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    Vaillant Ecomax Pro or Myson MPE222 problem?

    I've recently noticed a problem with my CH. The sytem is as follows: 1. Owl Intuition control system. 2. Two Myson MPE222 zone valves, one for CH and one for HW 3. Grunfoss pump. 4. Vaillant Ecomax Pro boiler. The boiler, pump and zone valves are all about 10 or 11 years old. The Owl...
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