Table of Contents
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Are the low pressure protector
and main control board wired
Method : Disconnect the plug.
Measure the resistance of the
low pressure protector. If the
protector is normal the value is
0. Does a problem still exist ?
Is the outdoor ambient
temperature too low ?
Is the valve core of the high
pressure valve fully opened?
Is the indoor fan running
properly in cooling mode ?
Replace outdoor main board.
Does a problem still exist ?
When the level of refrigerant is not
sufficient, does the system function
properly after more refrigerant is added?
Check whether the refrigerant
system is functioning properly.
Note: For certain models, outdoor PCB cannot be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.
Low pressure protection
properly ?
Yes
Is the low pressure
protector defective?
Yes
No
Yes
Yes
No
No
Troubleshooting
Reconnect the low pressure protector
No
and main control board
Replace low pressure protector
No
Yes
Stop the unit until temps rise
Open the valve core of the high
No
pressure valve
Please refer to the solution of the
No
"Fan Speed is operating outside of
normal range" malfunction.
36
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Chapters
Table of Contents
Troubleshooting
