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Mend Switchmaster Replace 500 Model

Can I replace my Switchmaster 500 timer with a newer model?

The clock on my ageing Drayton Switchmaster 500 heating and water timer has died. Can I directly replace it with a 400 or 600 or 805 model without a major rewring job?

Peter Webb
February 2009
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Mend Heating, Home Heating Systems
Click here to mend Switchmaster home heating systems