Troubleshooting Guide

Troubleshooting 50
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
?
Method
:
Disconnect the plug
.
Measure the resistance of the
low pressure protecto
r
.
I
f the
protector is normal the value is
o
.
Does a problem still exist
?
Method: Disconnect the plug.
Measure the resistance of the
low pressure protector. If the
protector is normal the value is
o. Does a problem still exist?
Yes
Yes
Replace outdoor main board
.
Does a
problem still exist
?
Replace outdoor main board..
Does a problem still exist?
No
No
Is the low pressure
protector broken
?
Is the low pressure
protector broken
?
Is the outdoor ambient
temperature
too low
?
Is the outdoor ambient
temperature too low?
No
Yes
No
Is the
valve core of
the
high
p
ressure
valve
fully o
pened
?
Is the
valve core of
the
high
p
ressure
valve
fully o
pened
?
Is the indoor fan running
properly in cooling mode
?
Is the indoor fan running
properly in cooling mode?
No
Yes
Yes
No
Check whether the refrigerant
system is functioning properly
.
Check whether the refrigerant
system is functioning properly
.
When the lvel of refrigerant is not
sufficient
,
doe the system function
properly after more refrigerant is added
?
When the level of refrigerant is not
sufficient, does the system function
properly after more refrigerant is added?
No
Reconnect the low pressure protector and main
control board
Reconnect the low pressure protector and main
control board
R
eplace low pressure protector
Replace low pressure protector
Open the valve core of the high
pressure valve
Open the valve core of the high
pressure valve
Stop the unit
Stop the unit
Please refer to the solution of
the
“
Fan
S
p
eed
is
operating outside of normal
range
”
malfunction
.
Please refer to the solution of the “ Fan
Speed is operating outside of normal
range
” malfunction .
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.