Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater
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
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
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
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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Jun 17, 2017 | Coleman Heating & Cooling
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).
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