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Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. First I’ll need some more info so I have a more complete picture of you situation.
What is the model number of your furnace? what are you getting for an LED flash sequence?
That's a series not a model number. I need the model number off the rating tag. Also how old is the unit?
When the burner fires up what does the amber flame LED do?
Ok, if the flame LED flashes the signal from the flame sensor is marginal. If the lead from the sensor is good (no defects, solid connections) then you might have a bad ground between the furnace chassis and the board. The voltage generated by the flame sensor is minuscule. A bad board ground can introduce stray voltage. Of course I'm assuming the flame sensor is dead square in the flame and is heating up.
Sounds like it could be a bad board. What happens when it doesn't light? does the igniter initialize? if so do you have 24 vac to the gas valve?
Do you mean no flame LED?
When you say "after that no light" do you mean the flame LED doesn't light up at all?
So you have 24 volts at the gas valve and no ignition? no burner flame?
no burner ignition?
Ok assuming the flame is normal when it does fire up we're back to bad board or bad ground
Furnaces are usually good for 20 years before they cost too much to fix. If you're going to do this then I'd try a new board. You should get another 7 to 10 years out of this unit.
Do you have more questions?
I'd appreciate a favorable rating