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Wiring up new room thermostat

Former Community Member
Former Community Member
Hi guys


Hope you’re all keeping well and safe?


I need some help with wire colour identification for my new Flomasta and 6259G wired thermostat.  I have worked on any heating/water installs yet, so I’m not familiar with the wiring colours.  My old analogue Honeywell thermostat has 5 wires, Gn/Y, blue, black, light grey and brown.  The Honeywell is wired 1 gn/y, 2 blue, 3 black, 5 brown, light grey isn’t used.  New flomasta uses only 3 wires, Com, NO & NC, I know the NO & NC means open/closed, but which colour wire goes to which terminal?
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    Fitzy, if you have moved into a new flat and there is an unvented heating system, which I believe that you have, it MUST be serviced regularly. The "water tank" is an expansion pressure vessel. There are system safety devices that need regular testing for correct safe operation. Please make sure that this is done.


    Z.
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  • 0
    Fitzy, if you have moved into a new flat and there is an unvented heating system, which I believe that you have, it MUST be serviced regularly. The "water tank" is an expansion pressure vessel. There are system safety devices that need regular testing for correct safe operation. Please make sure that this is done.


    Z.
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