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Hi guys anyone know much about grant boilers .got a boiler combi 26 e .constant hot water demand flow swicth is always live .there fore no heating .replaced two flow switch two months ago.does anyone know how to overdride hot water demand .so i can test heating .????
 
Remove the flow switch and check there is no debris in the pipe. These can cause problems. When you take it out just push the paddle back and the heating should kick in if the bank is up to temp!
Or get an oily in!!!!!
 
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