I continually have to change pressure switches every few months. It works fine for a while and then I'll notice it will stop working and I can smack the top of the switch and it will go back to work again for a few days but then eventually smacking it stops working and I have to replace it only to start all over again. This ia very annoying since I have two water source heat pumps that I have to reset every time the water goes off. HELP! [email protected] I have included email since I mightt not find this site again.