As an electrical engineer I am qualified to help you but the best help should come from the manufacturer of the pump. If the installers can't help then a call to the manufacturer should be in order. Many manufacturers (not all) have manufacturer's representatives, some of them local, that fix problems like you are describing.
Several items that I would check are: temperature of the motor when it cuts out. Most motors will cut out on thermal. Why it is over-thermal is a long list of issues. The start capacitors may be an issue but this is difficult to test. The wiring was changed? Why? if it is in fact a two stage motor then it may be trying to go into high or low speed and there is no winding feedback for the controls: hence, "self check error" ?? Good luck, and please get the manufacturer involved, they would rather fix this than their motor get a bad reputation.

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