Dometic 3109228.001 Duo Therm Comfort Control 5 Button Logo
Anonymous Posted on Jan 18, 2013

Furnace refuses to cycle off even when room is 20 degrees warmer than setting

Have tried replacing comfort control and furnace control board

  • 12 more comments 
  • Anonymous Jan 27, 2013

    I could, but the RV repair guy already checked that and replaced to control board.

  • Mike Butler
    Mike Butler Jan 28, 2013

    Please explain better what he did if you can. Did he replace circuit board on furnace or control box in the ceiling at AC?

  • Anonymous Jan 28, 2013

    He replaced the circuit board on the furnace. Prior to that he replaced the comfort control. Neither fixed the problem.

  • Mike Butler
    Mike Butler Jan 28, 2013

    If you have the remote style control, have you tried setting remote closer to heat source? Have you tried putting another thermometer close to wall thermostat to see if temperature is same on both? Are you familiar with the wiring at your furnace connection from thermostat?

  • Anonymous Jan 28, 2013

    Do not have remote style. With thermostat set at 59 another thermometer shows 78 and furnace is running. Not familiar with wiring, expected RV repair was.

  • Mike Butler
    Mike Butler Jan 28, 2013

    We are familiar with wiring but the reason I asked you if you were familiar with the wiring is so I could hopefully guide you through troubleshooting, seeing how I can't come there and do it. hee hee. FInding out your level of experience in the area, helps me determine where to start guiding you.

  • Anonymous Feb 02, 2013

    After playing with the settings have found that if I set the temperature at 60 the furnace will cycle on when the coach is 72 and cycle off when it reaches 78, but only at night. During the day the furnace will not run unless a higher setting is used.

  • Mike Butler
    Mike Butler Feb 02, 2013

    Is thermostat mounted where sun can shine on it during the day?

  • Anonymous Feb 02, 2013

    No.

  • Mike Butler
    Mike Butler Feb 02, 2013

    Have you tried doing a system reset yet ? explains it in your owners manual.

  • Mike Butler
    Mike Butler Feb 02, 2013

    Also, do you have the 5 button control or 4?

  • Mike Butler
    Mike Butler Feb 02, 2013

    What model RV is this in and where is the control center mounted, inside wall, outside wall, etc, how high above floor? Was it a factory install?

  • Anonymous Feb 03, 2013

    5 button factory install on inside wall 2004 Monaco Knight.

  • Anonymous Feb 03, 2013

    Have done system reset.

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Mike Butler

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  • Dometic Master 6,674 Answers
  • Posted on Jan 27, 2013
Mike Butler
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Do you know how to access your furnace wiring ? What make/model furnace?

  • Anonymous Jan 27, 2013

    I could, but the RV repair guy already checked that and replaced the control board.

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tip

Keeping your whole home cool with central air.

Sometimes it is difficult to keep your home cool in the hot summer months. Also, some areas of your home may still be hot where other areas are too cool. Try this method to keep your home cool evenly throughout. Before you get started make sure your furnace filter is new. This will allow for maximum air flow.

If your living space is a single floor plan:

  1. Turn the air conditioning on
  2. Switch the furnace fan from auto to on.
  3. Measure the temperature in each room.
  4. Close the vents by about half in the cooler rooms
  5. This will force more cool air into the warmer rooms.
  6. Keep adjusting the vents until all the rooms have the same temp.

If your living space is on more than one level:

  1. Turn on the air conditioning.
  2. Switch the furnace fan from auto to on.
  3. On the lowest level of the house close half of the vents that are the closest to the stairs.
  4. This will force more cool air to the top floor where it is usually hotter.
  5. Cool air will sink from the upper floors which will keep the area near the stairs cool.
  6. Measure the temperature in all the rooms.
  7. Keep adjusting the vents until you have a nice even temperature throughout the house.
I found that leaving the furnace fan on all the time will keep your home evenly cool and comfortable. You may have to replace your furnace filter once a month due to the increased air flow. It will be well worth it in a cooler, more comfortable, and more energy efficient home.

Take Care,

Eric
on Aug 09, 2010 • Heating & Cooling
0helpful
1answer

Fasdfas

Does the furnace stays off?.
Furnace are ment to cycle on and off because of limits .If you set to 70 furnace would cycle several times before reaching that temperature.
Just make sure your filters are clean and you got proper return air flow because lack of air flow will cause furnace to shut off sooner than normal
1helpful
1answer

I just installed a honeywell 5-2 progammable thermostate.. Everything is hooked up fine and I have my days, hours wake, sleep, leave...etc all set, but when it goes on.. for example, I have it set for...

You didn't include a model number, so it's hard to know for sure - but I'll take a stab at this one. Many of these t-stats have a programmable offset to reduce "hunting". This can be as little as 1 degree or more than 2 degrees.

This means if you set the offset to 1 degree and the room temperature to about 65 degrees, the furnace will heat the room until the t-stat registers a rising temperature of 66 degrees. The furnace shuts off and will not turn on again until the t-stat registers a falling temperature of 64 degrees. The average is 65 degrees, and prevents the furnace from starting and stopping numerous times instead of just once with the 1 degree offset.

You can further reduce the number of furnace start and stops by increasing the offset to 2 degrees. This would work like this when the t-stat is set to 65 degrees and the room is cool:

Room Temp Furnace
63 On
64 On
65 On
66 On
67 On
68 Off

The room is now warm and heat or furnace is off. The room begins to cool like below:

67 Off
66 Off
65 Off
64 Off
63 Off
62 On

With a 1 degree offset, the room temperature varies +/-1 degree (about 2 degrees total). With a 2 degree offset, the temperature about varies +/ -2 degrees (about 4 degrees total).

Also, when the thermostat shut the heat off, the heat that was made is delivered to the space instead of wasted by sending outdoors - so the room will get a little warmer even though no fuel is being burned. The same holds true at the other end. When the t-stat turn heat on, fuel is burned, but there's little heat until the source has reached the optimum temperature and then the heat is delivered to the space.

I hope this helps & good luck! Pleas rate my reply - thanks!
1helpful
1answer

Carrier Comfort Zone II Smart Control in one zone frequently cycles unit (every 20-30 minutes) even when temperature in the room does not change significantly and the indicated thermostat temperature does...

sounds like your zone control tstat needs calabrated or maybe replaced,in owners manual there should be a section on calibration if not you may have to replace it
0helpful
1answer

I have a comfort zone furnace. If it's 50 degrees in the house, and i set my thermostat to 70 or so,it takes at least 24 hours to reach 70 degrees. The furnace starts up and runs normally for about five...

When the thermostat calls for heat it should run until the room reaches the temperature setting then shut off. Is the blower motor running and can you feel air coming out of the vents? It sounds like the blower is either not running or putting out enough air to keep the furnace heating. The blower moves the heat from the heat exchanger to the room, if it can't remove enough heat from the heat exchanger there is a limit switch that will shut the burner off if it gets to hot and that's what it sounds like is happening.
0helpful
1answer

Thermostat location on York Diamond 90 gas furnace

Augold, sometimes its best to set the thermostat where you "feel comfortable" . I.E. set it and leave it til you feel the need to be cooler or warmer.

A thermometer on a thermostat will not always be accurate and setting it will only get it within 2 to 5 degrees which is enough to "feel".

Now from the stand point of is it working properly????

Assume you feel comfortable and the heat stays on to keep you comfortable is their anything wrong with this? I assume this is the goal. Even if it says 90 (and you know its not 90) and your comfortable you could leave it alone and be OK. If this kind of thing is whats bothering you a new thermostat may not be much better, unless your ready to invest in one and accept it however it should be closer to the place youd set it. Id recommend an electronic type they are more accurate and level doesn't matter so much to these types.

If you want to set the temperature and are determined to go by a thermometer to "feel Comfortable" I recommend you buy an electronic thermometer and set it close by the thermostat. Make sure you have no lamps or other heat sources close to the thermostat area.
Remember the far end of a room or a chair by a window Especially with little or no curtains and on the prevailing out door wind will always feel colder and be colder than the area by the thermostat even if both are in the same room. If your too cold try running the thermostat up a few degrees. If too warm set it lower. The equipment doesn't care how cold or warm it is.You will not increase your utility bills to the national debt by being comfortable

If this helps please grade me accordingly and Good Luck.
0helpful
1answer

Heat temperature issues with Goodman GMP 100-4 furnace

69,000 btuh is adequate for a 12-1400 square foot house.
Otherwise, your thermostat simply tells the furnace to cycle on/off.
If it calls for heat and does not come on, the problem is with switches and relays within the furnace.
Your setting the temp higher only causes the other parts to keep trying until they finally light and heat.
This is based on your information saying it will cycle on and blow cool air--not hot air.
You will have several temperature variations from floor to ceiling.
You probably have ceiling vents as well.
You need a technician to verify the rollout switches, fan relay, inducer fan etc. if the furnace is not firing everytime you call for heat.
0helpful
1answer

Temp shows 2 degrees warmer than what is was set to

sometimes the furnace does a better job than anticipated, i wouldn't worry about it, especially if the furnace shuts off.
the setpoint is the temperature you want it to be
cycle lenghts are determined by how much recovery you are requesting. for instance, in the morning when you wake up, you want the temperature to be at its setpoint. what the thermostat will do is make the furnace run a limited lengths during the recovery process.
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