Thetford N3000 fridge 12 volt problem

Mobilvetta

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Hope someone can point me in the right direction, when the engine is running usually the fridge runs on the 12 volt supply, but it's flashing with error code 6.

I've tested the power supply going to the PCB with the engine running and it's getting power of 13.3 volt on the engine run terminals, plus the LC12vdc is also reading 13.3 volts but I have noticed scorching marks on the HC12 terminal and there was no power when tested with multi meter. Does anyone know what purpose the HC12vdc serves please, as anyone else come across this problem?
 

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I've found the problem, the 20amp fuse had shorted out on the PCB board, replaced the fuse and it is working again, resoldered the joints.
 

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