Troubleshooting Guide

Troubleshooting 48
Are the high pressure switch
and main control boar wired
correctly
?
Are the high pressure switch
and main control board 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
?
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
No
No
Is the high pressure
protector broken
?
Is the high pressure
protector broken
?
Is the outdoor ambient
temperature is higher than
50
?
Is the outdoor ambient
temperature is higher than
50
?
No
Yes
Check if the outdoor unit
ventilation is good
Check if the outdoor unit
ventilation is good
Yes
Is the heat exchanger dirty
?
Is the heat exchanger dirty?
No
Yes
Replace outdoor main board
.
Is
the problem resolved
?
Replace outdoor main board. Is
the problem resolved?
No
High
pressure protection
High pressure protection
Is the outdoor fan running
properly
?
Is the outdoor fan running
properly?
No
Yes
NO
Connect high pressure switch and
mian control board
Connect high pressure switch and
main control board
Replace high pressure protector
Replace high pressure protector
Stop the unit
Stop the unit
Ensure that the outdoor unit
ventilation is functioning properly
Ensure that the outdoor unit
ventilation is functioning properly
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
S
p
eed
is
operating outside of normal
range
”
malfunction
.
Clean the heat exchanger
Clean the heat exchanger
Check whether the refrigerant
system is functioning properly
Check whether the refrigerant
system is functioning properly