If the sampling voltage is not 5V, the LED displays the failure.
Yes
Yes
No
No
No
Yes
Yes
No
Yes
No
No
NO
High Pressure Protection
Is the wiring between the high
pressure switch and main control
connected well or correct?
Connect it well.
Is the high pressure
protector broken?
Method: Disconnect the plug.
Measure the resistance of the
high pressure protector, if the
protector is normal,
the value is o.
Replace the high pressure protector.
Check if the outdoor ambient
temperature is higher than
122° F (50°C).
Stop the unit.
Check if the
outdoor ventilation is good.
Improve the unit’s ventilation.
Check if the outdoor fan
operates properly.
Refer to the fan speed out of
control malfunction solution.
Determine the cause and resolve.
Check whether the
heat exchanger is dirty.
Clean the heat exchanger.
Check if the refrigerant system is ok.
Replace the outdoor main board.
Yes
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