Frame furnace not lighting


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Old 03-20-12, 03:20 PM
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Frame furnace not lighting

My furnace igniter seems to heat up but I am not hearing any gas sound. I cleaned the flame sensor and replaced it, because it was acting like a sensor issue. (starts then shuts off). Now it isn't even lighting.

Any help would be awesome
 
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Old 03-20-12, 04:30 PM
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It is a TRANE furnace, stupid auto spell
 
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Old 03-20-12, 05:21 PM
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is the gas valve switch set to on? What error flash code are you getting from the control board? Do you have a volt meter and know how to use it?
 
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Old 03-21-12, 06:59 AM
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2 flashes (lockout from too many attempts)
I checked the gas switch
I have a multi meter.

I am suspecting the gas solenoid. Would a weak igniter possibly cause this also?
 
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Old 03-21-12, 02:45 PM
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after the ignitor warms up you should see 24VAC at the gas valve. Typcially there is no such thing as a weak HSI. Depending on the exact model of your furnace you should see 120V applied to the HSI during warm up.
 
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Old 03-22-12, 10:46 AM
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After the ignitor heats up for 20-30 seconds or so, the circuit board should switch on 24 VAC to turn on the gas valve for a period of a tleast three seconds. Use your multimeter to measure the voltage across the gas valve to see if that voltage is being turned on.


Just as HVAC Tech suggests....
 
 

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