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Old 10-29-2012, 04:54 PM   #1
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Ignitor voltage question


I have an Armstrong Ultra Tech 80 furnace that won't light. The inducer blower comes on for about 30 seconds then shuts off and the ignitor never starts to glow. Things I've tried:

I checked the hose to the pressure switch and the nipples - all are clear. I can get the pressure switch to click by sucking on the opposite end of the hose. I also jumped the contacts on the pressure switch and cycled the heat with the same results. I'm getting 24V on both sides of the pressure switch to ground. The flue is clear.

I cleaned the residue off of the heat sensor with steel wool.

Nothing works to get the ignitor to heat up and glow. The element in it doesn't look cracked or broken. I put a voltmeter on the connections to the ignitor with it unplugged, cycled the heat and didn't get a change in voltage. It just stays at zero. Shouldn't I get a change in voltage from the leads to the ignitor at some point when the inducer blower comes on?

Not sure what else to try. Any ideas? Thanks!


Last edited by stu7777; 10-29-2012 at 05:10 PM.
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Old 10-29-2012, 05:05 PM   #2
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Ignitor voltage question


Sorry, the LED code is 3 flashes.

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Old 10-29-2012, 05:41 PM   #3
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Ignitor voltage question


No voltage = bad controller board.
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Old 10-29-2012, 05:54 PM   #4
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Ignitor voltage question


Not positive but believe the HSI voltage comes from the smart valve on that one. If so those gas valves are nothing but trouble.
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Old 10-29-2012, 05:59 PM   #5
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Ignitor voltage question


The wire to the ignitor comes from a molex type connector that plugs into the top of the gas valve. I think it's a Honeywell.
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Old 10-29-2012, 06:06 PM   #6
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Ignitor voltage question


That's your answer then...new gas valve.
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Old 10-29-2012, 06:18 PM   #7
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Ignitor voltage question


Try putting alittle sideways pressure on square plug connector.Sometimes this will get it to come on.Ive used pieces of folded paper in a pinch to keep pressure on plug untill new valve can be installed.

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