Heil Gas furnace blowing cold air after being off all weekend

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Old 02-04-13, 03:53 AM
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Heil Gas furnace blowing cold air after being off all weekend

Hi I have a gas heater in the basement that will not blow out any warm air. I was on here a few weeks ago and changed the thermostat and that seemed to make the heat blow warm air. I was gone all weekend and turned off the heat. Came back and naturally it was cold thermostat said the house was 44deg. I turned the thermostat to heat, it blew warm air for about 15 minutes then cold air. Kept turning thermostat on and off throughout the night and nothing but cold air blowing out of the vents. Please advise on what to do. In Pennsylvania in the 20s outside and I can't have the house this cold again tonight, I have three little girls. Do I have to reset something? I am trying to avoid spending a ton of money for a service call if possible. Thank you so much. Pics following.
 
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Old 02-04-13, 08:51 AM
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Be careful turning the heat completely off in the winter.
Allowing the walls to become too cold can lead to pipes freezing.

If you had heat for a short while before blowing cold....one place to start is check the filters. If the furnace doesn't supply a proper flow of air it can fail on high heat.

Also your furnace uses a Honeywell smart valve which should be checked out by a pro.
 

Last edited by PJmax; 02-04-13 at 09:19 AM. Reason: additional info
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Old 02-04-13, 10:45 AM
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Thank you! I did call for service today and they replaced the smart valve. Not cheap but it's all fixed.
 
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Old 02-04-13, 10:47 AM
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Great - thanks for the update.
 
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Old 02-04-13, 02:46 PM
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smart valves are notorious for failure.
 
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