Armstrong Furnace problem - won't light


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Old 12-08-12, 01:21 PM
J
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Armstrong Furnace problem - won't light

I have an Armstrong furnace (I believe the # is CG80UA075D12A-2) that uses a Honeywell Smartvalve (#SV9520H8026). It worked fine until today... When I adjust the thermostat the circulation fan above the ignitors comes on right away and I can hear a few things click on & off but the ignitors never light and the blower fan at the bottm lever comes on either. Also I notice the LED heartbeat that use to light is not even lit let alone blinking. I was going to start checking the control board for proper voltages but I thought I'd ask here first. Thanks in advance for your help.
 
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Old 12-08-12, 02:09 PM
J
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Ok I found the LED on the smart valve and it's lighting on & off until the furnace cycles & fails...when it's just 6 blinks. Looks like eitther the pressure sensor isn't sensing pressure of the ignator is bad. Looking at these next...
 
 

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