I just started opening the pool for the season. Everything was working fine when I closed in the fall. The equipment is fairly well protected in a small pump house, so I leave the pump out over the winter. All the equipment was installed well before I bought the house. I believe everything is between 12 and 15 years old.
The breaker trips instantly (less than 1 second) after power is applied. If the pump is unplugged, the breaker does not trip. So, the wiring and timer are fine. The pump impeller turns freely.
Does this sound like a short in the motor? In your opinion, is it worth replacing the motor or does it make sense to just get a new (and maybe more efficient) pump? The filter seems fine, but the multiport valve is binding a bit and it does leak a few drops (literally) a day.