Definitely not a wiring issue as ours has also been in for 4 years. have
you tried deleting all scheduled water times & resetting them, switching
water off then on again in the app ? That’s pretty much all I did.
Mine just started working again on its own. The only thing I did was
switch the water off & on again in the app but I don’t think that fixed
it as it was a day later that it started working 路♀️