Question about Dometic Rooftop RV Air Conditioner

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My a/c will not work with furnace removed...since i dont camp in cold weather, how can i connect the circuit so my air will work?

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  • Ken Bledsoe May 11, 2010

    The a/c is the one over head right? Do you have a central thermostat that controls both?

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Without a blower for the evaporater coil t cant pick up enough heat to do its job.

Posted on Mar 12, 2009

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1 Answer

Fan and Light will not work in cold weather (under 45 degrees or so)


Cold weather may be making the lubricant too thick and impeding the motor from turning. On a cold day see how easy it is to spin the fan.

It could also be the switch is worn to the point that the cold weather causes the metal to contract then it does not have enough strength to snap into the closed position. Cold weather can also cause failures in electronic circuits or even a wire connection that is not quite tight enough.

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Heat and Air run at the same time in my rv


yes, replace your stat but also make sure your wire going to y on the stat has not shorted with the wire going to the w on your t-stat. To check to make sure remove the t-stat and short the wire going to r to the y wire and the wire going to the g terminal if it has that. if cooling works with no heat it's more than likely in the stat, if heat comes on then you may have other wiring, circuit board issues

Mar 01, 2013 | Heating & Cooling

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I have a weather king model 90RJ - first time I've had hot air heat..When I turn on the heat, the blower turns on right away ( blowing cold air) - I understand that the ducts have to cleared of the cold...


When the furnace first comes on there is a induced draft motor that should come on first but that forces air up the exhaust or flue,not into supply air on ductwork. It is not unusual for cold air to be blown out when burner first turns blower motor on. This should last for a short period of time, no more than a min. or two. You can watch furnace cycle by removing top front cover, I should back up here and ask is this a gas or electric unit. If it is gas you should be able to watch burner flames for a short time before blower comes on. I really need more information so I can try to ascertain what is going on. Wish I could be more help. Thank you.

Nov 12, 2010 | Weather King 10AJA3001AH Air Conditioner

1 Answer

Furnace won't work because of a loose Inducer Motor Connector


Cut power to the system at the main disconnect.
Turn the gas off at the unit.

remove the panel, andsee if the stakon conection is intact. Chances are its just a loose connection from your description.

If the problem is not obviose, let us know what you did or did not find.

Dec 04, 2008 | Heating & Cooling

1 Answer

How do i operate thermostat and furnace


if your furnace is on 24 hours straight, before it heats up your home, then either your cold weather and indoor temps are extreme, or your unit is grossly undersized. if however your furnace cycles on and off when the temp is still way colder than you have set it you have either a bad stat that thinks its hotter than it is, or a bad furnace problem and even though the furnace is getting a signal from the stat to heat it is failing to do so. you'll have to watch and think this through to isolate the problem. if you set the furnace to max heat and it runs and heats the house reasonably quick then its probably going to be a bad stat. if you set it to max heat and it shuts off way before it gets to setpoint then the problem is in the furnace. be sure filters are clean, blower wheel is clean , returns are no obstructed, etc. if you by chance have an old mercury bulb stat they had a thing in them called a heat anticipator which basically worked like this. a dial with a little pointer determined how soon it would be till the furnaced reached the desired temp and anticipated how soon to shut off the burners in anticipation of the cool down period so you dont overshoot the desired temp. if these are bad or moved to different setting they can short cycle the furnace on of on off etc. or shut down the burner almost as soon as it lights. setting is usually at .4 to .6 on most, but really a digital stat is only way to go. by the way check to be sure you don't have a hot air supply grill blowing directly on the stat or it will shut off as soon as stat gets hot and rest of house will be cold. usual location is 5 feet off floor directly over the main return air grill or under it as the case may be. good luck

Nov 10, 2008 | Weather King 12AJA6001AH Air Conditioner

1 Answer

Fan won't come on, either when heater or air-conditioner is turned on.


you have lost all control voltage. that is generated in the furnace. either the transformer has failed or the fuse in the transformer board has blown or the circuit breaker to the furnace has tripped or you have an open circuit to the furnace in the high voltage wiring. grab a volt meter and start with checking high volts at the furnace and back to the panel. if you have volts then start checking to see if transformer is generating low volts. as a side, if this is a furnace be sure the door is on secure and the door safty switch is depressed or guess what! no fan no volts no nothing. if any lights on board are flashing etc then you have power and it becomes a control problem. be sure your low voltage is getting sent to the stat via red and common on the furnace terminal board. good luck

Oct 30, 2008 | Goodman CKL24AR24 Air Conditioner

1 Answer

13500 unit will not come on year 2000


Assuming you have central air (controlled by a wall thermostat), chances are the control unit in the A/C was hit by the thunderstorm. These are fairly common to be ruined by power fluctuations and bad weather as is the control unit in the refrigerator. The controls unit "runs" both the cooling and heating. If you ever notice right before your furnace turns on, there is a clicking noise in the A/C. Thats the control unit. It tells what "system" to turn on They are not cheap. They are about $150-200. The best thing you can do is unplug your unit when not in use. I have replaced TONS of control boards, etc. because people leave their unit plugged in and they have been hit by bad weather. Good luck and happy camping.

Jun 18, 2008 | Dometic Rooftop RV Air Conditioner

1 Answer

What part do we replace first?


Door safety switch. You are sure you have power to furnace? jump out the G and R terminals on the furnace control board or turn your thermostat to Fan On to check. Make sure the door safety switch is in the closed position. Fan should come on. No fan, no power to unit. Check Emergency switch, circuit breaker and there may be a fuseable link in the wiring somewhere either above the unit or a condensate safety switch. Get power to the unit. Also check to see if there is a small fuse in the wiring inside the furnace or on the circuit board.

Jan 22, 2008 | Weather King 12AJA4801AH Air Conditioner

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