Question about Coleman Home Electric Furnace Eb15b/Eb15d

1 Answer

Blower fan continually runs

I had trouble with the heat only blowing warm air. I replaced the sequencer and it fixed that trouble. It was working fine then the blower fan came on with the heat and will not turn off even after the heat goes off and cools down the heater coils. Could the sequence be defective again?

Posted by Anonymous on

  • little bulls Oct 11, 2015

    Hi Anonymous, Imeanthe fan control may be set to low, not too high. Set at 50 f, it will never get that cold to tell it to shut off

  • John Beckman
    John Beckman Oct 21, 2018

    there is no adjustment on fan control relay

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little bulls

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It may be but the fan control may be set to turn off at to high a temp, or theres a short between ;r; and g at the stat or furnace or sequencer, IF it runs through it. A limit or rollout switch may have failed but this will keep the unit from firering. Check for a manual blower switch that may be on. At stat it should be at auto and alsso at the fan control. A stuck relay is always possible,

Posted on Oct 11, 2015

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txinspector

Raymond Richards

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SOURCE: Electric furnace fan works heater does not

coil could be broken. open the cover hold the door switch and look to see if the coil glows when the heater is turned on if not turn off the power then remove the coil then turn on the power and check the voltage you should get 210V A/C on a meeter if you do or yo can do this firs, check for continuity on the coil if you get continuity then check for voltage. if no voltage check the breakers or check the breakers first the electric heater needs two breaker if one is tripped you could have a blower and no heat.

Posted on Oct 09, 2014

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Tractorman44 thanks but misunderdstood husband! When thermostat turned up the fan comes on before flames ignites. Plenum heats and furnace runs.


If the fan comes on first, then the flame ignites, it USUALLY indicates there is a problem in the ignition process of the furnace. Most new manufacturers have the adjustable 'time off' sequence for the blower, and most initiate a call for the blower to run within a pre-determined amount of time AFTER a call for heat has been established. ALSO, and this is where I think the problem is, the ignition sequence starts immediately upon a call for heat. If there is a heat ignition failure, it will attempt a restart. USUALLY, they allow 5 restarts within a certain timeframe then the circuit board locks out the heat sequence until it is reset by cycling the power or cycling the thermostat manually.

What I think is happening with yours it that your ignition sequence is experiencing a 'flame failure' upon a call for heat....then it re-establishes the ignition sequence, which takes another 30 to 45 seconds. During this time, the blower automatically starts (because the allotted time has expired) and blows COLD air because of the initial flame failure. In the meantime the ignition sequence establishes a flame on the second or possibly the third try and then you feel the warm air.

IF this is the case, ultimately what will happen is that the furnace will continue to experience 'flame failure' and eventually fail to the point of 'flame failure lockout' and you will have no heat, but the fan could possibly run continuously.

At any rate, without being able to be there to troubleshoot and test components physically, this is just a calculated and reasonably reasonable guess. What it is telling you is that you probably need to contact a reputable, reliable service organization to give your furnace a good going over before it lets you down on a good cooooold night!!!

I hope this helps you understand the basics of what happens within the system and bear in mind, this is a 'generic' sequence and possibly NOT the exact sequence of your particular furnace.

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You must have an electric furnace, gas furnaces only come on when the heater is warm. Electric heaters come on with the use of a sequencer. Your sequencer, tstat, and blower is fine, which means you must have broken heating element. I have a nice pictoral of how to restring one HERE

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

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I have a coleman evcon electric furnace ,it was running and would not cutoff the heat got up to around 90 thhe thermostad said it was running in aux ,so I turn the main breaker off and the in a few minute...


If the thermostat is ok which it probably is then your sequencer is most likely stuck i would say. You could verify that by removing 24 volts to the sequencer to see if it will shut down the heater
themobilian_598.jpg When low voltage from the thermostat is applied at the base of this sequencer it heats a bi-metal and turns on each coil and fan in a sequence that will insure the breaker don't throw from the power surge AND warm air comes out the vents when that fan comes on. I would start there.

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

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I was leaning towards a bad contactor. Either sticking sometimes or not making good contact. I would inspect the contactor for pits or burn marks near the contacts. DO SO WITH POWER OFF of course...but, what's the reset button you are referring to?? I'm assuming this is a heat pump, please send model number!!

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

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