure
Replace the linear
expansion valve.
Replace the linear
expansion valve.
Replace the linear
expansion valve if there
is a major leak of
refrigerant.
Continuity check of
wrong part