Low Pressure Protection Diagnosis And Solution(P6); Error Code; Trouble Shooting - Midea MEHS-09PSH1 Service Manual

9.3.11 Low pressure protection diagnosis and solution(P6)

Error Code

Malfunction decision
conditions
Supposed causes

Trouble shooting:

Whether the wiring
between the low pressure
protector and main control
board is connected well or
pressure protector
Method: Disconnect the
resistance of the low
pressure protector. If the
protector is normal the value
Check whether the outdoor
ambient temperature is too
Check whether valve core of
high pressure valve is
Check if the indoor fan runs
properly in cooling mode
Replace outdoor main board
Refrigerant is not enough add the
Check whether the
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
Yes
Whether the low
is broken
plug. Measure the
No
is o
Yes
Yes
low
No
No
opened
Yes
No
Yes
No
refrigerant
No
Connect it well
Replace low pressure protector
Stop the unit
Open fully valve core of high
pressure valve
please refer to the solution of [fan
speed has been out of control
malfunction]. Find out the cause and
have it solved.