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The other day I received a series of tests to perform on our Coleman EB20B electric central heater. A while back I replaced the sequencer. I may not have replaced each wire on the appropriate spade connector. The sequencer is a double stack. Each stack works two heating elements. The fan works with the thermostat switch on fan and the H/C switch on off. But nothing works with the fan switch on auto and the H/C switch on H. Is there a way I can be sure the wiring is correct? We have a schematic for the heater including the sequencer. Our diagram shows letter/numbers at each connector on the sequencer, but the replacement sequencer didn't have the letter/numbers.

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  • Kenneth Rohm Nov 13, 2009

    Thanks again for your great help Charlymonty.



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the wiring diagram instructions are given step by step on the link below with proper color details for each wire so that you can check the wirings accordingly.the link is given below:---
click the link and see the wiring details color wise .---- This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya.

Posted on Nov 13, 2009


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Continuous blower operation could have been a user selection. Some thermostats allow this.

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It sound like your first stage sequencer is stuck in the 'on' position Shad. Usually the first stage is responsible for turning on the blower on low speed while energizing the first 5 kw of electric heat.

The problem you describe is typical of 'stuck' contacts within the sequencer.

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I have a coleman central electric furnace model 3400-815 and a wire that connects the sequencer to the element burnt out. I'm not sure what caused the burn out so I don't know which part needs to...

The wire was probably loose on the terminal. This is very typical. Replace the wire end with a new spade clip. Make sure it pushes on to the terminal real good and tight and you probably won't have another problem.

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Sounds like an airflow restriction. If you remove cover you are giving the fan all the possible air it can get, therefore it seems to run properly.

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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.

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1 Answer

When we turn on the central air there is a strong burning burnt toast but way stronger. IS it safe to remian in the house?

Is your central air furnace or electric heat. Electric furnace sometimes have electric strip sequencer stick in the closed positions leaving on one strip of the electric heat. Get a service tech as soon as possible to check this out. Any smells from a central unit need to be teken care of promptly. TURN OFF unit you have it checked for your safety. Rus

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