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Old 10-21-2017, 02:06 PM   #1
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Automatic Transfer Switch Chatters

My 2016 Sunstar LX automatic transfer switch chatters when I first plug into shore power. It will stop when a load is put on it, like the HW heater, and also stops after some time goes by. I pulled the cover and noticed that the neutral wire (white) going into one of the relays is a little discolored like it got hot at some point. Any ideas on what the problem is?
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Old 10-21-2017, 04:01 PM   #2
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Sorry, I guess this should have been posted in the Electrica|Charging forum. If one of the moderators could move it, I'd appreciate it.
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Old 10-21-2017, 10:01 PM   #3
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Sounds like one of the relays got cooked and needs attention. If you still have warranty left have the dealer take care of it before the warranty runs out.
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Old 10-22-2017, 04:25 AM   #4
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Try connecting to the post after turning off electric HW heater, A/C and electric heat (if any). We've seen this 'chattering' when a generator is started up on a coach not plugged in to shore power when major AC power circuits are on.

Likely causes can be sensitivity of transfer switch and power management system. Do continue to check for toasted wires / connections.
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Old 10-27-2017, 12:11 PM   #5
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Update - I think I found the source of the problem, the ultrasonic mouse repellers! I was still getting some chattering from the switch, until I unplugged the four ultrasonic mouse repellers and the chattering stopped. I assume they were putting something on the AC line in the coach that the circuitry in the switch didn't like. So those things are going into the electronic recycling bin.
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Old 10-27-2017, 08:55 PM   #6
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Does that one have an inverter built into it or a solid state controller?
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Old 10-29-2017, 09:31 AM   #7
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Solid state controller. Inverter is a separate box.
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