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mookie's avatar
mookie
Explorer II
Sep 15, 2017

Dometic cooling fan not operating

My dometic refrigerator is cooling OK on gas but only to about 39 on electric. The cooling fan behind the refrigerator is not operating. It works if I jump it. Anyone have this issue ? Sensor? Electric board? Any suggestions would be appreciated. Thanks for any help

9 Replies

  • MY Dometic cools like yours. Always have. Added 2 additional fans. Although the freezer freezes well I have not had any issues with milk, etc going bad.
  • On a Dometic fridge, the power for the fan comes from a terminal block next to the board, not from the board itself. Before suspecting the board, check the fuses, there will be an external automotive style fuse as well as some under the cover. Also check the terminal block for 12 volt power.
  • Checked this morning and there is no power to the fuse for the fan. I am guessing the board needs to be replaced.
  • mookie wrote:
    I hot wired around the thermostat and the fan still did not run


    Is there power at the snap disc? if not, there is an inline fuse (cartridge fuse) in the positive line to the thermostat. need to chek it, I think it's on the blue wire on a Dometic. If the fuse is good, it's fan time. You can get a new one from DigiKey, Dell City Electronics of Flea Bay. I just bought 2 FDB (Fluid Dynamic Bearing) 120 mm muffin fans from Flea Bay for 20 bucks, shipping included.

    FDB fans are completely silent in operation. I replaced my single fan with the pair for more airflow (and better heat transfer / cooling.
    • tedryan's avatar
      tedryan
      Explorer

      on some units they put a snap disc on the pipe between the first set of fins....that failed the design....now they want it somewhere else,,,near that set of fins,,,,the on point should be 130 degrees....amazon has that....important to remember...ammonia boils  and issue arise with over boiling,,,then you have to stop and remove the unit....turn it upside down for a night or so.....then install a new snap disc on the fins .....best place is near the original site.....on the fins or attached at that location...how you do it is to catch the heat to turn on the fans.....I put a secondary switch on the front of the eyebrow to manage just in case.....they are connected with a 1 amp fuse to the snap disc and a bypass wire to the fans....they messed up on the design....and the thermistor for some units cost a 120 bucks or so....so if it tests ok....you can ask gemini on specs....do not mess with that because on some units it snaps on to the ciricuit board and is  now very rare to get...DOMETIC 2951380514 SENSOR COMPLETE....so....just assume the circuit board is ok....change out the snap disc etc....turn it upside down to move the ammonia blockage to the right location in the system.....its a distillery...short answer,,,

       

  • CORRECTION I hot wired the fan directly and it is working. Fuse is good also
    • tedryan's avatar
      tedryan
      Explorer

      do both, add switch to manage around the snap disc

       

  • It's a snap disc thermostat and it' should be on an outboard fin of the upper evaporator in the rear fridge cavity. Chek for power there and it if has power but the fan isn't coming on, it's probably shot. Amazon has them cheap and you can get an adjustable one pretty cheap as well.
  • Assuming your frig is in a slideout then there should be a thermostat behind the upper grill entry. It is attached to the cooling fins. You can test for power at this point. Since temp. Is cooler the fan cooling may not be turning on. Modified vent or adding a fan that operates at lower temperatures might be necessary to get your refrigerator temp down. Several good mods on YouTube.com.

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