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What is the brand and model of your furnace?
I'm going to open this backup to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.
Can you remove the front panel on furnace and look on label inside for a model number?
That is the gas valve, look on inside panel for furnace model
Let me see if I have a manual. Is there a control board in furnace?
If we have a control board. Turn thermostat to call for heat, hold door switch in and see if we get a blinking light on board
I have to step away just afew minutes but will be right back.Meanwhile see if there is a flame sensor sticking in front of last burner from igniter.If so clean it with light sand paper or a dollar bill. We will go from here.
I am back, you may have to remove a bracket to get to it,Can you attach a photo?
There should be one screw from top holding it in place ,
Can you get to it enough to clean it some?
If not we may have to dismantle
Lets see if it changed anything.Power off and retry
OK we will move on.Can you tell me if the light is blinking a certain number of times, then pausing?Then repeat?
steady or like 3 then pause or 2 then