Toyotomi GAN-A180GVR Service Manual page 51

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