Question about Dometic Rooftop RV Air Conditioner

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REPLACED the control box and t'stat --unit will still not run

What can i trouble shoot from here?

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Make and model please?

Posted on Jan 27, 2013

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1 Answer

Blower fan continually runs


It may be but the fan control may be set to turn off at to high a temp, or theres a short between ;r; and g at the stat or furnace or sequencer, IF it runs through it. A limit or rollout switch may have failed but this will keep the unit from firering. Check for a manual blower switch that may be on. At stat it should be at auto and alsso at the fan control. A stuck relay is always possible,

Mar 08, 2015 | Coleman Home Electric Furnace Eb15b/Eb15d

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Trouble shoot dayton heater


Either your thermostat control is bad or the contact relay. If you hear the contact relay click when you turn t-stat up relay is probably good, if not its probably t-stat controller.
Hope this helps

Feb 11, 2015 | Dayton Heating & Cooling

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Hi - I've replaced the thermostat. Furnace runs then shuts off before reaching temperature. Winter in Wisconsin is cold! We now think it's the 1018 series hot surafce ignition control box , but...


When you replaced the stat, did you set it for gas or electric heat?? makes a differance!!
If your heat is starting, the ignition box is doing its job.

Jun 25, 2011 | Heating & Cooling

1 Answer

Hi there We had a powercut overnight and now the ST7100 will not run. I can hit set and set the times etc but when I hit Run the screen goes blank. Any ideas greatly appreciated. thanks


Hi, when you lost power, it may have taken out a fuse to the indoor unit if this is the kind of system you have, I don't know. As far as the stat going blank when you hit run, it may be the 24 volt circuit board fuse, I would need more information on the system you have. See if your stat has batterys also.If nothing is running at all, check all breakers, fuses and so on. If you do have a split system, the indoor unit will have a circuit board where the stat wires are terminated. The fuse looks like a auto fuse, 3 to 5 amp. This may be blown. If so, replace and your back in business. Like I said, if I new what kind of unit you have, it would be very easy to trouble shoot. It may have taken out the transformer also. Just make sure all power is restored, no breakers tripped and fuses blown at the indoor unit. This should be very easy for you to take a good look at this unit. The display on the stat runs off batterys most of the time, but some are powered from the transformer. Try what I have said, as you will need to have 24 volts to the stat to fire up the unit, and if you do and the stat still goes blank, you have a faulty stat board. Keep me posted. Best of luck to you.
Shastalaker7
A/C, & Heating Contractor

May 12, 2011 | Heating & Cooling

1 Answer

Heat pump start cap went bad. replaced and when unit turns on compresser hums-won't start. push contacter in and it stats fine. it's a two speed. ?


The reason the compressor starts when you push the contactor in is that you have an "open" in your control voltage. I would suspect that the thermostat was bad - since that is 'usually' the only component you have in that circuit.

Since you indicate this problem 'surfaced' after you had the "start cap" replaced - I might be suspicious of the new start cap and how it's wired in - but "assuming" it is correct I would probably change the thermostat.

Note: as with any Air Conditioner - when you start 'changing parts' you run the risk of changing out a perfectly good part (thus wasting perfectly good money) - so - if possible I would see if I could find someone to electrically trouble-shoot the AC to determine 'exactly' what was causing the problem.

hope this helps

Jul 28, 2010 | Heating & Cooling

2 Answers

Blower continiously running...switched out fan control brd, still runs...rmoved all t stat wiring and still comes on


Hi, sounds as though your at the end of your rope!! Yes, this can be a ***** to figure out. So, you replaced the main control/blower board, and removed all stat wires at the stat. I don't know if this is a split gas heat and cooling unit or a heat-pump or the age of the unit? On the blower board, did you remove the stat wires on it first before you took it out and the fan kept running? Or did you switch it out by doing one wire at a time and then putting the stat wires on the new board. What I am trying to find out if you remove the green wire now at the board, have you tried this to see if the fan stops? I'm just trying to rule out any stat wires touching at either end or in the wall causing the fan to run, but I don't believe this to be the problem. Depending on the unit if it has a gas furnace or heat-pump, you need to go to the fan limit control. If it is a gas furnace, you have a fan control that has stuck contacts causing the fan to default and run. If it is gas and a older unit, it will be a Honeywell type with a chrome box on it. Behind the cover is a switch, fan control switch that brings the fan on and off. It rotates and they will get dirty and stick. It will need to be removed a cleaned with a old tooth brush works well. If you have a heat -pump, no gas indoor unit, look for your fan time delay relay. Look on your schematics and it will show you where its at on the unit. It is most likely the cause, burned or contacts welded together. It will say TDR on the schematic. It will send 24 volts to another relay where one leg (hot wire ) that your fan connects to all the time causing fan to run. If I were there on site, with a few checks with my meter would have you on your way, but I'm not. Also. there is a small round fan limit which depends again on the type, that is located on some up by the blower motor with a wire in and out and has a fan reset button on it. By resetting it, it opens the circuit shutting down the fan. Check these things out and keep me posted. If you will, please tell me more on the type of system it is you have. This will make it much easier to trouble-shoot. Please let me know and please be kind when rating me. I thank you for this. I hope I have been of some help to you. I will be here for more help to you.
Sincerely,
Shastalaker7
A/C & Heating Contractor

Jul 01, 2010 | Heating & Cooling

1 Answer

Heat pump trouble shooting fema trailor i have a az75h18dacm1 self contained air cooled heat pump that wont work. cant find any info on this unit. have replaced the stat,the fan comes on only if it want's...


Normally the Fan only comes on when it is called for by the compressor, here is their web page that you can go to and pick your model and get their trouble shooting guide to repair your system, they also have a 800 phone number to help you. I am familiar with the unit but you need to look in there trouble shooting guide to properly troubleshoot your problem, you can call there 800 number and ask for help as well. Hope this helps.
http://www.rheem.com/Products/Heating_and_Cooling/

Mar 01, 2010 | Heating & Cooling

1 Answer

Can't get my dometic a/c or the furnace to work fuses are good how do you trouble shoot a remote . It doesn't have an adjustable therastat. it's in the remote.


Hi, I am sure you have replaced the batteries 1st thing, but still nothing? Can or are you able to get to the unit fairly easy and check to see if you have power to this system? That's what you need to do first, or check down below at the fuse box to see if the is actual power going to the load side or unit side.I would think even though you have a remote to control this unit, it would also have a stat for manual control? If power is good but the remote is not working, you would have a fault from the remote to which ever part of the system the remote Links with. You would have to have this remote checked out unless you can look the unit over for voltage problems like I mentioned to you. Let me no what you find out. Best of luck,
Shastalaker7

Nov 22, 2009 | Dometic Rooftop RV Air Conditioner

2 Answers

T8000c honeywell thermostat is blank


This unit doesn't require a battery. It runs off the 24v from the unit. Check that your transformer is still working. Check the control board for 24v pwr. and main pwr. Check your breaker to the unit. It could be as simple as a bad stat too. You can check by using a jumper wire and jumping across from r term. to y term.

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No turn or emergency signals.


hi there

your flasher unit may have stopped working

this is a unit that makes the light blink on and off
if it stops working then you will have no lights
the best thing to do is have it replaced
the unit is normal behind the lower dash on the left hand side of stearing wheel
have a look for it. then take the unit to a car shop and they should be able to help you

hopes this helps
ricko

Dec 29, 2008 | 1997 Dodge Intrepid

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