The fridge problem started last summer, and since it still cools and runs (could be used) the problem have not been fixed until now. The issue was that I just runs and runs until the battery’s was empty. So I changed to a new Waeco thermostat. But it was still behaving the same. Next thing to replace then would be the fridge controller unit and would cost around 300euros to buy as new spare part. A new fridge around 600+euros.
Instead I bought a 20euros universal digital temp controller and wired it in, replacing the old mechanical thermostat. It now works great, keeps the temperature more stable and uses less energy. I can even see the present temp inside the fridge on the display, and I can now change temp settnings without open the fridge door (and letting all cold out). If you have the same problems with your Waeco or Dometic 12v fridge I can really recommend to upgrade to a digital thermostat instead ? I also added a extra computer fan for better ventilation inside the cabinet on hot summer days, compressor will be happy 🙂
