Question about Coleman Heating & Cooling

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Coleman model 296OC666 vent blower will not cycle off. Don't know what to check. Replaced the heating relay 2 yrs ago. Don't know if it controls the vent fan and being only 2 yrs old and all other systems work.

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  • chford867 Dec 13, 2009

    I have checked the heater and this unit doesn't have a circuit board. The only connection for this vent motor is one wire to the transformer and the other wire goes to the heating relay. I replaced the heating relay 2 yrs ago. Is this relay controling the vent motor? A wire on the same spade connector with the vent motor goes to to a connection on the ignition module. Is there a test for the heater relay to see if it is still good? The relay is only 2 yrs old. Thanks

  • chford867 Dec 13, 2009

    I will try what you have advised. The vent motor comes on but it will not shut off at the end of the heat cycle. Didn't know if the relay also told it to shut down. Have to manually shut the vent motor off.

    Thanks

    Charley

  • chford867 Dec 14, 2009

    This is not the main blower motor. That blower works as it should. It runs a short time after the burner shuts down, The problem is with the exhaust vent blower that comes on before ignition and shuts off when the burner and main blower shuts.down.It will not shut down after the heat cycle. It continues to run. This unit utilizes pvc pipe for the exhaust vent not double wall 4" metal pipe. Vent pipe is 2".

    I had an error in the model number. This is a 65000 BTU Natural Gas Model 2960C666. The fourth character is numeric not an alpha o.

  • chford867 Dec 14, 2009

    Thanks. I did have the model # wrong. It is a 65000 BTU Natural Gas Model 2960C666. The problem is not with the main blower. This unit has a vent blower that comes on before the pilot and main burner ignition. This clears the unit for burner ignition?? Every aspect of the heater works except when the burner and blower shuts down the vent blower continues to run. To shut it down I have to trip the blower door saftey switch. I mentioned that the heating relay was replaced 2 years ago. Didn't think it should have failed in that time frame. This unit is vented thru the vent blower into 2" pvc vent pipe.

  • chford867 Dec 14, 2009

    The model number I listed is wrong. It is a Coleman natural gas unit 65000btu model 2960C666. The main blower is not my problem. It is the vent motor. I will not shut off after a heat cycle. The vent duct for this unit is 2" pvc directly off the vent motor. Thanks

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4 Answers

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  • Coleman Master
  • 43,501 Answers

Hi,
Your problem is with the relay on the circuit board that controls the vent blower. This relay has welded the contacts making the blower run continuously.
The relay is not replaceable so you will have to order a new control.
The part will be the main control that all the t-stat wires hook too.....

I hope that this will help you to solve your problem!

Thanks for using Fixya!!

Heatman101

Posted on Dec 14, 2009

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  • Master
  • 614 Answers

If this model has a fan ignition board. The signal from the tstat brings the fan on before ignition. Kill power to unit. Retry again if fan comes on without a call from tstat you have a bad board. Replace.

Posted on Dec 13, 2009

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  • Master
  • 1,515 Answers

Hi, being that this is a newer unit, you will need to look at the fan control, or high limit switch.They will stick on at times and the indoor fan will continue to run. Being a Coleman furnace, in behind the circuit board, you should have a fan switch that has a manual reset on it. Try to locate this and push the button to reset, and fan will cycle down.You may have to do some searching to find it, and you can also look at the schematic to point you to it.Please keep me informed and I will work on helping you solve this. Let me know. Sincerely,
Shastalaker7

Posted on Dec 11, 2009

Testimonial: "I will replace the relay. I will keep you updated. Thanks"

  • Robert Horton
    Robert Horton Dec 13, 2009

    Hi, This is currently locked out to me. I was under the impression you were talking about the indoor motor, my mistake. The inducer motor/ combustion/ vent motor is energized through your ignition module. Yes the relay will come into play on a call for heat at the stat.On the relay will be a small schematic arrangement showing the relay in its normal state, before power is relayed to it.You can see the contacts and the position they will be in on a call for heating, N/O or N/C. You can check with a volt/ohm meter to see if the contacts are in the right position when called upon to see if the relay is energized. The 2 points on the bottom of relay that are soldered, will be the 24 volt coil, and you can check across those 2 points to see if the heat relay has power from the module.If it is getting 24 volts, doesn't mean it is good, you will have to check the other contacts to see what position they should be in.That relay supplies 24 volts to close the other leg of the vent motor to make it run.If you are getting power to this motor from the module, the module is good.If you have no means of checking relay, and the motor is good, change the relay. Even though it is only 2 years old, contacts wear out fast.Check the motor.Pull the lead to the relay, and take it with the other side of the motor, (you may have to cut wire to check) and find a way to supply 120 volts to the motor.It will run without the relay if it is good and you will know for sure the relay is bad.I hope this is helpful to you.Please use caution when doing this, as you can get a shock! Good luck, and keep me updated please. Sincerely, Shastalaker7

  • Robert Horton
    Robert Horton Dec 16, 2009

    Hi, just to let you know, that when you hear of someone speaking of a heat sensor shutting down the fan, what they mean is a blower combination limit switch. There is no heat senor on the unit, just a safety called a high limit switch. The Limit is factory set to turn you're fan on as the heat exchanger heats at a predetermined set point, and after the space is satisfied, burners shut off and fan will continue to run until the fan/limit turns it off at a predetermined set point. I am speaking on the main blower motor, not the inducer/combustion/vent motor. Good Luck, and replace that relay again....Merry Christmas,
    Shastalaker7


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  • Master
  • 576 Answers

I tired to search that model number to get a picture of exactly what we're dealing with and came up with nothing. Please double check the model number. Is this a propane heater? Does it continue to heat when running or does it just blow cold air? If it does continue to heat, I would suggest the thermostat as being the first thing to check. The relay could be sticking, but the thermostat is a much better bet. Unplug the unit and check the thermostat for continuity. It should have continuity when set for a temp above the temp of the room it's in. It should be open when set for a temp below room temp. If this doesn't apply to the heater you have, please get me the complete correct model number and/or a basic description of the type of heater and I'll try to help you. This is based on the only Coleman heaters with blowers I could find on the internet.

Posted on Dec 14, 2009

  • Charles Reifinger
    Charles Reifinger Dec 14, 2009

    Ok, this sounds a bit different than the Coleman heaters I saw on the internet. If the blower normally runs for a bit after the heat cycle then shuts down and now cycles normally but doesn't shut the blower off when cool, I'll have to change my answer. There is probably a heat sensor that turns the blower on when the heater reaches temperature and runs it until it cools down. That sensor would then become the prime suspect, with a stuck relay in second.

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