Friedrich FSHW091, Service And Parts Manual

Page: 132 / 171

132 PB
TROUBLESHOOTING
18-24k Diagnosis of overload and discharge malfunction
Diagnosis for overload and discharge malfunction (AP1 below is control board of outdoor unit)
Main detection point:
Malfunction diagnosis process:
● If the electron expansion valve is connected well? Is the expansion valve damaged?
● If the refrigerant is leakage?
● If the overload protector is damaged?
Connect wire
well with wiring
diagram
Replace EKV
coil of electron
expansion valve
Remove
malfunction?
After the unit
for 20min
de-energized
Remove
malfunction?
The resistance value of
firs t 4 l ead fo ot an d th e
fif th lead foot is similar,
less than 100
Y
If the wiring terminal FA of electron
expansion is well connected?
Y
N
N
N
If the overload protector SAT
is well connected?
N
Under ambient temperature, test the
resistance of overload protector with ohmic
Y
Replace
overload
protector SAT
N
Y
Replace
Check refrigerant, if there is
leakage, please refer to
specification
control board
AP1
End