The unit wont pass water until there is sufficient pressure from the mains cold water supply, check the supply hasnt been altered recently by valves/taps being turned off or down. I have had an instance of the filter being blocked inside the unit, hence a reduced supply. Also l once found a tiny pebble inside the unit blocking the supply. Whatever you check or disassemble, make sure the fuse is out!
steve
November 2004
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