I have further imfo ' apparently these flue stats were fitted as part of an ideal recall , due to heat exc' problems , the models effected were the response 80 , 100 , 120 , & ff80 , henrad cc80ff , cc100ff,& cc120ff , the fault was heat exc ' baffle . the stat is non resettable , & Ideal state that in the event of a failure , they should be contacted ?? , I am not certain but my imfo suggests that ideal , had to agree to this policy , due to the involvement of trading standards ??? . who ever dreamt up this particular design of boiler , should in my view be shot !!