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Ron Pyne Posted on Aug 22, 2019

My Dometic rooftop unit Blowing outside air, not cold air. What's wrong?

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Tom Palicke

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  • Contributor 7 Answers
  • Posted on Aug 22, 2019
Tom Palicke
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Joined: Apr 11, 2019
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Need to go up there and give more info. Look for outdoor fan...Is it spinning? Compressor on? Could be dual capacitor as they are 50% of problem lately

5 Related Answers

Anonymous

  • 6 Answers
  • Posted on Jun 02, 2009

SOURCE: uotside unit blowing cool air but hot on the inside

It sounds like you have a unit called a heat pump. When a heat pump unit is in cooling mode the outside unit blows hot air and the inside unit blows cold air. If the outside unit is blowing cold then the indoor unit is most likely blowing room temperature or warm air. It sounds like the thermostat could be controlling incorrectly or you could have a failed reversing valve which is the device that switches the unit from heating to cooling mode.

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Anonymous

  • 30 Answers
  • Posted on Jul 18, 2009

SOURCE: panasonic air con unit is not blowing cold air out.

This unit is use in motels etc. Check the ouside coil ( conderser) from the inside (discharge fan ) for dirt. Most of these units are floor level . This can cause a unit to short cycle ( cold air is at the floor) .

christian nielsen

  • 358 Answers
  • Posted on Aug 30, 2009

SOURCE: AC unit outside blowing out cold air, vents

If you have a heat pump probably there's a wrong connectionin the thermostat, but if is not a heat pump ,the compresor is not working or the unit leaked all the refrigerant.

Testimonial: "thank you, we have had a problem in the past with refrigerant leaking, was supposed to be fixed"

Sparky2012

Sergio Shamshoian

  • 102 Answers
  • Posted on Dec 04, 2009

SOURCE: my ptac is not blowing hot air only blows warm air

freon is low or outside is very cold

motor1258

Mike Butler

  • 6674 Answers
  • Posted on Jun 05, 2010

SOURCE: Rooftop RV Air Conditioner: replaced capacitor on dometic 59516-531 steal trip...

You need to borrow a clamp on style amp gauge, and check amp draw on black wire in box where hydro wires connect. (PLEASE, be careful, and if not experienced in this type of test, don't try it, due to likelihood of getting a shock. ) If it's the compressor kicking in that's causing the breaker to trip, and capacitor is good, then it's usually a problem with either low incoming (supply) 110-120 AC voltage, which will cause high amperage draw, or compressor on it's way out causing high amp draw. If it's only drawing 15-18 amps, and your tripping a 20 amp breaker, then breaker is getting weak.

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My Dometic Rooftop 15000 BTU Model 459516.701CO will come on and run and then shut off it continues to cycle within minutes of shutting off it is controlled by a Dometic Comfort Control Center 2...

THE OUTSIDE FAN MOTOR MIGHT NOT BE WORKING CAUSING THE COMPRESSOR TO GET HOT AND TRIP THE INTERNAL OVERLOAD IN THE COMPRESSOR - IF THE UNIT IS LOW IN FREON SAME RESULTS - WHEN UNIT IS FIRST TURNED ON DOES IT BLOW COLD AIR OR DOES THE AIR NOR FEEL COOL - JUST COOL AIR COULD BE LOW FREON - COLD THEN WARMS UP IS FAN PROBLEM
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Ac not blowing cold after outside temp reaches 98 degrees

Sounds like you have dirty condenser coils. Remove the upper shroud and check the condenser for clean. Take a water hose and gently spray out the coils paying special attention not to bend the coils over with too much pressure. This will allow more air movement through the coils and give you better cooling efficiency.

Hope this helps,

Jeff
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No cool air!

if it starts blowing when you turn up the thermostat, but dont get any cold air most likely the coolant leaked of, call a repair person
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Dometic AC that the fan shuts off but the compressor keeps running

call dometic dealer. I hear they have a bad circuit board that is replaced.
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Carrier air-v AC is not blowing cold air

There could be a freon leak, or just low freon levels. If this is the case, you have to call a certified a/c technician to recharge your system.
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Try having a professional check that the collant lines have not perished. Also have them check the thermostat and that there is actually gas in the system. The warm air suggests that the unit has no gas.
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No Cold Air

Have you removed inside filters and cleaned them? have you gone up and removed the cover to see if fins are dirty, or perhaps wasps etc. Does fan only have one speed on thermostat. Does fan run faster on fan only operation? Is it tripping your breaker at all?
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