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O.k I am not a tech but I play one on the internet. The reason that both pumps would trip the breaker is because on this spa both pumps are on the same circuit on the board when pump one is engaged on high. When pump one is turned high a short from pump 2 is detected and caused the breaker to trip. This of course would also occur when he tries to engage pump 2.
What I don't know is whether you had someone sit at your computer to type that or whether the response was e-mailed for you to simply copy/paste?
Try cleaning your filter. You may have a dirty filter that is causing an issue with the heater which could cause the breaker to trip.One easy way to find out if that is the problem is just take out the filter and see if the breaker still trips. If it does, call your dealer for warranty service. If the breaker does not trip, then you have found the problem. Clean the filter and you'll be good to go.
Not to under mind your theory but, a dirty would typically cause a lack of flow to a pressure or flow switch depending on the brand of spa and it would disengage the heater (to protect it from self destruction) and show a flow error on the topside, in this mode the spa would not heat.It is not probable that a dirty filter would cause a trip of the breaker.