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hi i had a engineer out to day and he said my central heating systems need flushing . i have got some sentinel x300 universal cleanser, witch say to use 1% of system volume i,e 1liter per 100 liter of system water. but how do i no how much is in my system . i have a britony combi se 80 with 7...

hi all, sorry i new to this :oops: . i have a britony combi SE 80 and it making lots of loud noises and then turns it self off and i see a number 80 flashing on the panal, when i look in the manual to see what this is it said "overheat sensor switch open" . so what is this and where is it and...