Hi, and thanks for reading my message:
We have an electric forced air furance on a 125A breaker. Our panel is 220A. I notice when the furance first comes on, and also randomly when it is running, its beaker in the panel "humms". If I press against it, the humming stops. It does not feel hot, and the panel doesn't seem hot. The breaker is probably almost 18 years old, and we have just recently noticed this sound. The furance works 100% normally. Any ideas why the breaker is humming? As well, which I consider normal, when the furnance first comes on - the house lights dimm for 1s. This is normal - I assume? Thank you.
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