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Going to have to come back to this in a bit as have a flood (excuse the pun) of other lifey things need sorting, but wanted to thank @everyone for their replies and advice so far - it is really appreciated.

Thanks @MeldrewsMate - no towel rad in the circuit, just the Bathroom Rad first in line which gets piping hot with both CH and HW demand irrespective of other results/rads. Should I try closing this Rad once pump running as a test? Does the water pipe (cold feed) from the loft mounted F&E tank...

I only have one energy monitor and if i tried sticking a 3 pin plug in her this would be my final post...

CH & HW Demand Test HW Cylinder set to 70 degrees (was 60 prev.) HW & CH turned ON at controls. - Diverter Valve moves to M. - At 22 mins boiler Burner still ON. - Run HW tap: water is warm/hot but not scolding hot. - Rads behaving as per prev. tests i.e. some tepid, some hotter, - Entrance...

@Johntheo5 - Pump replaced approx 1 year ago because (very) old Grundfos pump spindle was getting jammed frequently. - CH was fairly lacklustre prior to pump change but did essentially operate and boiler/burner remained on; after new pump install CH never on long enough to properly gauge...

@Johntheo5 - thanks for staying with this and apologies for belated response - have been away for a few days. Vent Pipe Tests Pre-testing: Vent pipe that runs over cold water tank is dry as a bone, inside pipe and externally, indicating that no water has passed through recently. - CH ON - No...

CH Test All Rads open Pump on speed 2 Boiler Thermostat set approx halfway Room stat at approx 25 degrees 8:45am - CH ON - Boiler Burner Indicator Light ON 9:06 - Burner Light OFF - Pump still operating but noisy/bubbly 9:19 - Burner Light ON 9:29 - Burner Light OFF 9:37 - Burner Light ON...

Thanks @Johntheo5 - as @MickyP10 says this was a good spot. For various reasons we won't get into I have a deep seated, some may even say conspiratorially cynical, aversion and attitude to anything labelled or promoted as 'Eco' - so I can definitively confirm I've never used this setting and...

@gas112 - It does, however so far I've been killing the CH v shortly after the Boiler Burner Indicator goes out because: a) I was concerned about causing damage b) I don't know what I'm doing c) wife told me to even though she also doesn't know what she's doing As mentioned, I'll try keeping...

Thanks @Johntheo5 Pump is Archergas - please see attached ( Running on II (Two) Speed. Going to try the continuous 2 hour CH run later this evening and report back.

@numpty1 Thanks - that's definitely something I can try (I'll stick a Columbo film on whilst I wait). A couple of dumb follow-up queries (sorry): - Do you mean the stat/dial on the Boiler? - The Worcester Bosch manual states the temp range is approx 35 - 82 Degrees C but the dial isn't...

Thanks v much for replies: @Hugh Jaleak - When system was drained the water was fairly clear, and certainly not discoloured/odd enough for us to take note @Johntheo5 - Boiler doesn’t exactly reset: - Burner Indicator (Green light) comes ON when CH turned on - After approx 15 mins, Burner...

Hi all, Firstly apologies if this is something already covered; I did search the forum prior but couldn't find anything specific that replicates the issues I'm having. System: Gravity Fed, cold header tank in loft. Boiler: Worcester Bosh Greenstar 15Ri Pump: Archergas 15-60/130 – fitted...