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    Any Valliant experts out there? TurboMax 824

    Hi Is it sludge, a dodgy DV or scale maybe - any help appreciated Model - TurboMax 824E Every morning F22 error = no water in system Reset and run HW , yellow light ON and temp then shoots up to 115 and back down to 60 with equivalent popping, hissing, banging and yellow light goes off...
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