Midea MS11M-09HRFN1-BW0W Service Manual page 50

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