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Old 12-07-2008, 08:22 PM   #1
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Furnace short cycling


Hi,


I think the furnace in my cabin may be short cycling. It's a 10-15 year old high efficiency Rheem furnance. I noticed that the burner only runs for 60 seconds before cutting out only to refire again in 2-3 minutes and run for another 60 seconds and so on. Here's what I know so far:
  • Fan blower motor runs all the time. (stat doesn't have a Auto/On setting)
  • Vent motor seems to be working - I can stand outside and hear it run and watch it exhaust.
  • It's not cutting out because the temperature has been met - it only caught up to the set point during the day yesterday.
It was -2 F this morning and I was still able to hold 58 degrees in the main part of the house. Luckily I have a wood stove in the addition that keeps that part of the house toasty.

What could some possible problems be?

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Old 12-07-2008, 10:44 PM   #2
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Furnace short cycling


Check the condensate trap, it might be plugged up. Should be located in the blower section.

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Old 12-08-2008, 11:46 AM   #3
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Furnace short cycling


I'll double check it, but I don't think it's plugged. It's draining condensate pretty well.
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