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    Troubles after topping up my Vaillant

    Hi, I have a Vaillant TurboMax 828e. Had it for 6 years no problems so far. Topped it up in the past. No problems with that either. Yesterday, I topped it up to 1.2 bar and following this, DHW is OK but the CH is highly erratic. The CH attempts to start, then displays S.07 'Water pump...
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