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Is there a way to check for gas pressure even if just a slight loosened connection to hear it then quickly re-tightened. Otherwise the main valve is not working as it should and will need to be serviced or replaced. Thats all i got.
The Thermocouple or Thermopile has failed and needs to be replaced. The Thermocouple is a safety feature that keeps the pilot burning if all operations of the gas valve are safe. If the pilot burns, the burners will light. The Thermocouple shuts off the gas control valve if the pilot goes out.
Several steps here to check...
turn power off unit and back on
set thermostat to heat
watch for pilot to ignite..igniter should glow orange or cherry red or spark if its a spark type ignitor
Did you see a pilot light ignite?
If not you probably have a bad igniter.
If pilot lit....in a little bit you hear a click of the gas valve opening..then the main burners will ignite
If you see the pilot and the main burner lights but goes out in a few minutes or immediately you may have an issue of the "high limit" switch tripping.
Is the blower fan turning that blows air out of your vents?
are all your vents open in your house? too many times i see homes with almost all vents shut.
There will be a web or bug or debris in the pllot asssembly /rail that blocks the path of the transition to main burner or ignition of pilot assembly itself, when it does ignite, theres too much gas built up in the pilot ignitor area and it explodes, clean the orifices in the pilot asssemblt / and or the pilot rail or main burners orifices at the pilot area.