I have an Intellifaucet D250 that has suffered from sticking valves (I'm in a hard water area - but all my darkroom water goes through a filter) recently - last weekend I soaked the hot and cold inlet lines with 6% acetic acid for 48 hours and when re-plumbed on Monday evening the machine worked perfectly. However today the valves have started sticking again.
I'm going to investigate further but has anyone else experienced this? - noting that when soaked in the vinegar the valves where in the closed position and perhaps I need to manually manipulate them somehow to dislodge some crud. As I'm in England I'd like to get the unit working again without posting off to the USA for servicing.
Tom
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