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Hi, I currently live in a Victorian semi-detached property in Oxfordshire, constructed in 1929. We are considering removal of the existing chimney breat to free up more spece in both downstairs and upstairs front rooms however, the arrangement has got me a bit stumped and would be grateful...

Thanks to all for assistance. Had issue with similar error codes re:frozen condensate pipe last year, however had checked condensate outlet which was drippig freely, i.e. ok. 2 weeks now and no overheating so TRV valve is coming off in hallway. Many thanks again to all. Scott

Hi Simon, Opened up TRV valve fully in hallway/stairway where house thermostat is (re-setting it to 20oC from original 30oC where TRV controlled temperature) as an interim measure and run the system. After now running for several hours , temperature on boiler for all options i.e. CH, HW...

Thanks again Simon, However, surprised TRV's coud be the cause as lock-outs have only occurred since HW cylinder was replaced in last month. No issues previously in 3 years of operations. Also as all rads are operational, would it be fair to assume the pump is working (circulating heat)...

Thanks Simon, Yes TRV's on each radiator. Pump was replaced at same time as boiler, i.e. 3 years ago. Regards, Scott

Hi Simon, Thanks for response. Only 1 motoised valve visible in airing cupboard. System overheats/goes to fsult code after 20mins or so and intermittent in all formats, i.e. CH, HW & CH+HW. Works were restricted to direct like-for-like replacement of HW cylinder including new surface...

Hi there, Limited DIY'er however would appreciate constructive advice. Recently had hot water cylinder replaced due to leaking indirect connection, after a week or so, instead of boiler (open vented system) stopping at 82oC when fired up, temperature would rise to 99oC....and occasionally...