My central heating and hot water system is controlled by a Sangamo 410 timer which no longer works. The faulty timer is the Form 4 version but I have acquired the Form 1 version. Could anyone tell me whether they are interchangeable, or advise what changes are needed to swap them over. Any help would be much appreciated.
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SANGRAMO 410 CENTRAL HEATING TIME SWITCH
- Thread starter kiplyn
- Start date
I think the Sangamo 410 Form 1 has more features than Form 4 and needs extra wiring feeds. If you can't use your 410 form 1, I could use it as mine's just bust and we're freezing! 
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