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Do you see the actual ignitor glow? You must be saying that you sanded the sensor. The ignitor, after the little inducer fan comes on will begin to glow a bright orange until the burner lights. If the ignitor is broken, you will NOT see a glow, and you may smell a faint smell of gas.
While holding down the control knob for the pilot, you either have to use the pilot ignitor or match light the pilot. Then old the knob in for 60 seconds, before releasing it. If the pilot remains lit, turn the control knob to ON. If the pilot does not remain lit, the Thermocouple or Thermopile may need to be replaced.
Check your conection off the board to the initor and make sure the pins in the plug are set tight with the connection on the board. If you wire nutted the wiring together for the new ignitor you installed check these connection also. Make sure all wire strands at the wire nuts are in the wire nut and not touching or arching on the furances cabinate.
hi should be by the burner a elctroed rod or a permant pilot you need to be up leval with the burner they are some times not easy to find try and follow the pilot line if there is one or a orange electrode wire ,
The ignitor will light, the blower will start up and run for a few minutes and then the system will shut down, and the blower will continue to run and cool down. The ignitor is not working properly, the ignitor has carbon build-up and need to be removed, cleaned all the black carbon from the ignitor with a little piece of sand paper and replaced, turn the heat back on and this should correct the problem.
Open the front access door and turn ON the heater.
Does the electronic ignitor turn a bright orange?
If not, then it is the ignitor.
If it does turn bright orange, check the thermocouple.
The thermocouple looks like a bare copper wire that is supposed to almost touch the ignitor.
It senses if the ignitor gets hot enough to ignite the gas.
If the thermocouple is loose or not mounted close to the ignitor, then re-position the thermocouple (it is not electrified; however, unplug power cord before doing this). It is also ok to bend the thermocouple if you are unable to loosen its mountiing bracket.
Plug power back on and turn on heater again.
If it fails to flame, you must call for service. The automatic gas valve is stuck. The valve cannot be safely "fixed", it must be replaced.
I hope its the thermocouple out of place.
I can appreciate in the fact that you do not want to offer a solution to my problem without paying money however you would like me to tell you how I fixed my problem for free, if you would like to know how I fixed it, how about you subscribe to my premium plan and I will tell you.
I am experiencing similar issues..the blower you hear is the vent blower probably..mine does the same..it vents the unburnt gas out of the vent pipe thru the roof. you should be able to run the fan manually from the thermostat to at least check and see of the blower works atl..at least it will let you know if the blower motor is ok..I have had to replace the control board once and I think it is the culprit again..mine is sooooo erratic.