Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

1 Answer

Inducer and ibm turns on and stays on no heat or cooling

It is a honeywell furn the fans run nonstop no matter what the stat says. its a spark ignitor not getting a spark gas valve does not click on so its not getting any gas. the fan runs off the heating terminal on the board. even when in cooling mode the heat term is running 125 v and cooling term for fan has nothing. i shut if off form the kill switch let it reset for two min and nothing dif. im guessing the bord is shot or could it just be the fan relay? if you need anymore info plz let me know.

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  • tycoon7885 Nov 18, 2008

    i also forgot i jumped out the R and W terminal on the board to heat up the house and nothing happened no ignition or spark fans continued to run and didnt turn off. the stat is new and wires are all hooked up form the stat to the board correct.

  • tycoon7885 Nov 18, 2008

    yes the problem was there before the new Tstat and there is 25 volts between the R and C and the W and C sorry i forgot to say that. i will kill the power to the furnace itself to see if that resets the fan and post what happens just so other people know that might read this.

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Check to make sure you have 24-28 volts between R and C. If you do, you probably have a bad board but you also need to verify that you have the same voltage between W and C on a heat call if not then it could be something in the tstat ot he wires (jumping R and W pretty much rules this out).
The Kill switch may not reset the board, kill the power to the furnace itself.
Was the problem there before the new tstat was installed?
Also on some models continuous blower is initiated by a "kicked" roll out switch or and overtemp condition, Check for continuity on the whole safety circuit.

Posted on Nov 18, 2008

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electronic spark type units have a high voltage low amperage spark that is AC. Fire rectifies electricity that passes through it meaning AC becomes DC ! Fire is a terrible conducter however as a result , the DC signal is only milliamps/volts signal strength. the DC prescence is proof a flame exists for pilot, and safe to commence to mainburners.

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