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thanks - however I have dealt witrh the guy for over 25 years and jhe's first class. Present suggestion is loose scale inthe pipework interwefring with valves

very frustrated. HW + CH fault. using honeywell motorised valves and room thermostat. Programmer and boiler all of which are tested and working perfectly individually but not coordinating. experienced qualified plumber and CH installer unable to locate problem and any suggestions very welcome...