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rhw

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flame sensor, my electric igniter is working, I clean the flame sensor, but unit still kicks on for 5 seconds then flame goes out, what could be wrong
 
Do you have a meter and a schematic or parts list?
I'd be looking to see what the flame sensor output is doing and what else besides a "no flame" condition can shut off the gas valve and at what point in the startup sequence.
 
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Could be many things preventing the firing of the burners. Flame sensor being one.
Do you have any blinking trouble codes on the control board?
 
rhw said:
flame sensor, my electric igniter is working, I clean the flame sensor, but unit still kicks on for 5 seconds then flame goes out, what could be wrong

No codes on board green light is solid no planking,plus I jumped the R and W on thermostat, to check limit switch
 
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