Pioneer YN018GMFI16M2D Service Manual page 44

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9.3.2.6 High pressure protection (ODU P1) (Only for
High pressure protection
Judge 1: Whether the wiring
between the high pressure
switch and main control
board is connected well or
correctly
Yes
Judge 2: Whether
the high pressure
protector is broken
Method: Short connect the
high pressure protector
socket, check whether the
system can run normally
No
Check whether
the refrigerant
system is ok
Judge 3: Check whether the
outdoor ambient
temperature is higher than
43℃
No
Judge 4: Check whether the
outdoor unit is bad
ventilation
No
Judge 5: Check whether the
heat exchanger is dirty
Judge 6: Check whether the
refrigerant pipe is blocked
Replace outdoor main board
YN036GMFI16M4D
No
Connect it well
Yes
Replace high pressure protector
Yes
Stop the unit
Yes
Make the outdoor unit ventilate well
Yes
Clean the heat exchanger
Let the refrigerant out, then use the
high pressure nitrogen or refrigerant to
Yes
blow pipe, vacuumize and charge the
refrigerant again
)

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