I had the same problem on my 380SE just recently. Per the manual's instructions and based on tips from people here, I pulled the relay and jumpered the pins that turn the pump on. Pump ran fine. Figured next step was to replace the relay. Before I ordered one, I took the cover off the "bad" one. Sure enough, there were three broken solder joints on the large (of the two) relay. 5 minutes with the $10 Radio Shack soldering iron was all it took. Popped it back in and it has run fine ever since. Best of all, it was free.