Question about Dometic Rooftop RV Air Conditioner

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No air blowing through ducts

I replaced filter in furnace, and vacuumed all dust particles. central air kicks on, and so does the unit outside. After I replaced the filter in the furnace the air was circulating for about an hour. after that nothing again. please help

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If the inside fan motor is still running but you have no air flow it could be low refrigerant charge, dirty evaporator coil, or just leaving the temperature set point to low over night when it was cooler outside, causing the evaporator to freeze up stopping the air flow. Once the evaporator coil has started to collect ice it must be completely defrosted before the problem can be corrected.
Example, It could be that your coil froze due to a dirty filter, which you have now replaced, but the evaporator coil has not had a chance to completely defrost.
I would turn off the A/C but set the fan to on for at least four hours, if you can see the drain from the unit wait until not even a drop of water is coming from it. Then turn the A/C back on and check it, it is important to leave the A/C off the full defrost time, if it is turned on even for a few minutes at a time it will never defrost.
After you restart the A/C if it cools ok for a while then does the same thing again it is probably low refrigerant charge and you should have a service company check it.

Posted on May 22, 2009

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