Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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I have no flame to the heater, but the blower works when I turn the thermostat on.

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  • 149 Answers

Typical ign. sequence call from thermostat, venter starts proves airflow, hot surface ign, or whatever type you have flame rod senses spark or hsi once proven if all safteys are closed you should get gas valve opening gas on check these one or more isn't happening.

Posted on Feb 01, 2010

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Posted on Jan 02, 2017

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SOURCE: LP wall heater blower motor doesn't turn on

Does the heater burner come on? If the burner comes on then the problem is not in the t-stat. What is the model# & serial # and brand of heater. If you turn off power to unit and turn t-stat off, then turn unit back on then go to t-stat turn it up to temp. setting you want. Then you should be able to see heater gas valve opened and fired. If it has fired up then it will run for a couple of minutes before the fan will run. If you have anymore ? about the heater operation let me know.

Posted on Jan 08, 2009

  • 58 Answers

SOURCE: heater turns itself off. This happens after it has

I WOULD BY PASS THERMO STAT , TO TAKE THAT OUT OF THE LOOP, DONT KNOW THE TYPE BUT ON A TWO WIRE SYSTEM IF YOU CROSS THEM IT MAKES A DEMAND FOR HEAT AND THE HEATER SHOULD COME ON, IF SO THERMOSTAT IS BAD,MY FIRST GUESS, SECOND IS SOME TYPE OF SENSOR, SNAP DISC SENSORS LOOK LIKE S NICKEL WITH TWO WIRES GOING TO IT, THE USALLY HAVE A LITTLE RESET BUTTON ON THEM, I WOULD CHECK THESE, DONT CONFUSE PROBLEMS, TRY TO ISOLATE ONE AND TRAC IT DOWN, GOOD LUCK RIGHT BACK

Posted on Jan 25, 2010

  • 413 Answers

SOURCE: My mister heater big max

It sounds like your low voltage circuit is open. Here are things to look for that you should be able to find on your own
1) check for a tripped limit switch

Posted on Apr 16, 2011

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Coleman evcon presidential heater won't kick blower on.


Sounds like the automatic fan control is not working it cuts in on temp rise . It may be dirty on the back of it as you said you had a smell of dust burn

Jun 17, 2017 | Coleman Heating & Cooling

1 Answer

Fan turns on, pilot on left side turns on red light at bottom stays solid during entire time then pilot goes out and blower stops no heat please help


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 remaing 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).

Oct 05, 2010 | Goodman GMS90703BXA Heater

1 Answer

Heater turns itself off. This happens after it has tried to restart the flame when the room has cooled.If I reset the thermostat at a high temp it will restart and heat the room but too much. if I set the...


I WOULD BY PASS THERMO STAT , TO TAKE THAT OUT OF THE LOOP, DONT KNOW THE TYPE BUT ON A TWO WIRE SYSTEM IF YOU CROSS THEM IT MAKES A DEMAND FOR HEAT AND THE HEATER SHOULD COME ON, IF SO THERMOSTAT IS BAD,MY FIRST GUESS, SECOND IS SOME TYPE OF SENSOR, SNAP DISC SENSORS LOOK LIKE S NICKEL WITH TWO WIRES GOING TO IT, THE USALLY HAVE A LITTLE RESET BUTTON ON THEM, I WOULD CHECK THESE, DONT CONFUSE PROBLEMS, TRY TO ISOLATE ONE AND TRAC IT DOWN, GOOD LUCK RIGHT BACK

Jan 25, 2010 | Heating & Cooling

1 Answer

Hi~ i have a coleman-evcon heater in a mobile. The heater comes on when the thermosat is turned up to, say 65 from 55, then before the air blown out is even really warm, it shuts off. it runs on propane,...


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).

Jan 13, 2010 | Coleman Propane Forced Air Heater...

1 Answer

Heater quit working, i notice this after the bolwer motor didnt shut dowm


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).

Jan 10, 2010 | Goodman GMS90703BXA Heater

1 Answer

Intalled an overhead 130K BTU Mr. Heater last


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).

Dec 01, 2009 | Mr. Heater Heating & Cooling

2 Answers

When I turn my furnace on, the purge blower starts as normal, then after 15 seconds the ignitor starts to glow but when the gas valve should turn on it only turns on for a split second and then you can...


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).

Nov 19, 2009 | Goodman GMS90703BXA Heater

1 Answer

Flame wont stay lit


Sounds like a flame sensor problem. The board is not getting the proper signal from the flame sensor so it thinks the burner did not light and shuts the gas supply off. It keeps the blower operating to ensure that no gas is accumulated in the burner area. I suggest you contact a local mechanical contractor to service your heater.

Jun 23, 2009 | Pentair Minimax NT Heater

1 Answer

Coleman presidential II furnace blower on and off


Sounds like the flame sensor. But it could be the thermostat. Is the furnace standing pilot or electronic spark or hot surface ignition. I would start by checking thermostat. Turn power off to furnace take thermostat off wall and take wires marked r & w and connect them together. Turn power back on if furnace works then change out thermostat.Most eclectronic ignition Furnaces have a flam sensor, You could take flame sensor out and clean it up with steel wool or wire brush. If you need anymore help just reply back .

Jan 17, 2009 | Coleman Propane Forced Air Heater...

1 Answer

The furnace "runs"... you can hear it click and want to turn on but the blower doesnt come on. The blower works if I set the thermostat to ventilate though.


Your flame detector circuit is bad. The heater never lights, so the blower never comes on. Another thing would be the temperature sensors mount on the duct close to the burners.

Jan 14, 2009 | Heating & Cooling

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