We too run solenoids on our downstairs hot and cold water supplies as they are below the sewer line so waste has to be pumped, if the pump fails or throws an error the water instantly shuts off with the solenoids so we cannot flood out.
About a year ago we noticed very low hot water flow and it turned out to be the solenoid. The plumber took a while to find the part and it eventually went from light clicking to making one hell of a racket (I think it was continuously trying to open and close).
Simply anecdotal but it might be that you have something similar going on.
Yes there is a downstairs sewer pit and pump. I suspect the solenoids are triggered to stop flooding if the sewer waste unit isn't triggered to empty the enclosed sewer pit unit. This occurred once as the sewer pit didn't empty and flooded back to the bathroom. The sewer pit float sensor to do that was stuck AND the overflow alarm didn't trigger either. Both fixed and retested.
@K1w1k1d I assume the issue could simply be the valve is struck partially open with grim, lime etc so and if so can be cleared?. That would seem more likely than the solenoid itself failing with the valve partially open?
FYI the unit is a NC (not closed) solenoid so its odd is partially closed?
FYI Zip quoted $225 for a same spec replacement then I'd need to get a plumber or fit myself
@concordnz you have a point in regards to simply not having a solenoid as it appears to be only managing a situation of the sewer pit not emptying AND water left running?
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