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Mend Switchmaster SM905 Wiring Central Water

wiring on a SM905 switchmaster timer?

Could someone explain the wiring on the timer. The central heating is working fine, but when we just need the water on it does not work. I think it has been wired up incorrectly

Sue
April 2009
SwitchmasterSwitchmaster SM905Heating, Home Heating SystemsWiring Central Water

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SM905 Switchmaster Wiring - Help & Advice