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OK, I probably should have been more concise in my query. Seems like topic of discussion has become 'is £89 a lot of money' rather than 'could f5 f6 faults be down to sludge?' I have paid £50 to get the supposedly professional diagnosis that these faults 'could' be down to sludge in the...

Boiler was serviced and new seal replaced last summer so hope it'll be OK

Thanks Tony. I couldn't find x800 at the local shop so just went for x400 coz I just wanted to get it done on my day off. So do you think i ought to try the cleaning again and it's not something else? I assume you know all about the f5 being the overheating fault and f6 being the flow thermistor...

Hi I have had plenty of information from reading the other topics and am hoping your generosity will help me out on this one. This is our 2nd winter in this house and the approximately 10yr old British gas 330 (glow worm) started developing faults. It started with a f5 fault on heating...