[northy303]

your fridge has turned into a freezer cos the compressor is not shutting off when it gets to temp so It is a sticking thermostat relay, they are about 10 pounds on ebay unless it is a control board where the thermostat plugs in to then you will have to change the board and thermistor

[northy303]

If thermistor is short or open line- New thermistor required
If no power at control board – New inverter board required
If no power at signal connector on inverter board but power at control board- New control board required
if power at signal connecter on inverter board but no balanced ac output on 3 leads going to compressor when unplugged from compressor-New inverter board required.
if all these readings are ok then you have a seized compressor- New compressor required

[northy303]

just checked that compressor and the inverter board gets its signal from the control board somewhere else in your fridge this has the thermistor plugged in to it probably where you turn the temp up and down. I would check to see if the thermistor is ok first and has not shorted out with the power surge.
then check the control board to see if it is receiving voltage and sending the signal to turn on the compressor. It is plugged in to cn05 on the inverter board which is your tx and rx and is the white and brown cable plug (brown being the live) then if all that is working then you need to unplug the compressor, turn the unit back on and see if you have a balanced output from the inverter board pin to pin on the plug (3 readings) ac voltage should all read the same.Then last of all check if your compressor is not down to earth and measures the same resistance pin to pin. obviously I Hope you can use a multimeter.
Good luck.

[northy303]

Do you have the wiring diagram for the unit and I will tell you what to check. I don’t think you have an inverter they are usually on bigger fridges and aircon systems

[northy303]

hi
the buzzing you hear is coming from the compressor when it tries to start. You will then usually hear a click meaning it has gone out on overload.
It is either the start capacitor and relay or the compressor itself you can check the capacitor and relay with a multimeter and if faulty just replace them and see how you go as they are cheap to buy just make sure you get the same uf capacitor. If the new capacitor doesnt get the compressor going then the compressor is seized and will need replacing.

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