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  1. J

    Saunier Duval - Thelia 623 (pump replacement)

    The problem is I have water seeping from the pump on my Thelia 623 boiler in two places. Firstly, from the front where there is a brass serrated cap (to front of pump just behind boiler casing when opened) and the second leak to a pipe on the left which connects the pump to a jubilee clip and...
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