Our furnace started acting strangely, only working intermittantly last week. It had to be something simple. The last time we had a problem it cost us $450 to have a new blower motor installed. I'd be damned if that was going to happen again.
To the net and google and '"troubleshoot furnace"! A few minutes later with tips in hand it was time to visit..the furnace. About a minute later the solution..intermittant ignitor module. Back to the net. Ebay..a new one for $88 shipped. Done deal, saved hundreds, gotta love it.
I know nothing about furnaces.