I have a Nelson sprinkler timer. It hooks onto my water faucet and controls my low-pressure system. It worked great for 4 years but recently stopped. We changed the batteries several times but that's not it. The timer seems to work just fine if we bring it inside and set it on the counter. But when we hook it up to the faucet it doesn't. We're thinking it has something to do with the water pressure? Any ideas on if I can fix it?

If not, can you recommend a good timer? I need it to run 1 cycle per day for about 1.5 hours--automatically coming on and turning off.

Thank you!