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My furnace runs but blows cold air, gas is on

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  • Contributor
  • 46 Answers

Need model number and brand name. Approx. age.

Posted on Nov 27, 2013

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Posted on Jan 02, 2017

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Accurate Joe
  • 61 Answers

SOURCE: Electric furnace blows cold air before and after warm air.

It is normal. Your house has to go down a couple more degrees because the heat pump is not working. You can solve this by rewirng you thermostat. Take off the wire that goes to Y and tape off. Then take the wires that are marked w and e or w1 and put the wires to yellow. Do not run ac with it wired like this. If you need more information please post me back

Posted on Nov 29, 2008

solveditnow
  • 39 Answers

SOURCE: (HVAC) Furnace Not Igniting Quickly

Make sure a back draft in the flue is not happening. Wind can blow it out until the flue heats up. The flame sensor may not be close enough to the burner flame. It may be weak and need to be replaced or if its an optical one it may be dirty and not see the flame very well. Its not wasting much gas but it puts extra wear and tear on the gas controls, is noisy, and, as you said, blows cold drafty air. A gas control system that has issues of any kind is not real safe. It needs to get fixed.

Posted on Jan 08, 2009

koolbreezes
  • 540 Answers

SOURCE: furnace not blowing hot air

Also did you check to see if you added a jumper wire to the thermostat rc--rh ! R-means power to C-(cool)_--- r-power-to rh is( heat)! TYVM!

Posted on Dec 08, 2009

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Home owner's manual? Troubleshooting section. Gas or electric?
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Turn power off & on again. Watch to see if it cycles...it could be the hot surface igniter if you don't see it turn bright orange. If it goes straight to blowing cold air, then normally it is a limit switch open- mostly manual reset - thermal disc-located around flame rollout.

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1 Answer

(HVAC) Furnace Not Igniting Quickly


Make sure a back draft in the flue is not happening. Wind can blow it out until the flue heats up. The flame sensor may not be close enough to the burner flame. It may be weak and need to be replaced or if its an optical one it may be dirty and not see the flame very well. Its not wasting much gas but it puts extra wear and tear on the gas controls, is noisy, and, as you said, blows cold drafty air. A gas control system that has issues of any kind is not real safe. It needs to get fixed.

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Hello , I think I can help , It sounds like the gas valve as long as your sure there is plenty of gas going to the unit and you have an electronic ignitor , if there is a pilot light its not electronic. the gas valve should come as an assembly to install and its pretty easy to complete. Let me know if you need more help. Good luck

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