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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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    Fitzy71:

    I’m not sure if it’s S or Y plan to be honest.  It’s a combination boiler with the big expansion cylinder above the hot water tank. 


    Are you sure it is a combi? Sounds like you have an un-vented cylinder for the hot water. Anyway, which model is your existing honeywell room thermostat? We should be able to find the wiring diagram for it somewhere


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  • 0
    Fitzy71:

    I’m not sure if it’s S or Y plan to be honest.  It’s a combination boiler with the big expansion cylinder above the hot water tank. 


    Are you sure it is a combi? Sounds like you have an un-vented cylinder for the hot water. Anyway, which model is your existing honeywell room thermostat? We should be able to find the wiring diagram for it somewhere


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