they have the same issue as their zone valves. the clutch gets stuck or slips. in your case, it is when it is exercising the valve which is fairly often. taco says they are working on it, yet all the warranty valves seam to do the same crap. good luck
I've troubleshot this breaker; changed batteries, off/on and it still beeps. Plumber wants to charge $99.00 / call.
they have the same issue as their zone valves. the clutch gets stuck or slips. in your case, it is when it is exercising the valve which is fairly often. taco says they are working on it, yet all the warranty valves seam to do the same crap. good luck
Seams waist fool to start pump hour before use, but we are in USA so not a big deal.