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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 brand and model number of your unit?
It's on the rating tag which is usually inside the burner compartment. If it's not on the front of the panel look on the sides inside the compartment. You'll have to remove the burner compartment panel first
No, it should start with a G. The BTU rating for the unit will also be on the tag
Ok, give me a few to look up the specs for this model
What happens when it starts up? does it (the small draft inducer fan on the front) start up? are you getting a flashing LED on the control board inside the blower compartment? if so how many times does it flash before it pauses and repeats?
Ok, there are a few things we can try to troubleshoot this it will involve some minor wiring (jumping the thermostat terminals) and voltage testing if you have a meter to test. Do you have a meter? are you up for this troubleshooting?
Well, if it won't work all we can do is troubleshoot. If you'd rather not then you'll have to call in a pro to come out and fix it. But first are you sure you have power to the unit? can you see a small LED lit inside the blower compartment? If not double check the breaker and any switch near the furnace.
If it's inside the main blower compartment then yes that's it and you have power so there's nothing more you can do yourself