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hi ..hope anyone can help? i have myson apollo 30/50.....which works fine when using it for HW..when i use it for CH..it fires up ok..all rads get hot...but when boiler stops flaring up...pilot goes out....just had new thermocouple and over heating stat fitted.....but still doing it..pump seems...

my boiler works as normal when i heat water up, but when i use it for c/h it fires up ok reaches desired room temp, and stops flaring up as normal..but then pilot goes out.....it only does this on c/h...not water....changed thermocouple....but still doing it...any ideas plz?