Gree GWH07AWAXA-K6DNA1C

99
Installation and Maintenance
Service Manual
Error
code
Malfunction name AC status Possible causes
Undefined outdoor unit er-
ror
Cool: compressor and outdoor
fan stops operation, while indoor
fan operates; Heat: compressor,
outdoor fan and indoor fan stop
operation.
1. Outdoor ambient temperature exceeds the operation range
of unit (e.g.: less than 20°C or more than 60°C for cooling; more
than 30°C for heating);
2. Are wires of compressor not connected tightly?
3. Failure startup of compressor?
4. Is compressor damaged?
5. Is main board damaged?
Communication malfunc-
tion between the drive
board and the main board
Cool: compressor and outdoor fan
stops operation; Heat: compressor
and outdoor fan stop at first; about
1 minute later, indoor fan stops op-
eration;
1. The drive board is damaged;
2. The main board of outdoor unit is damaged;
3. The drive board and the main board is not connected well.
Circuit malfunction of mod-
ule temperature sensor
Cool/Dry: compressor stops opera-
tion, while indoor fan operates;
Heat: all loads stops operation.
Replace outdoor control board
Module overheating pro-
tection
Cool: compressor stops operation,
while indoor fan operates; Heat: all
loads stops operation.
1. Air inlet / air outlet of outdoor unit are blocked by filth or dirt;
2. Condenser of outdoor unit is blocked by filth or dirt;
3. IPM screw of main board is not tightened;
4. Main board of outdoor unit is damaged;
Malfunction of ambient
temperature sensor of
drive board
Cool: compressor, outdoor fan and
indoor fan stop operation; Heat:
compressor and outdoor fan stop
operation at first; about 1 minute
later, indoor fan stops operation.
1. The ambient temperature sensor of the drive board is not
connected well;
2. Malfunction of the ambient temperature sensor of drive
board.
DC bus voltage is too high
Cool/Dry: compressor stops opera-
tion, while indoor fan operates;
Heat: all loads stops operation.
1. Measure the voltage between position L and position N on
the wiring board (XT). If it’s higher than 265 VAC, please turn
on the unit until the power voltage is decreased to the normal
range;
2. If the AC input is normal, please replace the outdoor control
board.
DC bus voltage is too low
Cool/Dry: compressor stops opera-
tion, while indoor fan operates;
Heat: all loads stops operation.
1. Measure the voltage between position L and position N on
the wiring board (XT). If it’s lower than 150 VAC, please turn
on the unit until the power voltage is increased to the normal
range;
2. If the AC input is normal, please replace the outdoor control
board.
Charging malfunction of
capacitor
Cool/Dry: compressor stops opera-
tion, while indoor fan operates;
Heat: all loads stops operation.
See “Charging malfunction of capacitor”
Malfunction of RF module
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 connection wire of RF module is not connected well.
2. Malfunction of RF module;
Phase current detection
circuit malfunction of
Cool: compressor and outdoor
fan stops operation, while indoor
fan operates; Heat: compressor,
outdoor fan and indoor fan stops
operation.
The control board is damaged
Lost phase protection 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. The compressor is damaged;
3. The connection wire of compressor is not connected well.