Low
pressure protection
Low pressure protection
Are the low pressure protector
and main control board wired
properly
?
Are the low pressure protector
and main control board wired
properly?
Yes
Reconnect the low pressure protector
and main control board
Reconnect the low pressure protector
and main control board
Replace outdoor main board
Replace outdoor main board
No
Replace low pressure protector
Replace low pressure protector
Is the outdoor ambient
temperature too low?
Is the outdoor ambient
temperature too low?
No
Stop the unit
Stop the unit Yes
Open the valve core of the high
pressure valve
Open the valve core of the high
pressure valve
No
Is the valve core of the high
pressure valve fully opened?
Is the valve core of the high
pressure valve fully opened?
Is the indoor fan running
properly in cooling mode?
Is the indoor fan running
properly in cooling mode?
Refer to the solution to the malfunction
of fan speed being out of control. Find
the cause and resolve the problem.
Refer to the solution to the malfunction
of fan speed being out of control. Find
the cause and resolve the problem.
No
Yes
Yes
Check whether the refrigerant
system is functioning properly.
Check whether the refrigerant
system is functioning properly.
No
Is it in working order?
Is it in working order?
No
When the level of refrigerant is
not sufficient, doe the system
function properly after more
refrigerant is added?
When the level of refrigerant is
not sufficient, doe the system
function properly after more
refrigerant is added?
Is the low pressure protector
broken?Method: Disconnect the
plug. Measure the resistance of
the low pressure protector. If the
protector is normal the value is o.
Is the low pressure protector
broken?Method: Disconnect the
plug. Measure the resistance of
the low pressure protector. If the
protector is normal the value is o.
No
Yes
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
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