Gree GWH07AGA-K3NNA1B Service Manual page 45

Zero-crossing
inspection
circuit
6
malfunction
of the IDU fan
motor
Lack of
refrigerant
or block
protection for
the system(not
7 applicable to
residential air
conditioner)
or Overload
protection
compressor
Overcurrent
protection
8
High pressure
9 protection of
system
Overload
10 protection for
compressor
42
Operation of remote controller or control
U8
panel is available, but the unit won't act.
The Dual-8 Code Display will show F0
F0
and the complete unit stops.
Cool/Dry: compressor and outdoor
fan stops operation, while indoor fan
E5
operates;
Heat: all loads stops operation.
E1
H3 The entire unit stops.
1.Quick de-energization and energization. Wrong
judgement by the controller because the electric-
discharging of capacitor is slow.
2.Zero-crossing inspection circuit of main board for
controller is abnormal.
1.Refrigerant leakage;
2.Indoor evaporator temperature sensor works abnormally;
3.The unit has been plugged up somewhere;
4.The compressor can't be started up normally. Because
the power voltage for the complete unit is too low, and the
outdoor working condition is too high.
1.Power voltage is unstable;
2.Power voltage is too low;
3.System load is too high, which leads to high current;
4.Heat exchange of indoor unit is too dirty, or it blocked the
air inlet/outlet;
5.Fan motor operation is abnormal; the fan speed is too
low or not functioning;
6.Compressor is blocked;
7.The internal system is blocked; (dirt blockage, ice
blockage, oil blockage, angle valve is not completely
opened)
8.Main board of outdoor unit is damaged.
1.Heat exchange of outdoor unit is too dirty, or it blocked
the air inlet/outlet;
2.Ambient temperature is too high;
3.Is power voltage normal; (three-phase unit)
4.Refrigerant is too much.
5.Wiring of high pressure switch is loose or high pressure
switch is damaged;
6.The internal system is blocked; (dirt blockage, ice
blockage, oil blockage, angle valve is not completely
opened)
1. Outdoor and indoor heat exchangers are too dirty or the
air inlet/outlet is blocked.
2. Fan motor is not working Abnormal fan speed; fan
speed is too low or the fan doesn't run.
3. Compressor doesn't work normally.Strange noise or
leakage occurs.Temperature of the shell is too high.
4. System is blocked inside(dirt block, ice block, oil block,
Y-valve not fully open).
5. High pressure switch is abnormal.
6. The refrigerant is leaking and cause overheating
protection to compressor.
Service Manual
Installation and Maintenance