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    just_wondering's Avatar
    just_wondering Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jun 21, 2009, 10:23 AM
    Fan runs in Auto but not Manual mode?
    Gas furnace is about 32 years old. This summer I noticed that switching the Fan to run in manual mode, 90% of the time it will not turn on. Suspecting the thermostat, I installed a new 7-day programmable type. 1st time I tried manual fan it worked OK. Most of the time fan will not turn on using the manual 'on' mode. Here's the strange part, if I turn on the A/C in the Auto mode, the fan so far has never failed to run. How can the fan never fail to start when running the A/C but when I only want to run the fan, it usually doesn't start? If I play with the manual switch I may get lucky and it starts. Wiring connections are clean and tight. At first I thought the fan switch on the old thermostat was intermittent, so I installed a new thermostat. Any ideas would be greatly appreciated. Thank you!
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Jun 21, 2009, 08:13 PM
    32 years old
    I know this isn`t answering your question but I would be afraid to go to sleep with a furnace that old running in my house. I hope you regularly have it check (closly) by a professional HVAC tech
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