Gree GWH18AC-D3DNA1B Service Manual page 54

9.2.3.6 Diagnosis of overload and discharge malfunction (outdoor unit malfunction)
Indoor display: H3 (dual-8 display), heating indicator is off for 3S and blinks 3 times.
E4 (dual-8 display), operation is off for 3S and blinks 4 times.
Main detection point:
Is the electron expansion valve connected well? Is the expansion valve damaged?
Is there refrigerant leakage?
Is the overload protector damaged?
Is the discharge temperature sensor damaged?
Malfunction diagnosis process:
If the overload protector SAT is well
Under ambient temperature, test the resistance of overload of overload
protector with ohmic meter, resistance value is less than 1000
If the wiring terminal FA of electron expansion is well
N
Check if electronic expansion
valve coil is installed on the
valve body normally.
Replace
Check there is block for
overload
electronic expansion valve
protector SAT
Remove mulfunction?
Check refrigerant, if there is leakage,
please refer to specification
Remove mulfunction?
Check if the discharge temperature senor
is normal with temperature sensor
After the unit
de-energized
for 20min
connected?
Y
Y
connected?
Y
N
N
resistance value meter
Y
Replace outdoor
control board
Finish
51
Connect wire
well with wiring
N
diagram
Y
Y
Replace discharge
N
temperature sensor
Troubleshooting
N