Gree GWH07AWAXA-K6DNA1C

98
Installation and Maintenance
Service Manual
Error
code
Malfunction name AC status Possible causes
Outdoor condenser tem-
perature sensor is open/
short-circuited
Cool/Dry: compressor and outdoor
fan stop operation, while indoor
fan operates;
Heat: after operating for 3 minutes,
all loads stops operation.
1. Temperature sensor is not connected well or damaged;
2. Temperature sensor wire of outdoor unit is damaged; short
circuit between the temperature sensor and copper pipe or
outer case;
3. Main board of outdoor unit is damaged.
Outdoor air discharge
temperature is open/short-
circuited
Complete unit stops operation; mo-
tor of sliding door is cut off power.
1. The exhaust temperature sensor is not connected well or
damaged.
2. Temperature sensor wire of outdoor unit is damaged; short
circuit between the temperature sensor and copper pipe or
outer case
3. Main board of outdoor unit is damaged;
Malfunction of micro switch
Cool/Dry: compressor stops opera-
tion, while indoor fan operates;
Heat: all loads stops operation.
1. The sliding door is blocked;
2. Malfunction of the photoelectric inspection panel of sliding
door;
System is abnormal
Cool/Dry: all loads stops operation
except indoor fan;
Heat: all loads stops operation.
See “High temperature prevention protection; high power; sys-
tem is abnormal”
Desynchronizing of com-
pressor
Cool/Dry: compressor stops opera-
tion, while indoor fan operates;
Heat: all loads stops operation.
See “Desynchronization diagnosis for compressor”
PFC protection
Cool/Dry: compressor stops opera-
tion, while indoor fan operates;
Heat: all loads stops operation.
1. The power grid quality is bad; AC input voltage fluctuates
sharply;
2. Power plug of air conditioner or wiring board or reactor is not
connected reliably;
3. Indoor and outdoor heat exchanger is too dirty, or air inlet/
outlet is blocked;
4. Main board of outdoor unit is damaged.
Demagnetization protec-
tion of compressor
Cool: compressor and outdoor fan
stop operation; Heat: compressor
and outdoor fan stop operation at
first; about 1 minute later, indoor
fan stops operation.
1. The main board of outdoor unit is damaged;
2. Compressor is damaged;
Communication malfunc-
tion between indoor unit
and inspection board
Normal operation
1. Poor connection between the indoor unit and the inspection
board.
2. The main board of indoor unit is damaged;
3. The inspection board is damaged;
Malfunction of humidity
sensor
Compressor, outdoor fan and
indoor fan stop operation;
The inspection board is damaged.
High power protection
Cool: compressor and outdoor fan
stops operation, while indoor fan
operates.
See “High temperature prevention protection; high power; sys-
tem is abnormal”
Start-up failed
Cool/Dry: compressor stops, while
indoor fan operates; Heat: all loads
stops operation.
See “Malfunction diagnosis for failure startup”
Lost phase
Cool: compressor and outdoor fan
stop operation; Heat: compressor
and outdoor fan stop operation at
first; about 1 minute later, indoor
fan stops operation.
1. The main board of outdoor unit is damaged;
2. The compressor is damaged;
3. The connection wire of compressor is not connected well.
Over-phase current protec-
tion of compressor
Cool/Dry: compressor stops opera-
tion, while indoor fan operates;
Heat: all loads stops operation.
See “Overload protection of compressor , High discharge tem-
perature protection of compressor”