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Thank you for the advice, but one more question - if it is the diverter valve as you suggest - before I fork out to replace it, how do I DETERMINE whether or not my diverter valve is working properly or not?

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...