the noise is a result from too high of water pressure and that can be caused from a bad pressure switch not shutting of when its supposed to 60 psi max . They are cheep , around 20 - 30 bucks it is best to just replace it , because when electronics go bad they can act funny or just stop working all together. Make sure you turn the breaker off at the breaker panel first , this should be a double breaker wired together , most often 2 - 15 amps breakers wired together or 2- 20 amp breakers wired together , make sure you look at what wires go where so when you install the new switch it is easy and trouble free. This is very easy to do , but MKAE SURE you turn the POWER off first!.
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