Are the high pressure
switch and main control
boar wired correctly?
Method: Disconnect the plug.
Measure the resistance of the
high pressure protector, if
the protector is normal the
value is o, Does a problem
still exist?
Yes
Yes
Connect high pressure switch
and mian control board
No
Replace high pressure protectorNo
Is the high
pressure protector
broken?
Is the outdoor ambient
temperature is higher than
50 ?
No
Stop the unit Yes
Check if the outdoor unit
ventilation is good
Yes
Ensure that the outdoor unit
ventilation is functioning properly
Is the heat exchanger dirty?
No
Clean the heat exchangerYes
Check whether the refrigerant
system is functioning properly
Replace outdoor main
board. Is the problem
resolved?
No
P6/J5 displayed
High pressure protection
Is the outdoor fan running
properly?
please refer to the solution of fan
speed has been out of control
malfunction . Find out the cause and
have it solved.
No
Yes
NO
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