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Lets start by determining if issue is with thermostat or furnace.
Can you give me complete model from inside furnace in burner compartment so I can provide guidance with this specific unit.Model will be on a label just above burners on right or left inside panel
Then look in blower compartment and see if we have a control board with a blinking light.If so tell me the pattern of that flash when it should be on but is not .That will indicate what is wrong and tell us where to start troubleshooting.
OK we need to see what the lights do when it fails. If there is not a window to look in, you will need to hold or tape door switch in to see because when you remove panel door switch pops out and kills power to furnace.
Let m know and we will go from there
Fast or slow?
If power is good and ground is secure you probably have a board going bad.
MIght want to have an onsite verify there is nothing simple that I cant see by internet though.
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