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when this first happened was the filter dirty? I know clean now
and which model do you have?
Can you access the ignitor? This is a ignition failure and if you do not see a glow it is cracked....once it tries to start does the gas valve click?
The ignitor is easy to replace but a bit time consuming. You have to shut gas off by furnace, unhook gas pipe and remove screws holding the gas gun on front wall....pull assembly out...and replace ignitor.
Here is a manual for a little help.
great..once you rate service you have 30 days of follow up so return here if you need anything else.