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that system is in a bad way did you put the wax valve in hot water

i did one of these today the first thing to try is turn of the water going inot the boiler (cold mains) then try the heating again, the reason for this is if you have a leaking tap it will cool down the wax valve giving you no heating. did you try the wax valve in water did it move if not its...

its your diverter valve. you get hot water thats ok you turn the CH on it stays on for 20-30 seconds then goes out, this isnt down to a fault the boiler is getting to temprature due to no curculation but if you leave it on for a long time your rads will get hot