Question about Dometic Rooftop RV Air Conditioner

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Front unit high cool and high fan not working

The high cool and high fan does not come on now. However it sounds like the compressor on high cool does come on. Or at least it sounds like it does. Sounds like a hummm. It kicks on a minute or so after I turn on the high cool. But that is all it does. Low cool seems and low fan seems to work fine. Rear unit is working fine

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  • gitzit1 Jun 25, 2008

    Do you think it could be the fan capasitor?

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I would recommend you take this unit to an RV service center. The issue could be due to many variables. It could be something as simple as the controller board relay or a low freon level. You may also be able to call a regular home heating and airconditioning shop to take a look at the unit. Keep me posted and if you found this solution helpful please rate it when you get a chance. Good Luck - Tech101

Posted on Jun 25, 2008

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Just replace the fan ..... its seems there is some voltage problem

Posted on Jun 25, 2008

  • gopinath pasupathy Jun 25, 2008

    if your fan replacement does not work .........it looks like a control problem with the thermostat or relay board (if you have a wall mounted thermostat). If the compressor is coming on, then you need to look into the airflow of the unit. Whether or not the compressor is coming on, you need to check the voltage. Like every appliance on board, the air conditioner needs adequate power to operate. If the voltage is 110 volts a.c. or below, the effectiveness of the unit will start to suffer. After verifying correct voltage, we need to look at how the air conditioner does it's job- it requires adequate air flow over both the inside (evaporator) and outside (condenser) coils. If the air filter is clogged refrigerant will not be able to pick up enough heat from the inside air, and if the condenser coils are blocked by leaves, it will not be able to give off enough heat to the outside air.

  • gopinath pasupathy Jun 25, 2008

    also check this

    the evaporator coils probably need cleaning . These can be seen when you remove the air filters, and possibly the inside air box. Likewise, the condenser coils can be seen after removing the upper shroud.

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