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Take all the readings, same as in post #101, please.

I don't know how (or if) the calculation for residual head is done to give the proper pump speed/output but quite easy to calculate the pump head from a known speed. For example if the pump speed is 46.3% then the pump head (at the pump) is 700×0.463^2, 150mb and the residual head will be a...

When you start the boiler normally then you should see the pressure gauge rise by around o.2/0.3bar, if it does, then possibly a faulty "pressure sensor" or a failing pump. When it's firing for say 15 minutes or so note the flow and return temperatures D40& D41 in the boiler menu.

Big improvement with new HEX but again, same as other WB with a new HEX, a 3C dT between Target/Flow temps. Burner cuts out at Targettemp+5C so a worry that this may happen if you switched off a CH zone as the boiler now has only 2C to play with, under steady state conditions, the target/flow...

Yes, but the dowstream pressure o ly has to fall by a tiny amount, maybe 0.1bar for it to start lifting. Have you installed a new one?? G

MI = Manufacturers Instructions. Can't understand d why the don't use the previously used real flow sensor and a additional HEX sensor which doesn' play any part in the flowtemp control but will flag a alarm/trip if it does exceed a certain temperature.

The drop tight has a soft "rubbery" seat. Caleffi give a very good description/picture of how PRVs work.0

Thanks Tony Won't go through my dreary calcs just now but you may have a very high either HEX or system resistance. You appear to have a calculated flowrate of 6.75LPM at 1.82M system head ((assuming a clean HEX) which equals only 8.7LPM at a 3M head, my system which is fairly typical of a lot...

Terminal 10 should supply SL (switched live) on the boiler and PL (pump live) on the boiler should supply the pump, when term10/ SL has 230v then PL (pump live) also has 230V from the boiler's L (permanent live) and the PCB, when the programmer is switched off or all the zone valves close there...

Have you got zone (motorized ) valves, if so, then, assuming CH only on, if the timer is on and calling, then it supplies 230V to the roomstat, if the roomstat is also calling, it opens the zone valve and a auxiliary (end) switch closes which then supplies 230V to the boiler, the boiler then...

They don't build them like they used to, I changed a circ pump on a 20 kW SE Firebird for a neighbour about 6 years ago and found that the circulation was the wrong way round and had been for about 9 years, he had found that he had to keep the boiler stat dial setting well down to keep a...

Was able to send it as a zipped file, so just open it up

Unfortunately I cannot post a excel file on here but anyone interested can build their own spreadsheet from the screenshot, then just change the values in yellow to suit their own requirements.

The Baxi has its return R on the top left, outer, with the Flow F immediately to its right. The logic is somewhat similar but the Return is on the Top, extreme Left and the Flow on the Top, extreme Right?.

Can't obviously speak for @Madrab but IMO the EV diaphragm should never bottom out, this is why a precharge pressure 0.2bar less than the PRV (pressure reducing valve) set pressure, usually, 3.0bar, is recommended, some say it also helps to prevent water hammer as the EV acts like a spring to...

A stainless steel UV cylinder with its pressure reducing valve set to 3.0bar (with a recommended precharge of 2.8bar) and a EV sized to 10% of the UV cylinder's capacity will have a final pressure of just over 4.0bar if fully heated from 5C to 65C, its expansion relief valve might be typically...

Try putting the shower to fully cold and on full. See does that improve the other two.

Yes, but does it feel like 60C just leaving the boiler, does the boiler display the DHW temperature, I'm thinking that there might be some X over from a cold supply somewhere because if its leaving the boiler at 60C or so and its only lukewarm in the kitchen/shower then there must be some cold...

Does the HW pipe at the Boiler only feel as warm as the temperature in the kitchen and at the shower,, what is the temperature set to?

A photo of the Immersion top with its cover removed would be invaluable.