No, we need to figure out the culprit, the pump is the least likely culprit. You mentioned cleaning out the reactor, in doing so were any hoses shortened or rerouted or pinched, anything that could alter the head pressure on the pump. The PTC is a safety the prevents the pump from drawing more current than can be supplied and breaks the contact in such an event. A short hose run is the main culprit, it is designed around a typical install with about 4ft of head pressure. It is actually more likely to have a PTC that is faulty than a faulty pump, it is also possible the pump is jammed maybe with some lime or sediment that came out of the kalk reactor.