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  1. C

    Thermostat replacement

    can you offer any guidance as to meaning of A B and C or is it random nomenclature ?
  2. C

    Thermostat replacement

    Am trying to replace my room stat but not sure of wiring - need some help. New stat is honeywell T6620 - not sure what old type is - honeywell of some kind, original has 3 wires - an earth and two additional wires, red and blue. New stat has 3 terminals marked A B and C. Any ideas how to connect ?
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