Guys...to prevent this:
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Try running your power cable like this:
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This results in less binding and crimping of the cord where it enters the machine side plate.
As far as the breaker/thermorelay is concerned, these machines need good clean power to keep the components happy. Bad power = component failure.
The top reasons for breaker failure are:
1- Too light or too long a power cord is used to power machine. We spec a 12 gauge - 50' cord. Once you go beyond 50', it is downhill from there. Try to avoid that...
2- Brushes were not broken in well when machine was first started. New brushes act like super strong velcro on carpet so you must break them in before use on carpet by running machine on wet clean concrete for 3-5 minutes. Just knock the tips off...
3- Power source is weak. Did the lights dim when you started your machine? Situations where the outlet is loaded with household power eaters can starve the machine as well.
While these steps can help avoid tripping the breaker, sometimes it could be the carpet itself that puts up a fight.
Keep in mind - Breakers get weaker as they trip so seek healthy power sources and only use a 50' 12 gauge cord to make your
CRB smile.