Question about Coleman Propane Forced Air Heater w/Electronic Ignition (50,000-80,000 BTU)

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The heater ignites the gas and it comes on, but turns off as soon as the blower comes on. It ignites and shuts off after about 20 seconds repeatedly until the unit shuts off.

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  • Richard Bedwell May 11, 2010

    flame sensor is bad and nead's to be replaced.

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Look for signs of a cracked heat exchanger. Flame will turn real orange or yellow when the fan turns on.

Posted on Nov 18, 2009

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Igniter goes on blower runs for 30 seconds main heater flame ignites and burns for approx 30 seconds then it shuts down for approx 10 seconds and repeats the same sequence 3 times, then shuts down...


there should be a flame detector sensor. it is in the flame. this will need to be cleaned with a wire brush or scrapped with something to get the carbon build up off of it.
you will see something that in in the flame area that is kind of charred and black with a wire coming out of it.
this is designed to tell the unit that there is a flame present and if that flame is not there after serveral attempts it will shut it down. because it there was no flame there you would get gas fumes pumped into you house.
you could change it out or usually you can just clean it and it will work fine.

hope this helps
rick

Jul 15, 2011 | Kitchen Ranges

1 Answer

My inducer comes on for 3seconds then shuts back off could there be something wrong with the pressure switch?


It begins its power-on cycle normally. First the updraft blower turns on for a bit, then the HSI glows bright orange, then the gas turns on and the flames ignite fully and the big blower turns on.
About 3 seconds after the gas ignites, it shuts off. That is the gas shuts off, the blower continues for about a minute then it shuts off. This cycle will repeat a few times, then usually after the second or third time everything stays on and works normally

Oct 30, 2010 | Kitchen Appliances - Others

2 Answers

Have a Goodman GMT070-3B which the vent motor seems to be sticking. I took apart and cleaned the brushes and reassembled. The furnace will come on only after what seems like the vent motor comes up to...


The whole assembly must be replaced.

The sequence of operation is -

Combustion fan purges the heat exchanger. A pressure switch verifies combustion air fan is running. Usually a 30-45 second purge before the hot surface ignitor glows, or the spark ignition starts.

Gas valve opens after 10-15 seconds and main burners light. Control board monitors for flame and shuts gas valve after 2-3 seconds if main burner does not light.

If burner does not light, some boards repeat this for 3 tries, then locks out and is reset by cycling power.

Air blower comes on after another 30-45 seconds after main burner ignition.

Times may vary based on the specific controller board. A flow chart and timing sequence should be located somewhere on the unit, usually in the fan compartment.

Dec 16, 2009 | Goodman GMS90703BXA Heater

1 Answer

Hayward Spa Heater H100ID blower will not stay on.


I had a similar problem and it turned out to be the solder connections on the control module. The connector that is soldered to this board (comes from the gas valve) needed to be re-soldered.

May 30, 2009 | Hayward H Series Induced Draft Abg 100,000...

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When Spa heater is turned on,Fan comes on but burner never lights


this is typical of a dirty flame sensor.your model does not have a thermo couple.remove sesor and clean with steel wool or fine emory cloth

May 11, 2009 | Sta Rite Sr200na - Max E Therm - Pool &...

1 Answer

I have a problem with my heating system. It is about 10 years old and has had the ignitor, combustion blower motor, and programable thermostat replace in it's lifetime. The system worked great last year....


sounds like its not proofing flame. it has a sensor usually like a needle sticks out into the flame that tells the gas valve the flame lit and is burning so its ok to keep sending gas, if its fails to proof flame then burner shuts down, then it tries to relight 3 times then locks out on fail safe. the blower will sometimes run continually once that occurs to highlight a failed condition. every time you reset it will try again 3 times then shut down. lp gas is very dangerous, even i do not work on it as the gas acts like gasoline and lays around. not like natural gas that disperses well. if you see the flame sensor try gently cleaning it with a little emory cloth. also a loose ground can cause this. check tio be sure any green wires are snug , they actually flow volts to ground through the flame on some to proof, thats why no ground no flame. if that fails then the board is most likely problem. change wire for wire , or get generic replacemant and follow directions exactly. good luck.some ignitors act as a flamre proofer as soon as they are done igniting! rarely do they fail to perform both funtions.

Nov 20, 2008 | Heating & Cooling

2 Answers

Mobile home miller propane gas heater


Sound like the blower motor is burning out. after it has run for a while, shut off the power to your furnace, then fell the motor. if the motor is really hot(be careful) then its starting to burn out. This is a very common symptom of this.

Nov 25, 2007 | Heating & Cooling

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