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Well I've just rewired the old thermostat to test and the grey is certaily needed on terminal 1 for the boiler to fire so I can confirm that it is the switched live. I've now rewired the new thermostat and its still not working so I am definitely out of ideas - I have reset the unit...

So just to clarify: on the new 6501 the 3 terminals that are listed NO = terminal 1 = switched live COM = terminal 2 = live NC - terminal 3 = **empty** And to test by wiring together if this configuration isn't workig - this is just into the same terminal in a conblock to ensure the...

That diagram is hinged on the corner of the 2259 and corresponds with how I posted it was wired before I removed it. On new one, I have wired the red wire which was on terminal 3 on the 2259 to the COM terminal, and the grey wire which appeared to be either loose, made good, or was on terminal...

Hope this helps?

Thanks for the replies everyone Well I have wired it as suggested with the red to com and the grey to NO and it does not appear to be switching the heating on - as in set the temp to 25deg and its not firing up the boiler I took pictures of the old thermostat before I disconnected it...

Hi Need some help with the wiring on a new Sunvic TLX 6501 The 2259 is wired as follows Red wire to terminal 3 Black wire to terminal 4 Grey wire had been made safe by the look of it but not sure as it could of been on terminal 1 at some point? Green wire to back plate terminal...