Can Closing Too Many Vents Cause Problems?? - HVAC - DIY Chatroom Home Improvement Forum

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Old 12-27-2009, 01:28 AM   #1
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Can closing too many vents cause problems??

Newbie here hoping to mine some info. Can closing to many heating vents (to save $ basicly) cause a furnace to lockout due to things like back pressure, overheating, excess condensate or whatever? I had closed 4 of 10 vents and, after several cold weeks, the furnace quit working after a few cycles or sometimes altogether. (In my case, this is a 19 yr old high efficiency furnace) I reopened all vents and room doors and the furnace seems to work again as it should. Just coincidence??? Thanks, Michael


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Old 12-27-2009, 04:21 AM   #2
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Closing too many vents can cause the furnace to over heat.

Also. Check your air filter, may be time to replace it already.


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Old 12-27-2009, 06:36 AM   #3
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By closing too many vents you are placing the furnace in an out of balance condition. It will overheat.
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Old 12-27-2009, 08:26 AM   #4
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If you want to close vent. Just put fan motor on high speed ( red is for heat and its on low speed) Note if you do put it on high speed it may run longer.
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