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Horstmann channel plus. The water is on all the time?

Even though the program shows three distinct periods throughout the day, the light stays on permanently and the boiler periodically fires up.
Derek, December 2016
The programmer plugs onto a backplate,just loosen the 2 screws underneath and then hinge the programmer forward at the bottom then off the 2 tabs at the top if the boiler ceases to work a new programmer is required

toptrish, December 2016
link Click here to see other fixes for Horstmann.