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We have a roof top mount cetral heating & air unit and its a day& night unit it will blow air out but not cold air .went on top of roof to check condencer and it is hot and coils are normal temperture i could here a noise in the condencer turning off and on.

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Sounds like the compessor over load is cliking on&off compressor not starting could be a capacitor or compressor or if your lucky a contactor dan

Posted on Jul 18, 2008

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I have a 2006 Gulfstream Cavalier 8'x 32' Fema Travel Trailer with a Dometic Duo Therm AC unit which I have recently replaced the fan motor on. Had the dealership bench test motor prior to lea


There is ice forming on the evaporator coils. This is either from a low freon charge or a leak in the seals or windows and doors. Could also be that the drains are not working and water is building up and freezing

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I have a Dometic Duo Therm rv Roof Air Conditioner Model# 59516.531.The fan is blowing and the compressor is kicking on but it is not blowing out cold air. Someone said it must be out of freon. Why would...


These are a closed system.(meaning that there is no fill valves for recharging) But a heating & cooling technician can solder them on and re-charge the system. Only problem there is to get an estimate up front, and compare it to buying a new roof unit which also comes with a new warranty, as well as keep in mind that the freon went somewhere, so there is an obvious leak that will need to be addressed as well. Most times it's wiser and cheaper in long run just to buy a new roof unit.
Are you sure that the compressor is kicking in? Did anyone remove cover on roof and check lines from compressor to see if any cooling is occurring?
These don't often leak, that's why I'm asking. Any idea how old the unit is?
Perhaps in fairly new, it's a warranty issue.

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We have an air make up unit on our community hall with no heat


Depending on the outdoor temps, 10 kw won't heat much. If you have a multi-meter you can check the amp draw as well. You should get 20 amps for each heat strip. Each heat strip is 5kw.

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Have roof top air conditioner that blows air but soon trips breaker. any suggestions? Henry


check the condensor fan in the rooof unit. It's the fan blowing on the cpil on the roof.. If it failed, the head preasures can becme excessive andwork the compressor hard causing the breaker to trip. Let me know and good luck, Ned_

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1 Answer

Only at night the unit runs fine day-time it short cycles and will shut completely down and restart not just compressor the whole thing


Has anyone cleaned coils inside, as well as taken cover of on roof & done the same? If you remove inside filter etc, and look way up in front with a flashlight, you'll see coils that need cleaning usually. I use a shop vac with brush & long extension. Tight fit near top, but can be done, without damaging coils. Then take cover off on roof unit (with breaker shut off ) & clean both sides of rear fins, as well.

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It is entirely possible that a five minute test would not produce any noticeable amount of water. Turn off everything in the house that is using electricity and your 20 AMP service will be sufficient to run your AC.

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heat pumps don't work as effient at that temp thats why they have 2nd stage supplemtial heat

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1 Answer

My carrier air con is only blowing cold air and i need the hot


It sound like the heating sequecer maybe have gone bad on the fan coil unit that you have. You need to call the maintenance personnel that does the work where you live or a service company out to repair the unit because since y0u only rent it is their responsibility to provide youp with heat and if by chance that you have a heat pumo unit then you definately want them to get on the roof to fix the problem. Remember to always change oyur filter inside when ever you get your electric bill because even though it's theeir unit it's your electric!

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