Furnace makes clunking noise when starting to cycle

11-05-2012, 09:24 PM	#1
straightsix Newbie   Join Date: Nov 2012 Posts: 5	Furnace makes clunking noise when starting to cycle Its a Rheem 90 high effiecincy . when it starts to turn on to cycle, i can hear a few clunky sounds right in the begining. Furnace seems to work fine and blows warm air but the noises seem unusual. it does not have pilot light, so i thinkin it might be the ignition coil thing, but not sure. any ideas? this normal?

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11-05-2012, 09:34 PM	#2
how Member   Join Date: Feb 2011 Location: Vancouver BC Posts: 1,410	Furnace makes clunking noise when starting to cycle When the thermostat first calls for heat, the first thing you'll hear is the inducer motor starting up. Is the clunking sound the first noice you can hear from the furnace starting up?

11-05-2012, 09:45 PM	#3
ben's plumbing Member   Join Date: Oct 2011 Location: pa Posts: 3,182	Furnace makes clunking noise when starting to cycle sounds like something on inducer motor..thats the 1 st component to start on call for heat...ben sr

11-05-2012, 09:51 PM	#4
straightsix Newbie   Join Date: Nov 2012 Posts: 5	Furnace makes clunking noise when starting to cycle Yes it is the first thing i hear when it starts. The noise is normal then?

11-05-2012, 09:53 PM	#5
Doc Holliday I'm Your Huckleberry   Join Date: Mar 2011 Posts: 5,052	Furnace makes clunking noise when starting to cycle I've come across a few furnace cabinets that as they expand or contract due to temp differentials the metal cabinets POPS. __________________ Thanks.

11-05-2012, 09:53 PM	#6
ben's plumbing Member   Join Date: Oct 2011 Location: pa Posts: 3,182	Furnace makes clunking noise when starting to cycle Quote: Originally Posted by straightsix Yes it is the first thing i hear when it starts. The noise is normal then? no its not normal to hear a clunking sound...something is wrong inside inducer motor.

11-05-2012, 10:59 PM	#7
straightsix Newbie   Join Date: Nov 2012 Posts: 5	Furnace makes clunking noise when starting to cycle Oh ok. Thanks for the replies. I truly appreciate it