Question about Dometic Rooftop RV Air Conditioner

1 Answer

Analog thermo.stat control kit

With the ac power supply & the roof top air conditioning unit disconnected, the 3 amp fuse blows any time i attempt to turn the thermostat. Is the relay board the likely problem???????? LC in ohio

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Dometic Master
  • 6,674 Answers

Have you tried removing the RH wire connected to the thermostat and try it ? This might rule out furnace as short in system. If it does the same, put RH- (heat) back on and try removing RC-(cool) , if it doesn't pop the fuse, you may have isolated the problem.?

Posted on Aug 23, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have a duo therm model 57915531. i have checked the breakers all the fuses and the thermostat. i have found a 3 amp fuse in the control panel of the roof unit. this fuse was blown. i replaced it and it...


That unit has a thermostat I believe and 12 or 24 volts to power it. The 3 amps tells me it may be either line or low voltage, see manual. the fuse blows due to a short in the control circuit, a transformer if low voltage.

Sep 10, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

3amp fuse is blowing.


Disconnect the yellow wire from the thermostat and tape off the end. Turn the power back on. If the fuse blows, it is not in your wire nor the compressor contactor. If the fuse does not blow, turn off the power, reconnect the wire, and replace the fuse. Then, disconnect the wire from the compressor contactor and tape it off. Turn the power back on. If the fuse blows, it will eliminate the compressor contactor coil and will likely be a "short" in the wire itself. The yellow wire goes from your T-stat to your air handler and from your air handler, it goes to the oudoor unit's compressor contactor.

Apr 07, 2010 | Weather King 10PJA2501AH Air Conditioner

1 Answer

Dometic 57915.531 Air Conditioner Blows 3 amp fuse in control box


Steve,

The three amp fuse is installed in the board to protect from shorts or overloads created by disconnecting or reconnecting components when DC power is still connected to the system. If the fuse is blowing, then you more than likely have a short in the 12VDC system between the control unit and the thermostat.

1. Pull the cover off of thermostat and remove the +12 (or +7.5 depending on the model) wire. Access the other end of the wire in the AC compartment. Using an ohmmeter, touch the end of the wire at the AC with one lead and touch the control box with the other (or any ground source). If you get a reading other than OL or Infinity, then that wire is shorted out in the wall somewhere. If not, repeat the steps for the rest of wires except the ground of course. If all of these wires appear to be fine, you may need to take it in for some more extensive troubleshooting.

Hope this helps,

Jeff

Please rate me!!

Jul 04, 2009 | Dometic 57915531 Air Conditioner

1 Answer

Rf top ac on rv keeps blownig the 3 amp fuse


The 3 amp is 12 Volt protection for the control board. If that fuse is blowing instantly, then you have a short in the 12 Volt system somewhere. More than likely it is somewhere between the Thermostat and the control unit. Check to see if you have 12V at the thermostat. If so, then disconnect the red wire from the thermostat and the red wire at the control unit. At the control unit side, use an Ohmmeter to see if you have continuity with ground. If so, that wire is the culprit. If not, reconnect the red wire and continue to the next wire. Do this until you find the wire that is shorted to ground. Of course, the ground wire will not be checked.

Hope this helps,

Jeff

Jun 29, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Roof top air won't come on


If you are running the AC on an extension cord it can cause such voltage drop that a fuse or breaker can blow, in extreme conditions it can damage electrical connections. Always use extension cords that are as short as possible and replace the cord ends (especially the female end) whenever they lose clamping force. A heavy duty cord end takes much more effort to plug in the male end and to plug things into the female end. Over the counter extension cords for your purpose should be no less than 12/3 with heavy duty (20 amp) ends and no more than 50' long, if you must go farther you should use a 10/3 cord.

May 26, 2009 | Dometic Rooftop RV Air Conditioner

2 Answers

Blowing 3amp fuses


You have a low voltage short. A lot of low voltage shorts come from the wires that go out to the outdoor unit. Go outside and inspect those wires and that they are in good condition. Also check for any splices in those wires that they haven't degraded in any way. This is the only thing that will blow the fuse. That's why it's only 3 amps and based on the size of your fuse, it's a gas fired unit right? Have a great day!

Apr 10, 2009 | Ruud UBHC Air Conditioner

1 Answer

ATWOOD MOBILE FURNACE RUNS WHEN IT WANTS/


Check your furnace for power. will be 4 wires. power ground and 2 thermostat wires. Check for power at the time delay relay, if you have power there check for power going in the fan motor, if power in motor wire, motor is bad. If no power in motor wire and power going to circuit board take the 2 thermostat wire apart and wrap the 2 together comimg from the thermostat. Fan will stat in about 30 seconds. If it does you need a control kit in the ac. But sounds to me like you have a furnace problem.

Jan 14, 2009 | Dometic Heating & Cooling

2 Answers

Dometic air & analog thermostat control kit


Had one doing similar recently, and after a thunder & lightning storm. Nothing worked, but kept blowing 2 amp fuse in thermostat, when anything tried, heat or cool. Pulled plastic control box down from inside upper unit (AC) made sure breaker was off, took of plastic cover and smelled inside, and could smell burnt plastic smell. Replaced, control box, that got fan only working. Tried another thermostat , everything worked as it should. Turns out the lightning, or power surge, or whatever, shorted out the thermostat, and control box at same time.

Aug 03, 2008 | Dometic Rooftop RV Air Conditioner

Not finding what you are looking for?
Dometic Rooftop RV Air Conditioner Logo

403 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dometic Heating & Cooling Experts

Bill Long

Level 3 Expert

587 Answers

mike cooper

Level 3 Expert

864 Answers

Tim Whalen

Level 3 Expert

3069 Answers

Are you a Dometic Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...