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Old 01-01-2007, 07:48 AM   #1
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Cozy Propane Furnace Start up Noise


Hello-

We have a small place that is heated by a vented propane furnace. When the furnace comes on, it makes a clanking noise, and the same thing when it goes off, enough to wake you up at night. Is this the cold air contacting the combustion chamber, or just the metal expanding and contracting ?

Any ideas on what might be causing this ?

Thanks.

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Old 01-01-2007, 08:57 AM   #2
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Cozy Propane Furnace Start up Noise


Does the noise sound like soeone punched the duct work,or does it sound like a explosion.

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Old 01-01-2007, 09:33 AM   #3
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Cozy Propane Furnace Start up Noise


Thanks for the quick reply.
The noise sounds like someone tapping on ductwork with a spoon, it starts out slow then gets a little faster and louder, then stops when the unit is hot and running. This noise sequence is repeated when the unit shuts off, when it does the whole thing again.
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Old 01-01-2007, 09:34 AM   #4
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Cozy Propane Furnace Start up Noise


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Originally Posted by NJ Gimo View Post
Hello-

We have a small place that is heated by a vented propane furnace. When the furnace comes on, it makes a clanking noise, and the same thing when it goes off, enough to wake you up at night. Is this the cold air contacting the combustion chamber, or just the metal expanding and contracting ?

Any ideas on what might be causing this ?

Thanks.
Honestly we can guess about all day and night, its not going to make the noise go away and you will still be getting woken up. Since the unit is fired on propane, and propane can be very volitile, I would have the unit service by a pro,and consult with him about the noise while he is servicing the unit.
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Old 01-01-2007, 09:39 AM   #5
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Cozy Propane Furnace Start up Noise


I should mention that the unit is brand new and was replaced once already by the manufacturer, and installed by licensed contractor, and passed all inspections.
The question might also be, is a loud banging noise inherent in the normal operation of these type of units ?
Any other owners out there ?
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Old 01-01-2007, 09:41 AM   #6
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Cozy Propane Furnace Start up Noise


I got to agree with ace on this one.It sounds like the duct work is expanding and contracting causing your problem. But you should have a profesional contractor look at the furnace , just incase.
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Old 01-01-2007, 09:46 AM   #7
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Cozy Propane Furnace Start up Noise


It's a console type heater, so there is no ductwork. I thought it was a problem with the heat exchanger or something else.
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Old 01-01-2007, 10:06 AM   #8
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Cozy Propane Furnace Start up Noise


I would request that the contractor recheck the gas presure and be there to show them the noise you are hearing. The service person should be able to then tell you if thats normal.

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