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Many thanks, I THINK it's sorted; somebody suggested gently massaging the non-return valve or joker valve t see if I could dislodge whatever was blocking it.
I prodded about gently with an old toothbrush and followed this with several panfulls of warm water the flush/empty improved and sems OK now.
Original symptoms? noisy motor on "empty", pan too full to "flush" and a swirling mass of liquid.
