1

My heating system only blows out cold air, not hot. I've left it on for a good 15 minutes to see if it will warm up, and I get nothing but cold air. I've even put it on Auto and waited some more, but still all I get is cold air.

What could be the problem?

Niall C.
  • 20,709
  • 17
  • 90
  • 131
pinknblu
  • 27
  • 1
  • 1
  • 2
  • 4
    Can you tell us what kind of heating system you have. It's impossible to even guess without knowing that. – Niall C. Sep 24 '11 at 18:56
  • 1
    -1 Without more details, this question can't be answered and should likely be closed. – BMitch Dec 14 '13 at 15:53
  • Pinknblu all answers and comments already posted are the only thing anyone can say unless you describe the system you are refering to that won't warm you up. Please try giving all pertanent information if you actually need the answers you're looking for. Chances are by now the heat in on though. ;) :) – Richard Feb 17 '16 at 22:02
  • See https://diy.stackexchange.com/questions/3653/why-is-my-furnace-blowing-cold-air – rogerdpack Nov 09 '20 at 03:04

2 Answers2

5

Several possible issues:

  1. Bad thermostat
  2. Pilot light out (if a gas furnace with a pilot light)
  3. Heating element out (if electrical furnace)
  4. It's cold outside (if heat pump - coupled w/ #3)
  5. Electronic ignition shot (gas furnace w/ no pilot light)

Without more information, that's the best guess I can make.

The Evil Greebo
  • 25,781
  • 16
  • 88
  • 124
3

Turn off the furnace, remove the thermostat, touch the R and W wires together (as well as R and G), and then turn it back on and see what you get. If this works, then your thermostat isn't calling for heat correctly, but the fan is operating when it attempts to.

Aaron
  • 6,351
  • 7
  • 37
  • 60