Friedrich FSHW091, Service And Parts Manual

Page: 130 / 171

130 PB
TROUBLESHOOTING
Diagnosis of losing synchronism for compressor
(AP1 below is control board of outdoor unit)
● If the system pressure is over-high?
● If the work voltage is over-low?
Malfunction diagnosis process:
If the compressor wire COMP(UVW) is well
connected, the connection sequence
forwards to clockwise direction?
Check if the fan
terminal OFAN is
connected well
Replace
compressor
If the outdoor fan works
normally?
3min
If the stop time of
compressor is more than
Synchronism after
and start it
energize the unit
Connect
wire well
Synchronism
occurred during
operation
Replace
control board
AP1
If the radiating of unit is
well?
Remove
malfunction?
Replace fan
capacitor C1
Improve the radiating
of unit (clean heat
exchanger and
increase ventilation)
Replace
outdoor fan
Y
N
N
Y
Y
N
Replace
control board
AP1
Remove
malfunction?
Replace
compressor
Y
N
N
Y
Start to run until the
power resume normal
voltage
N
Charge the
refrigerant with
service manual
Y
N
If the input voltage of unit
is normal?
Y
If the refrigerant is too
much?
N
Y
End
End