Air Conditioning Camping Dometic Freshlight B2200

[QBAelectric]

Roof air conditioner with caravan.
Mainboard failure after mains overvoltage.
The varistor and the elka for the inverter were damaged.
The inverter works, most elements replaced and checked.
The problem persists, he can't attach it. It responds to the remote control but does not turn on the transmitters. 5V and 12V present. It reacts to a voltage of 2 temperature sensors signaling with a red diode. From stand-by mode (orange LED), it does not go into operation mode, only the green LED started for a moment.

I suspect a program defect in Motorola HC908AP16 or eeprom 24c16.

Has anyone dealt with the repair of these types of modules?

Module as on the photo.

I don't have eeprom content to compare. A processor is available for purchase, but a processor without content will not help me much.

PNC 958500167
9102500165

[Dominash]

Yeah, this one is a bugger. I know a few friends from Queensland who left it to a good company that fixed such models. Have you tried the same yourself? He didn't have that big of an issue like yours, though, but I still remember him describing all the filth that the guys from https://supremeductcleaning.com.au/ were able to pull off from his HVAC filters. It sounded crazy to me, however, there are many occasions where AC and HVAC systems malfunction if they are not maintained accordingly! Maybe you can try this approach yourself!