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  1. C

    CH not switching on until HW switch activated? Fixed...

    I originally posted this on Dec. 2nd last year: I had a new Grundfos UPS2 15 50/60 pump fitted in April this year by a local heating engineer as the other one seized and blew fuses. Two weeks ago we switched CH on (through wall timer programmer in airing cupboard) which controls water and...
  2. C

    CH not switching on until HW switch activated?

    I had a new Grundfos UPS2 15 50/60 pump fitted in April this year by a local heating engineer as the other one seized and blew fuses. Two weeks ago we switched CH on (through wall timer programmer in airing cupboard) which controls water and central heating. The Grundfos fails to switch on...
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