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Why do I have to reset my furnace (heater) often to get my fan to work? The thermostat works properly but the fan some time is not turned on. Reset the furnace and/or the limit control switch works for a while but the problem will come back.

  • What is the make and model of the unit? Does the heater work but not the fan, or does the whole unit not work? – Tester101 Jan 6 '16 at 17:11
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    Welcome to Stack Exchange. Model numbers? A picture of the limit switch? An explanation of what it means to "reset the furnace"? (Any or all would help.) – Daniel Griscom Jan 6 '16 at 17:12
  • The model is Day & Night 350A. Reset the furnace means power down & then power back up. Everything works, the flame was ignited, the furnace hums but the fan is not turned on. – C Trinh Jan 9 '16 at 15:38
  • Have you turned the furnace off and jiggled the connections to heat sensors and blower motor yet? These can build up insulating oxides over time, and a good jiggle is sometimes all it takes to get everything working again. – Wayfaring Stranger Jan 9 '16 at 16:37
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    I had to replace the capacitor to the fan, $120 part & labor. – C Trinh Jan 12 '16 at 21:28
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You might need a new control board in the furnace or just a relay replacement. Anything more than a once a year reset means there's a failure somewhere.

  • This is a very generic answer, bordering on uselessness. Sometimes it's more useful to request more information, than trying to be the first to answer. – Tester101 Jan 6 '16 at 17:17
  • Sorry to offend. But, a reset should rarely if ever be needed during normal operation. Maybe, I should just forget my personal experience & waste everyone's time with idiotic nonsense. You know, like clueless morons saying a circuit interrupter isn't a circuit breaker & overcurrent is the same thing as an overload. Thanks but no thanks for your advice. – Iggy Jan 6 '16 at 17:40
  • There's no need to be nasty. I'm trying to give you some advice, to help you provide useful help to folks that need it. While it's true that a furnace should not have to be reset. Saying 'maybe replace the control board or a relay', is not an extremely useful answer. – Tester101 Jan 6 '16 at 20:14
  • I appreciate that, but I thought I was quite clear in implying that they should get their HVAC guy or firm out to address the problem & quit the habit of resetting...in other & more precise words. – Iggy Jan 6 '16 at 21:26
  • The only thing you implied, was that the OP should replace the control board and maybe a relay. – Tester101 Jan 6 '16 at 23:50

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