Loud Buzzing when turning gas switch from "pilot" to "on"

mikemeenan1 · 10-19-2009, 02:43 PM

I have a carrier gas furnance for a forced air heating system. im trying to turn my heat on. The fan motor runs fine when the red gas switch is either on "Pilot" or "off" but as soon as i turn the red gas switch to the necessary "on" position it makes a very loud and troubling buzzing sound. I believe it is an electrical buzzing, and the sound is definitely coming from the gas part of the furnace and not the mor itself. I'm relatively handy, but have been out of work for a year. The last thing i need right now is to have to pay for an expensive repair bill or to have to replace my furnace. Can anyone help me diagnose and fix this problem? \
Thanks
mike

SKIP4661 · 10-19-2009, 06:51 PM

Does the buzz go away when the thermostat is off?

Plumber101 · 10-19-2009, 07:54 PM

Either the transformer is getting weak ot the pull in coil in the gas valve has excessive resistance

I would start with the transformer

10-19-2009, 02:43 PM	#1
mikemeenan1 Newbie Join Date: Oct 2009 Posts: 1	Loud Buzzing when turning gas switch from "pilot" to "on" I have a carrier gas furnance for a forced air heating system. im trying to turn my heat on. The fan motor runs fine when the red gas switch is either on "Pilot" or "off" but as soon as i turn the red gas switch to the necessary "on" position it makes a very loud and troubling buzzing sound. I believe it is an electrical buzzing, and the sound is definitely coming from the gas part of the furnace and not the mor itself. I'm relatively handy, but have been out of work for a year. The last thing i need right now is to have to pay for an expensive repair bill or to have to replace my furnace. Can anyone help me diagnose and fix this problem? \ Thanks mike

10-19-2009, 06:51 PM	#2
SKIP4661 Member Join Date: Dec 2008 Location: West Michigan Posts: 440	Loud Buzzing when turning gas switch from "pilot" to "on" Does the buzz go away when the thermostat is off?

10-19-2009, 07:54 PM	#3
Plumber101 GC/Master Plumber/Mech Join Date: Feb 2009 Location: Hays, KS Posts: 1,467	Loud Buzzing when turning gas switch from "pilot" to "on" Either the transformer is getting weak ot the pull in coil in the gas valve has excessive resistance I would start with the transformer __________________ John Wayne once said "Life is tough and it is even tougher if you are stupid" Tempstar and Trane Dealer

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Loud Buzzing when turning gas switch from "pilot" to "on"