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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:--- http://toad.net/~jsmeenen/wiring.html------
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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The problem you describe is typical of 'stuck' contacts within the sequencer.

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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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