Ignitor will not ignite

tonk1 · #1 Nov 3, 2007, 04:40 PM

I have a intertherm honeywell furnace about 6 years old and the ignitor will not ignite so furnace will not turn on... I put in a new ignitor in but still will not ignite... Is anybody out there familiar with this problem and can direct me in the right direction...Thank you very much....Paul

wmproop · Nov 3, 2007, 06:11 PM

is everything else working? the induction motor,that comes on and clears out excess gas befor it tries to light,,,,,,,,,,how about main blower?,,,,set your thermostat on fan only mode,,,,does the blower work,,,,,,if not check fuses and/or breaker,,,be sure ther is 120 volts going in,,,,,,

labman · Nov 3, 2007, 06:33 PM

Go to the sticky at http://www.askmehelpdesk.com/heating...ons-58313.html

Work through the sequence of operations and check the sensor for the last thing that happened. The ignitor will not heat up until the control board gets the signal the inducer is running.

tonk1 · Nov 3, 2007, 11:58 PM

Yes the induction motor is running and pressure switch is opened... And yes the blower also works.
I don't have a multimeter to test power. Everything seems to work, Its just not firing... or its not getting the signal to fire... Also... this is probably a good thing, But I can't smell gas...could this also be a problem.Thank you again for your reply....Paul

wmproop · Nov 4, 2007, 01:13 AM

no,,,you won`t smell gas,,,,the gas valve doesn`t open to let gas out till its told to by the control moduel,,,,and that won`t happen untill the igniter is working,,,all works in sequence

labman · Nov 4, 2007, 06:56 AM

Do you actually hear the pressure switch click? If so, check its connections to the board. Also, check the connections to the ignitor. I don't think there is a sensor for the ignitor. The control board gives it time to heat up, and then opens the gas valve. If the flame detector doesn't detect a flame, it shuts the gas off after a few seconds. I think you have a problem with the pressure switch, ignitor, or perhaps the board. Does the board have an LED that flashes when the furnace doesn't start up? Is there a list of codes on the cover or somewhere?

tonk1 · Nov 4, 2007, 09:48 AM

Yes I can hear the click as soon as it comes on and right after, the induction motor turns on...Yes there is 2 led lights, One is red and it is a control module status indicators and it flashes two times and the code says "2 flashes Pressure switch is open with inducer on" and the Yellow is off and code says "steady OFF No flame signal".,,,,,,,,,,,,,,

tonk1 · Nov 4, 2007, 11:53 AM

I got it,,, It was the perssure switch stuck open i tapped it with a handle of a screwdriver and it came on... Thank you for your help...Great web site,,,,,,,,



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