Gree GWH12UB-K3DNA4F Service Manual page 38

Service Manual
(5)Error 5: Dual-8 nixie tube of display board displays "H6".
Solution: The feedback wire of indoor fan has not been firmly connected to the controller or the indoor fan motor fails to work, please
reinsert the feedback line of indoor fan or replace the main board of controller, or replace the motor.
(6)Error 6: Dul-8 nixie tube of display board displays "FC".
Solution: It is malfunction of swing mechanism, which is caused by the looseness of connecting wire or damage of swing mechanism or
main board. Please reconnect the connecting wire, or replace the swing mechanism or controller.
(7)Error 7: Dul-8 nixie tube of display board displays "JF" or "rF".
Solution: It is abnormal of detecting board, which is caused by the looseness of communication line between the main board and
detecting board, or the malfunction of detecting board or main board. Please reinsert the connecting wire, or replace the detecting board
or controller.
8.Blockage protection to Motor
(1) When turning on the fan, the motor speed is not more than 300rpm/min for 1 min consecutively, it's blockage protection to motor.
(2)During lockage protection to motor, all load stop operation (indoor fan, outdoor fan, compressor, and electric heating tube stop
operation; 4-way valve should delay 2mins to stop operation and then horizontal louver will stop at the current position.
(3)Once there's blockage protection to motor, cut off the power to resume operation.
(4)During blockage protection to motor, remote controller and buttons are valid and they can turn on or turn off the unit, while they won't
perform detailed target (indoor fan, outdoor fan, compressor, and electric heating tube stop operation, and 4-way valve should delay
3mins to stop operation; horizontal louver will stop at current position).
(5)During motor blockage protection, if the unit is at on status, the dual-8 nixie tube displayed blockage error code H6; if the unit is at off
status, it won't display blockage malfunction information.
9.Communication malfunction
If the unit hasn't received correct signal for 3mins consecutively, it's the communication malfunction. Outdoor fan stop operation and stop
operation after blowing residual heat under auto heating mode or heating mode. Indoor fan operated at set fan speed under other modes.
10.Auto inspection function
Maflunction of jumer cap
After energization, when it's detected the jumper cap outlet is blank, it's the malfunction of jumper cap, which can't resumed. During
malfunction protection of jumper cap, if the unit is at on status, the nixie tube displays error code: "C5" and operation indicator is blinking.
If the unit is at off status, it won't display error code.
Note: The controller without this function won't detection this malfunction.
Technical Information
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