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Old 12-24-2019, 01:55 PM   #1
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Transfer box buzzing loudly

I noticed today the transfer box buzzing rather loudly today on my National Dolphin 5355. Is this a sign of a looming problem I have never noticed noise from it before ? So far electric seems normal I am not running anything yet in the motorhome. I am just plugged into a 20 amp in the garage. I noticed a loud click to the surge protector yesterday when a car battery charger I was plugging in had a short in the cord. Could this have damaged something? No breaker blew. Not sure if this outlet was on the same line in the garage.
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Old 12-24-2019, 02:22 PM   #2
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You probably didn't damage it, but the buzzing is one of the contactors or relays. Mine buzzed for about a year before it finally quit on us and would not transfer to shore power. The new one is pretty quiet.

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Old 12-24-2019, 02:34 PM   #3
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I had to replace ours last month. I was surprised that the new one had a informational paper on which was essentially this statement "this device may make noises and those noises don't mean anything is wrong."
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Old 12-24-2019, 02:57 PM   #4
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Disconnect all power, blow out with compressed air, spray with contact cleaner let dry then give it a try. You may need to clean the contacts with ultra fine sand paper.
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Old 12-24-2019, 04:01 PM   #5
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I flipped the 50 amp main sw on and off rapidly, maybe 10 times. Quit buzzing, that was maybe 4 years ago. What can I say!!!
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Old 12-24-2019, 04:22 PM   #6
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Mine was buzzing too this summer. I tightened all the electrical connections in it and the sound went away.
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Old 12-24-2019, 05:52 PM   #7
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I just read an article about buzzing transfer switches yesterday. It said cleaning was usually the best fix.
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Old 12-24-2019, 07:42 PM   #8
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Yes on all of the above re cleaning. Mine is quiet but every now and then it will start to buzz loud enough to hear from the outside. I just open the compartment and smack it with my hand, buzzing stops and I wont hear it for a few more months.
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Old 12-26-2019, 06:14 AM   #9
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I shut all power down after reading your suggestions waited a few then fired generator. I couldn’t hear buzzing with the generator going if it’s possible with noise of gen. After a few minutes I switched back to shore power much quieter. I will do a cleaning of contacts though to prevent any further problems. Thank you for the information. This came at a time pressured time as we are leaving for Florida in the morning. Merry Christmas and Happy New Year to all !
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