Friedrich MM18YJ, Service Manual

Page: 51 / 83

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Energize the unit
and start it
If the compressor wire COMP(UVW) is
well connected and connection sequence
is correct
Replace control board AP1
Replace the
compressor
If malfunction is
removed?
If the stop time of compressor
is more than 3min?
N
If the stop time is not enough and the
high and low pressure of system is not
balance , please start it after 3min
Improve the connection situation
of control board AP1 and
compressor COMP, connect it
with wiring diagram
N
Y
N
If the refrigerant charging is
too much?
Y
Does the unit start
up normally?
N
Charge the
refrigerant according
to service manual
Y
Does the unit start
up normally?
N
Y
End