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i have a pair of YORK furnaces installed in my basement. Once a while one of them starts making unbearable rattling noise - maybe once every couple weeks, and the noise lasted, i don't know, hours?

I looked for the source of noise and found it's from this little guy - see below

enter image description here

Model: VCMA-15ULS

enter image description here

Little Giant Pump Company, Oklahoma City, OK

My apology that I couldn't provide more info as I don't know too much about furnace. Could it be the weather being hot so that the furnace is overloaded? However any advice is appreciated.

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  • Can you get us a model number, and a closeup shot of the thing? – ThreePhaseEel Apr 15 '17 at 1:58
  • sure, thank you! Post updated. The image might still be unclear so i wrote down the model# and manufacturer. – J.E.Y Apr 15 '17 at 2:34
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That looks like an condensate pump. They're used to pump the waste condensate water to a drain that's higher than or far away from the furnace's outlet. It collects water in the tank until a float triggers the pump to eject it.

It's not a part of the furnace itself. I'm not sure if it's serviceable but a replacement should be available at local home center for around $50.

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  • Thank you! I'll do an experiment to determine if the pump indeed malfunctioned. – J.E.Y Apr 17 '17 at 14:17

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