central heating switch

  1. C

    Modifying heating switch

    I have an installation with Sunvic TLX RFP but one of the receivers (2 zone system) has failed. The Rx has 3 connections, L,N and output which goes to a zone valve (and via that to boiler). I may have bought the wrong replacement. It's receiver has 5 connections as you can see from diagram...
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