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Ta very much, most helpful.

Hi, does anybody know what the fault code F4 means? Thanks

Good point, well made. I think its down to a blocked thermostat by pass but wanted confirmation.

I'm studying for my ccn1 and need help with a question. Theres no-one else I can ask at the moment and its driving me mad. What is the likely fault if a cooker oven burner extinguished after approx 15 minutes? a/ faulty FSD b/ blocked oven injectors c/ blocked oven thermostat by pass d/...

Problem sorted itself over night. Thanks once again for the input.

Will update you tomorrow. Thanks v. much for the tips.

I think its when the flow and return are on opposite sides of the cylinder. Have fitted a cylinder with f&r on the same side, apart from the possibility of my pipework being iffy, would this have any effect? Thanks.

House is 2 storey, boiler downstairs in kitchen, cylinder on first floor, f&e in loft. So don't think cylinder is at a high point. System is pumped. Will try loosening the unions first. Original cylinder was 'opposite coil' and for a direct replacement I would have had to wait up to a week...

Is it just a matter of cutting in a tee with a vent on the flow? Pipework is 28mm and theres not a lot of room. Thanks again.

Will give it a go, but I did back fill the system (via the drain off- I was under the impression this would eliminate airlocks?) Thanks

Have just installed a new cylinder but, after refilling,have found that the hot water doesn't get hot. Central heating works ok. When hot water is switched on, boiler fires for a few minutes then shuts down. There is no cylinder stat and I can't find any motorised valves :roll: Any ideas...