Thank you for info. The wiring all appears OK. The control box was faulty and company wanted to charge a fortune to replace. An electronic company repaired it and as soon as we refitted we have the same issue. Any thoughts? Not sure whether the unit has gone again, but if it has must be something causing it to go?
An engineer did say that they had had problems with some of the control units a little while back where they were faulty!
Many thanks
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