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  1. M

    Worcester Bosch 30CDi Regular & DT20 Programmer

    Many thanks simond. I contacted the company who supplied the DT20 today and they said the same and apoligised that the salesman gave me bum info, they have refunded me so will get a Honeywell to replace the faultly Horstman. Are you able to say what should have been fitted instead of a...
  2. M

    Worcester Bosch 30CDi Regular & DT20 Programmer

    Hi, I want to add a DT20 programmer to a greenstar 30CDI regular boiler previously contolled by an external Horstman programmer through a 10 contact wiring centre. I can not find on WB literature site any instruction of how the wired 3 port valve, room stat and Tank stat should be wired so as...
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