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problem there is BG maintenance contract excludes drain and flush tha't chargeable at exhorbitant cost. they quoted us £800, and even worse, it was not the problem. some pipework was wrongly fitted (by them).If they take the valve off and replace it them it would be worthwhile to fit isolator valves to save draining down the system when it fails on 30 years time. A drain down and flush could be on the cards to get rid of any crap in the system, the whole lot may have acquired a chunk of magnetite stopping the valve from operating fully. Does the valve operate fully?
I could be talking out of my arse but would induced currents have an effect on the new programmer?