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What capacity EV (arrestor) and precharge pressure??

I think a "normal" on/off roomstat will still just switch off the boiler if the roomtemp exceeds the stats setpoint temperature, if you want WC only, just set the roomstat higher so that it will not switch off the boiler. My OT often drops by 5/7C overnight but my roomtemp by less than 2C (with...

Quite, Harry, or is it Quiet?

That 20 minute behaviour certainly doesn't indicate that the elements stayed energised after switching off the shower. The heating can including the two elements contain 0.23L of water (I measured it years ago on a similar 9kW scrapped shower) so this 0.23L will be totally evaporated in less...

Present (mine) mains temp is 12C, a showering temp of 40C (assuming a 9.0kW shower) requires a flowrate of 4.61LPM, if the showering temp reaches 48C (TCO, auto reset trip), then the flowrate must fall to 3.58LPM, if the showering temp reaches 72C (TCO final and no reset trip) the flowrate must...

Try that then, why not.

Yes, I would try that, it won't cost the earth.

Looks like there may be another NRV just before the PG. Just open the outdoor tap and the kitchen tap fully but slowly and note the pressure, it should fall, even if only by a small amount, then shut both taps very slowly and ensure the pressure returns to normal. I would install a 2L EV...

Ensure measurement is between live(s) and earth first and then lives to neutral.

Don't know if your gas? boiler had/has a external circ pump and if it had been renewed with a Grundfos UPS3 at any stage previous to the air problem, the UPS3 is dispatched set to its highest setting of 6.4M, not only that but this very powerful pump will circulate over 18LPM and still almost...

Strangely enough, or maybe not, I had a 9.0kW Mira Sport for ~ 18 years, now replaced with a 9kW Triton T80Z, due to ongoing external waterworks the mains pressure was frequently quite low or non existant for hours each day so I installed a lever valve (with a DCV at the mains), to use the...

The TCO contains two sets of contacts, wired in series, one set of contacts open when/if the water temperature reaches 48C and is self resetting, the other is set to around 72C, if that opens then the TCO must be renewed, (and fault found). the 48C set can be heard operating every time you...

Not sure what you mean by the above, its the air end pressure you are checking and setting so losing the water side pressure is correct and the only proper way to check it, what pressure have you set it to with the water side disconnected?.

Off the mains may work.

I honestly didn't think cleaning the strainer would do the trick, unfortunately.:cry:

Surprising that the strainer blockage wasn't reflected in poor cold and HW flowrates, this reminds me once again of one of the world's greatest mysteries, that unvented HW cylinders don't have pressure gauges.

I would suggest you definitely determine the mains pressure, you should be able to this with that miny arrestor, shut off the mains, open a low down cold tap, disconnect the arrestor pipe, check the air end pressure, if its 3 bar reduce it to 1bar, reconnect the pipe, reopen the mains after...

Very good, didn't read the posts properly, but whatever, if the burner runs for awhile just test for the pump spindle turning or not.

That Selectric is a pretty old pump, just do as suggested above, when system cools down enough to reset the hi level temp trip just get a call for heat and immediately remove the pumps vent screw and stick in a small screwdriver to touch the end of the pump shaft, at least you can determine if...

I read somewhere where someone installed a 5L charged to 2bar with a mains pressure of 5bar which apparently worked.