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Service Manual -
VMH 9/12/18/24 SU & VMH30/36S D Series
45
48
9.3.1
2
Low pressure protection diagnosis and solution
(P6)
Error Code
P6
Malfunction conditions
When the pressure of system reach
es
a
preset
value, the low
pressure protector will switch off. After the pressure re
turns
to
normal,
the protection code will disappear.
Possible
causes
●
Wiring
error
●
Pressure protector faulty
●
Fan motor faulty
●
PCB faulty
●
System problems
Troubleshooting:
Is the wiring between the
low pressure protector
and main control board
connected tightly and
correctly?
Correct wiring
Replace low pressure protector
Is the low
pressure protector
broken?
Disconnect the plug.
Measure the resistance of
the low pressure protector.
If the protector is normal
the value is 0.
Is the outdoor ambient
temperature too low?
Stop the unit
Is the valve core of high
pressure valve open?
Back seat valve core
of high pressure valve
Does the indoor
fan run properly in
cooling mode?
Please refer to the solution of
[Fan Speed Has Been Out Of
Control] malfunction. Find out the
cause and have it solved.
Replace outdoor
main board
Is refrigerant level OK?
Check whether the
refrigerant system is OK