Circuit Breaker issue?

[RitSim]

Recent trouble with air conditioning unit solenoid chattering (constant buzzing). Voltage at unit is 111 VAC. Solenoid acts correctly when powered with 120 VAC directly. Voltage at panel input is 119 V. Voltage across first main breaker drops to 117 V. Contacts look good and clean. Voltage after individual breaker is 115 V. Do breaker internals go bad?

 

[kappykaplan]

Do breaker internals go bad?

Yes, but I don't know enough to tell you that those are the symptoms you're experiencing.

 

[JoeWhite]

Bypass the circuit breaker temporarily by removing the wires from circuit breaker and connecting them to each other and see if the trouble goes away. If yes, then buy a new circuit breaker and connect wires to it and test the problem. This will answer the question.

 

[RitSim]

I like it. Will try next trip and post results.

 

[Hello Below]

Remembering of course to isolate the AC and always use a volt meter to confirm there is no AC (power) at the breakers before working on the wires.

 

[Stu Jackson]

. Contacts look good and clean

Looks? Did you remove, clean and reinstall? Or just look?