Midea M2OE-14HFN1-Q Service Manual page 48

Service manual
11.3.2.6 Low pressure protection (ODU P2)(ForM4OE-28HFN1-Q, M4OB-36HFN1-Q, M5OE-42HFN1-Q)
Low pressure protection
Whether the wiring
between the low pressure
protector and main control
board is connected well or
correctly
Yes
Whether the low
pressure protector
is broken
Method: Disconnect the plug.
Measure the resistance of the
low pressure protector. If the
protector is normal the value is
o
Yes
Check whether the outdoor
ambient temperature is too
low
No
Check whether valve core
of high pressure valve is
opened
Yes
Check if the indoor fan runs
properly in cooling mode
Yes
Replace outdoor main board
No
Refrigerant is not enough add the
refrigerant
No
Check whether the refrigerant
system is ok
48
Connect it well
No
Replace low pressure protector
No
Yes Stop the unit
Open fully valve core of
No
high pressure valve
please refer to the solution of fan
speed has been out of control
No
malfunction. Find out the cause and
have it solved.
DM16-01.01.11-01en
Multi DC inverter R410A. Outdoor unit