Hi everyone! I have a Lasko electric heater making a buzzing sound. I pulled it apart last weekend and found one of the relays buzzing. There are two heat settings on the heater. On the low setting the buzz is quiet but pretty loud on the high setting. I do not own an oscilloscope so I can't see the waveform going into the relay to see if I have a pulsating signal going into the coil so figured I'd ask the experts on this forum to see if it would be better to just replace the relay and hope that fixes it or if I should check anything else first. Also any ideas on where to buy just one? I checked Amazon and can only buy half a dozen or so at a time. Relay JQC-3FF 12VDC-1HS(551)

 

Looks like quite a few sources out there, Ali-Express has them for < 1.00.
When you replace them, open the vent pip or recess, seen in the corner of the top, this reduces or eliminates contact arcing, due to ionization of the interior of the relay.
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The relays cost about 50¢ each, you're mostly paying for shipping.
Here's a 2-piece minimum but shipping will hurt a bit in price and time.
https://www.lcsc.com/product-detail...Electroacoustic-JQC-3FF-12-1HS-551_C3640.html

 

That was quick! Thanks everyone.