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Coleman central electric furnace model 3400-815 heater gets warm but fan may not start running. Could this be a sequencer? Maybe the fan relay? Getting cold over here.

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  • Coleman Master
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Sounds like the automatic fan control not going on at temp rise

Posted on Dec 29, 2016

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Posted on Jan 02, 2017

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Why wont the blower on my coleman eb10b come on when i turn on the heat? Low humming noise from unit is all. Unit is all elec.


likely need to change the thermostat configuration to electric rather than gas. does it heat when you put the fan in the on position and call for heat?

Jan 07, 2018 | Coleman Heating & Cooling

2 Answers

Furnace fan will not stop running till you pull out fuse


Most likely the fan relay is defective or the electric heater is defective. If the fan will not turn off, the cause is generally the electric heat is being back feed from a defective heat strip., Recommend call pro. If so inclined, remove power, breaker etc find 1/4or 5/16 driver and Remove panel from the ah. Look for the fan and follow the wires back to the relay( this is usually black,for high speed, blue for.med and red for low ) Follow the fan speed tap to the relay. If the relay is burnt or looks defective replace this part. If no defect is obvious remove the wire from the NC (normally closed) connection. Plug the power and check to see if the fan starts with out command. If the fan starts it definitely the relay. Note the wire removed from NC might be hot check with meter if it is and the electric heat is signalling the fan to run and most likely source of defect is the heat sequencers, (switch relays for high voltages) replace this part

Nov 27, 2016 | Heating & Cooling

1 Answer

Blower fan continually runs


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,

Mar 08, 2015 | Coleman Home Electric Furnace Eb15b/Eb15d

1 Answer

I have a coleman evcon electric furnace. The blower fan runs constantly, the switch is in auto and the fans runs even when the thermostat is shut off.


Most likely on that particular electric furnace you have a fan sequencer that is closed (stuck shut). It is the black relay that you are looking at when you take off the furnace cover to access your heat strips. You should have a red wire coming from the blower motor that plugs into the side of it. If you have a ohm meter turn power off and remove wire. Check resistance across the sequencer and it should read OL. If you have resistance across it, the relay is bad. Replace it.

Nov 28, 2013 | Heating & Cooling

1 Answer

Electric furnace will not turn off


Your sequencer is stuck. A sequencer uses a small coil to warm up the switch so that it will turn the electrical elements on one at a time instead of all at once. If they all come on at once the amp draw would throw the breaker. It is also desired to have warm air come out of the vents when the fan comes on. So how do they do it? With a sequencer:
themobilian_3091.jpg
A sequencer can have up to 4 stacks depending on the amount of coils are in the heater. Each coil on average has a value of 5000 watts. So what ya want to do is turn on a coil then after 30 seconds another coil then after 30 more seconds the fan and maybe another coil depending on your furnace size.
So in your case what is wrong? The sequencer bimetal disc inside it is jammed in the on position and therefore the heater stays on until you tun the breaker off. Replace the sequencer and party on!
themobilian_3092.jpg

Here is a page on sequencers that also features rewiring of an electric furnace

Oct 28, 2011 | Heating & Cooling

2 Answers

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.

Dec 28, 2010 | Coleman Heating & Cooling

1 Answer

Fan relay or sequencer.


If it were the sequencer, the heat wouldn't come on at all but the fan would blow. It's the fan relay but it could be the t-stat again. If you get a power surge when the unit is running, it can short out that portion only but typically, it will short out either the heat or the cool side depending on what is running not just the fan.

Feb 28, 2009 | Better Living SPP High Efficiency...

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