Question about Dometic Rooftop RV Air Conditioner

1 Answer

Fan comes on but no ignition (sometimes

Turn up the thermostat, and normaly you will hear a click from the ignighter and the furnace starts. Other times NO click and the fan just blows cold air

Posted by Anonymous on

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1 Answer

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  • Dometic Master
  • 1,363 Answers

Sounds like relay moodule or faulty cable between it and t-stat.

Posted on Aug 16, 2015

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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meBNme
  • 334 Answers

SOURCE: RV pilot light goes out

replace the thermocouple/flame sensor and make sure the flue/exhaust is clear and not getting wind gusts in it blowing out the flame.

Posted on Mar 06, 2009

  • 68 Answers

SOURCE: My Dometic 620315 Penguin roof a/c does not produce cold air.

If the compressor is running with no cold air the unit is more than likely no good. It can not be recharged. you need a new unit. If the compressor is not running you need to check the capacitors.

Posted on Mar 19, 2009

  • 4 Answers

SOURCE: 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.

Posted on May 19, 2009

motor1258
  • 6674 Answers

SOURCE: I have a DuoTherm BriskAIr 13.5K BTU. The Dometic

If you look at control box at roof unit, they usually use a separate set of wires for furnace. See what colors they are attached to at harness to thermostat. Some just follow other harness, and come out at thermostat. (bypass control box) Once you've determined which 2 they are, join them together & see if furnace starts, as it should. If it does, thermostat is faulty. If not, pull outside cover off & check voltages at furnace. I'm guessing by furnace model that your unit is approx 30 ft , but if it's a park model, you may have 24 volt system on furnace or 12 volt. Another way of confirming is to go to back of furnace where air intake grille is inside your unit, and locate 2 blue wires going to furnace & remove whatever wires are attached to them & connect them together. Furnace should start up.

Posted on Jul 08, 2009

Testimonial: "thanks for the link. info solved my problem."

SOURCE: LAST NIGHT WORKING FINE ~ THIS MORNING NOT BLOWING COLD AIR

check one of the following stop the cooling
a- condenser need cleaning
b- condenser fan not operating
1 -check correct voltage comes to the fan motor if ok
2- check capacitor if ok
3-check motor winding
c-low suction pressure
need check for leak before charging.

Posted on Sep 13, 2009

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Gas does not ignite on furnace. Fan stays on even when shut off at thermostat. When trying to start, I hear a click and get a gas odor that stops quickly. Furnace had major overhaul 10 years ago.


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Hi, You are right, fan is on a time delay in the heating cycle, and after burners fire that is when this delay comes into play. You have a preset factory temperature that determines the cycle on time for the fan, and the off time after the burners shut down also. This will not be in the thermostat, but in the fan/limit control the is mounted on the face of the furnace, with a probe inserted into the fire box.Depending on how old or new this unit is, will depend on the type control you have.It may be just a high limit switch, or the 1st I mentioned.If so, It rotates in the burner as the temperature rises, to turn the fan on and off.Disconnect power, remove cover, and 2 screws.Slowly remove the control and gently clean the probe. Turn the dial if this one has it and you will be able to hear it click. This click is contacts closing to start fan operation.Reinsert and try again. If problem continues, you will have to replace it.They do tend to stick closed/on, in the heat cycle from time to time and a cleaning sometimes will solve this problem. Not knowing how old this furnace is and type, make it difficult to give you a correct diagnosis, so check this fan control as I have explained, and if your system is of a different type, please let me no so I can correct this problem. Sincerely,
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1 Answer

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1 Answer

Sometimes the furnace doesn't come on when it should


OK so its an all electric furnace no gas? I cant think of anything clicking on an electric furnace except the sequencers or the safety switches.

If this is whats your hearing then the fan should definitely be running.

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