Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

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Coleman evcon furnace model dgat090bdd

Furnace runs thru a heat cycle then shuts down after cool down cycle, then restarts another cool down cycle and keeps doing this all the while flashing a green light 6 times for an error code of check power polarity

Posted by Anonymous on

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5 Related Answers

Anonymous

  • 34 Answers

SOURCE: furnace will not shut off

something is wrong with the thermostat.  replace it first, that would be the cheapest alternative

Posted on Nov 24, 2008

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Paul Carew

  • 3538 Answers

SOURCE: blower won't shut off on heat or cool cycles

Hi it souds like the afc is not working check the setings on it or clean the back of it /or replace

Posted on Feb 17, 2010

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Therinnaiguy

Chandler Ede

  • 1420 Answers

SOURCE: Furnace cuts off before reaching set temp.

You can make sure it is not the thermostat by crossing or jumping the R and W terminals (or associated wires) together. This will keep the furnace calling for heat. As it is approaching set temperature, get in front of the furnace and inspect the air filter to make sure it is clean, watch the control module for any error codes that may be turning off the system prematurely.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Posted on Mar 07, 2010

Anonymous

  • 14 Answers

SOURCE: I have a 2006 model

try checking the gas pressure might be to high or low thats what i would check first

Posted on Dec 11, 2010

heatman101

D. Floyd Kolb

  • 43501 Answers

SOURCE: wirlpool gas hot air furnace model WFAT 100B14-1A

Hi,
Does the flame and the blower cycle or just the blower...
if the flame is cycling then the flame sensor is dirty/bad.....or there is a bad ground....
if it is just the blower cycling then the gas pressure could be too low and the fire is not hot enough...the furnace also may do that if you are running fairly cool temps. in the house...

To check the gas pressure you need to have a tech. do it that has the proper equipment to read in. water column....to set the gas pressure for you...

heatman101

Posted on Dec 30, 2010

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1 Answer

Furnace reaches temperature set then shuts down and restarts 8 times before final shutdown.


When you say the the furnace re-starts 8 times before shut down, what is cycling 8 times? just the indoor blower or is the main burner re-firing 8 times? If it's only the fan it sounds like the fan control.

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Why does my Coleman furnace model# DGAA090BDTA stop and start to get up to temp?


That's how it should work .Your furnace will cycle on and off to reach set point .
You don't have to troubleshoot the thermostat. The reason why your furnace cycle is once the heat exchanger get to a certain temperature the board will shut it off, fan would still work to cool heat exchanger down then once cool down furnace will fire up again .

Feb 11, 2018 | Coleman Heating & Cooling

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When thermostat turned up furnace ignites, heats and fan starts when plenum is up to temp. When thermostat is turned down flame goes off but fan continues to run.


If your furnace is relatively new, as in 10 years old or less, there should be a field adjustable 'cool down' cycle. On the circuit board there should be a dip switch or series of dip switches with 30, 60,90,120 indications. These numbers represent the length of time the relay on the circuit board allows the fan to run AFTER the thermostat satisfies. You may be able to adjust the time frame down one position from where its positioned now.


The second possibility, if the blower never shuts off at all is that the relay itself could be stuck in the closed position and keeping the fan on.

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WHAT SHOULD THE heat anticipator BE SET AT ON A MODEL COAT066BDA COLEMAN EVCON FURNACE


The typical starting point for heat anticipation is .4 amp. If you do not have a clamp-on ammeter, adjust it to .45 and observe operation for a few days. If not quite right and still short cycling slip it to .5. Then keep doing this until you are satisfied cycle time is correct.

If you have an amprobe or can borrow one, remove the stat and take a single loooooong thermostat wire. Attach it to the R or Rh and wrap it around the clamp on ammeter ten times then attach the other end to the W terminal. The furnace will initiate the heat cycle at that point. Observe the amp reading on the amprobe when full heat is on, DIVIDE that reading by ten (for the wraps of wire) and adjust the heat anticipator to THAT setting.

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Trane XR80 Furnace won't stay running


It sounds like your flue work in your main problem get this fixed first then see how it runs , pipes should run all the way out of the chimney .

Jan 23, 2013 | Heating & Cooling

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My furnace is a Coleman Evcon DGAT090BDD and it won't turn on at all. The green light is solid green, I can't find the pilot light, and its freezing in here. Please help me!!


Your furnace has an electronic ignitor so there is no pilot to lite...... I would shut power off to the furnace and then restart it....this will reset the control board and take it out of lock out..... If the hot surface doesn't glow after you restart it then it is probable burned out and will have to be replaced.....It is inside the furnace right behind the Gas Valve. Will have two wires running to it from the control board....If you can't get it goingby shuting off the power and reseting it then you many want to call your Service Company to have them check it out.....

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1 Answer

My furnace keeps blowing cold air after it is supposed to shut off. Why?


If you mean the heat or AC cycle, it has to do this to cool down the furnace/coils. It is a safety cycle and do not try to defeat this purpose.

Jan 03, 2011 | Heating & Cooling

1 Answer

I have a Coleman Evcon gas (propane) furnace. When the t-stat is switched to heat the furnace heats up but the blower will never turn on. The unit then shuts down and tries to cycle again. I have replaced...


If the unit fires but the main blower fan doesn't come on the the unit is shutting off on a temp high limit switch and it sounds like the problem is the main blower fan motor or control

Jan 18, 2010 | Coleman Heating & Cooling

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