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I have a Coleman gas furnace that will not ignite. I replaced the thermostat and the thermocouple and it ran fine for 1 cycle.. then shut off and will not kick back on. All the limit switches have been tested and is fine.. all the wiring was tested and is fine.. the circuit breaker isn't tripped.. so I don't know what's going on. The pilot light is lit and stays lit but doesn't ignite. PLEASE HELP!!!!

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  • 187 Answers

I say jumper the thermostat red and white wires. Sounds like the thermostat failed.

Posted on Nov 23, 2014

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Heater blower motor cycles on and off (frequently). I have a class 2 LR95329 Honeywell Thermostat

I had the same problem with a Coleman. The problem is the blower relay. You can find this at http://mobilehomerepair.com

Posted on Oct 21, 2008

  • 306 Answers

SOURCE: Coleman Propane Furnace Good pilot light but feed/ignite main burner

If you have a volt ohm meter take the two leads off the gas valve and ohm out the connection should have resistance for the coil. You said you have 12 volts from the thermostat white and red in the heating mode you should have minimum 26 volts. If you want to check the transformer should have 28 volts. Almost sounding like the transformer is getting weak. You can get parts for a 20 year old unit at any HVAC parts house. Try Washer Specialties here in Wichita Kansas they are on the web. Lowes even carries Transformers. Has to be rated 120 volt primary side secondary side 24 volts and 40 VAC.

Posted on Nov 24, 2008

muttandjeff
  • 359 Answers

SOURCE: Rollout Limit Switch Keeps Tripping

have someone check the gas presure most likely too high no more than 11

Posted on Dec 17, 2008

  • 53 Answers

SOURCE: My coleman floor furnace will not stay on

Have the thermocouple replaced, ensure the pilot flame is blue - not yellow, yellow indicates blockage in pilot

Posted on Oct 08, 2009

heatman101
  • 43501 Answers

SOURCE: Coleman Gravity Floor Furnace need millivolt gas valve & pilot ki

Go to www.grainger.com and look for a "power pile generator" this is a millivolt thermocouple that may be just what you need to make your heater work again

Posted on Nov 12, 2009

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The clicking noise is a relay or switch of some sort. You are right about that. I have 2 questions. 1) does the thermostat have a mercury bulb in it? 2) when the fan shuts off and on, does the burner stay on?

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