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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.
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pinknblu
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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
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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
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