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I'll prob ask the sparky to come back to see if he can shed any light....

Back again.... I haven't had chance to trace properly however have rewired the old stat as the missus was moaning that the house was cold and it all works fine.......!!!!

Both ends are a single grey cable with red yellow blue and earth. I can get a meter on it tonight. I don't actually know it's the same cable or not.....

The full story is that I had a qualified sparky fit the honeywell, and clever ol' me thought that it was an easy job to just replace the stat - Im ok on electrical basics and didnt expect a stat to be much different than a socket or switch :shock: I really couldnt tell you any more than what...

its yellow in 4 and red in 3.....do I need to change over the wiring in the stat?

let me check...

PIDs are in the 'self-learning' mode.

I can tell you how they were connected in my old stat (a honeywell T6360B) - Earth to Earth, Blue to 2, Yellow to 3, Nothing in 4, Red to 1. Ive taped/blocked the Blue and Earth.

Too add to this - I can get the 'flame' to come on the room stat but it doesnt seem to be calling for heat correctly as the boiler isnt flaring up....might it be a wiring problem after all?

Hi All Im a first time poster who's looking for some help after scratching my head trying to work out what the hell I've done wrong!! So....Ive installed a new room thermostat - a Siemens Rev100 - and wired it (I believe) correctly - its a 2-wire unit, so red to L and yellow to L1. Ive...