furnace won't fire
If the nipple isn't clogged, pull off the hose completely and check it for obstructions. Also poke the nipple at the sensor. If that doesn't work, pull the combustion air duct off the top of the unit and make sure it's drafting. You should feel air turbulance at the duct opening. If it's not drafting, you probably have a bird's nest or leaves stuck in there.
If it's not the air sensor, then it may be something serious like the control module. Run the furnace and let it shut down of it's own accord, open up the combustion chamber on the bottom and check the LED code. It will probably be blinking, or perhaps have an error code. Check this against the troubleshooting guide in you owner's manual.
The unit will not run with the combustion chamber open, so you will have to put the access panel back in place to see if its working.
- 15 Old House Features We Shouldn't Abandon
- 13 Lazy Cleaning Tricks for a Spotless Home
- Laundry Room Ideas to Knock Your Socks Off
- Insanely Easy 60-Minute Home Improvements
- 12 Sheds You Could Live (or Work) In
- Assembly Required: 15 DIY Kit Homes
- 7 House Sounds You Never Want to Ignore
- 10 Surprisingly Simple Woodworking Projects
- Worth It: 8 Renovations That Pay You Back
- Organize Your Life with 12 Dollar-Store Buys
- 9 Totally Amazing Mobile Home Makeovers
- Don't Make These 7 Mistakes in Small Spaces
- 16 Sneaky Storage Ideas
- 15 Totally Unexpected DIY Flooring Alternatives
- 7 Easy Budget-Friendly Backyard Makeovers
- 10 Closet Cures That Cost Less Than $100
- 11 Easy DIY Projects to Declutter Your Home
- 10 "Zero Dollar" Garden Hacks
- 10 Killproof Plants for a No-Effort Landscape
- 9 Insanely Easy 1-Hour Backyard Projects