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You need to unplug the heating element from the circuit board and using a digital multi meter check the ohms. You should read approximately 44 ohms +/- 10%. If it is out of range change the heating element.
If your freezer is getting down close to zero degrees (F) then I doubt that your refrigerant is low. The most common cause of the refrigerator section not getting cool (approximately 40 degrees (f)) is a fan that pulls the coils in the freezer into the refrigerator has failed. A very common failure of a cheep little fan motor. Normally that fan is behind a panel in the freezer section at the bottom. Determine where the cold air in the refrigerator section normally enters and the fan will be above there.
I suggest the main control board is faulty because of the spike. The voltage would have damaged some of the control circuit - even though the fuses did not blow. Sounds like a memory fault on a control chip.
Sounds like the defrost timer is not tracking the time properly. The unit needs to defrost once every 6-8 hrs. in order to work. Make sure the inside (evaporator) fan is running ok. If it rund for a few days and then warms up in the refrigerator section (coil iced), then the defrost timer is the culprit.
cooling unit is bad my friend there is a temporary fix but in my opinion not worth your time take the unit out and flip the refer upside down this sometimes dislodges the blockage in the cooling unit all a rv fridge is is amonia and salt if not used all the time the salt crystalizes in the orfice and blocks the unit a rebult cooling unit 550 about and labor 4 hours at your dealers rate a new fridge about 1500 installed
my shop 360 for labor 550 about for unit 910
I ALLWAYS RECOMEND REPLACING THE FRIDE COMPLETLTY
you get all new electronics and a new box
I had the same problem , you have to clean your freezer compartment out completely and take the covers off the inside back of the freezer being carefull not to break any wires, then defrost the cooling module by hand hot water towels messy job.
Make sure the cooling sensor is attached in the right spot and hasn't fallen down, it has a plastic holder it clicks into.
once clean and defrosted put back together and it will be fine...
Try not to put any frozen chip bags or peas etc right at the back of the freezer this causes the cooling system to freeze up.
How the system works it blows cold air from the freezer compartment down to the fridge to cool it and when the system freezes up no cold air to fridge ,hense the problem you are having...
If you are not confident in doing the job you can call a fisher and Paykel tech and they will charge you $150 to do the job.