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Loud snap when furnace turns on and off

TronTron Posts: 2Member
I've got a 10 year old Rheem gas furnace. I just had an HVAC tech out to do the regular cleaning and maintenance and he gave it a good bill of health.

2 weeks later I turn it on for the first time and every time it turns on or off, there is one loud snap. I can even hear it on the first floor of my home. I assumed it was the igniter, but it happens when the heating element turns off too....and I can't figure out what would cause it as it shuts off. It's not a bang. More of a sparking snap sound. And it never happens more than once per start or stop.

Any suggestions? Ill admit I'm not much of a do it yourself guy, but I like to be somewhat educated when dealing with contractors...
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