Noise when furnace kicks on?
We have a gas furnace and im not sure how else to explain this... When it goes to kick on i hear this loud noise. Sort of sounds like a metal detector would over a certain type of metal. Or maybe robotic or alien like if you ask the children here lol. It lasts for maybe 4 to 5 seconds as its kicking on then stops. Everything else sounds normal. Its working. But i don't know anything about them. I've always had electric heat. Could it be the gas line? I dont smell a leak. Please help.
- elhighLv 78 months ago
That sounds like a spark ignition system.
Some furnaces ignite with a glowing hot heat element, others with a pilot flame (uncommon in modern applications) and some with a spark ignitor. The high voltage spark sometimes makes a noise you can hear.
- JohnLv 68 months ago
Fire Box heating up makes spooky noises.
- martinLv 78 months ago
Something in there is maybe loose, misfit, or rattling. Don't mess with it yourself. Get someone with experience.
- MarkLv 78 months ago
No, the metal ducts (and furnace) are expanding with the heat.
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- Anonymous8 months ago
good to know i guess