Originally Posted by MrG
Have I mentioned how much I hate owning a house?
I woke up this morning and it was 60* in my house, despite the heat being on. Turns out the heat has decided to only run for about five minutes at a time, and the only way to get it to do that is to turn it off and back on. Fan-fucking-tastic.
It's probably your flame sensor. If you clean it with a cloth (a dollar bill works best actually) it will probably solve your problem. Do a search on you tube for directions on how to do this; it is actually pretty easy.
I had the same thing happen a couple of years ago. My heater was only 5ish years old and it started to occasionally only work for 5 or so minutes at a time. I had a repair guy come out and quote me $400 to repair something, the mainboard I think. I ended up doing some research, fixing it myself, and saving a little bit of money.
I know this isn't in the spirit of the forum in general, but I hope this information helps you