Hello All,
I have a split air conditioner which has just decided to stop working. It had worked the day before. The unit was marketed as Airforce, model number GWHD12B2NK3AB as sold by B&Q several years ago.
The outdoor unit circuit board is a GREE, board number GRJW9M-A1 V2.31.
What I am interested in knowing is the method of data communication between indoor and outdoor unit. Is it a pulsed voltage or a standard protocol? The signal is received by a set of opto-isolators on the outside board and then sent to the microprocessor on that board. I would guess that information from the outside unit is sent to the indoor unit in an identical manner.
Any advice on the communication protocol would be gratefully received.
Regards