Troubleshooting Sheet

1.3.11 Low pressure protection diagnosis and solution(P6)
Error Code
P6
Malfunction decision
conditions
When the pressure of system reach a certain value, the low
pressure protector will switch off. After the pressure resume to
normal ,the protection code will disappear.
Supposed causes
●
Wiring mistake
● Pressure protector faulty
● Fan motor faulty
● PCB faulty
●
System problems.
Trouble shooting:
Whether the wiring
between the low pressure
protector and main control
board is connected well or
correctly
Whether the wiring
between the low pressure
protector and main control
board is connected well or
correctly
Method: Disconnect the
plug. Measure the
resistance of the low
pressure protecto
r. If the
protector is normal the value
is o
Method: Disconnect the
plug. Measure the
resistance of the low
pressure protector. If the
protector is normal the value
is o
Yes
Yes
Connect it well
Connect it well
Replace outdoor main board
Replace outdoor main board
No
Replace low pressure protector
Replace low pressure protector
No
Whether the low
pressure protector
is broken
Whether the low
pressure protector
is broken
Check whether the outdoor
ambient temperature is too
low
Check whether the outdoor
ambient temperature is too
low
No
Stop the unit
Stop the unit
Yes
Open fully valve core of high
pressure valve
Open fully valve core of high
pressure valve
No
Check whether valve core of
high pressure valve is
opened
Check whether valve core of
high pressure valve is
opened
Check if the indoor fan runs
properly in cooling mode
Check if the indoor fan runs
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
.
please refer to the solution of [fan
speed has been out of control
malfunction]. Find out the cause and
have it solved.
No
Yes
Yes
No
Check whether the
refrigerant system is ok
Check whether the
refrigerant system is ok
Refrigerant is not enough add the
refrigerant
Refrigerant is not enough add the
refrigerant
No