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yes, pic is attached

thanks, and I can use a standard electrical cable to connect the RT ?

the green light on the display? No, its not on. on a separate note, i want to install a room thermostat, i have the RT but Ive noticed on the boiler that i need to connect the cables to 3,4,5 on the system board but 3 & 4 are connected to each other. any idea why this would be and if i can...

morning all i have a valliant turbomax 828 boiler which is about 6 years old. ive noticed in the last few weeks that every now and then the boiler sounds like its trying to switch between settings. the display will keep switching between s.31 & s.02 for up to 5 mins even if the heating is off...