Toyotomi GAN-A180GVR Service Manual page 52

(7) Diagnosis for overload and discharge malfunction (AP1 below is control board of outdoor unit)
Main detection point:
If the electron expansion valve is connected well? Is the expansion valve damaged?
If the refrigerant is leakage?
If the overload protector is damaged?
Malfunction diagnosis process:
N
Replace
overload
protector SAT
After the unit
de-energized
for 20min
If the overload protector SAT
is well connected?
Y
Under ambient temperature, test the
resistance of overload protector with ohmic
meter, resistance value 1000
Y
If the wiring terminal FA of electron
expansion is well connected?
Y
The resistance value of
first 4 lead foot and the
fifth lead foot is similar,
small to 100
Replace EKV
coil of electron
expansion valve
Remove
mulfunction?
N
Check refrigerant, if there is
leakage, please refer to
specification
Remove
mulfunction?
N
Replace
control board
AP1
Finish
N
Connect wire
N well with wiring
diagram
Y