thanks for the reply
since i posted the question i have tried several things
i turned the thermostat off before i lit the burner and it still reached a temperature that was uncomfortable to touch when the boiler was on.
i have also shielded the thermostat from the lounge door - it...
a weird one. any help greatly appreciated.
lounge radiator with thrmostatic valve, logburner in same room and i can't turn the rad valve off/control it when the burner lit. the rad ends up very hot. I have swapped the the valve for another and still no luck, it works ok when burner is not...