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Thanks COG - how can I descale or should I be looking to get worcestet engineer in

Question for weargas - I have a Highflow 3.5 bf with the same symptoms - is it the same solution (where is the thermistor located) - also while the water is heating before cutting out , there is a droning noise ? Thanks in advance

I have an old Worcester Heatslave Highflow boiler (model 41-311-39) - with a few issues. I have had problems with having both central heating and hot water on at the same time, I have now remedied this by changing the 3 port diverter which was faulty, only to find the thermastat on the hw to be...

I have an old Worcester Heatslave Highflow boiler (model 41-311-39) - with a few issues,which after using various plumbers with no success - I have taken it upon myself to learn how it works. I have had problems with having both central heating and hot water on at the same time, I have now...