Recent content by Johntheo5

The blue one looks like it should be the HW motorized valve and the honeywell red circled one, the heating motorized valve, are there any other motorized valves in the system?

Its a strange one allright, one of my showers has gravity hot HW and mains fed cold from two > 50 year old taps, I just open the gravity (0.25bar) fed hot fully and then just crack open the mains (2.5bar) fed cold to give the required showering temperature, seems to work fine even though the...

This one ??.

This might be of interest to someone with the same pump, these numbers are from a system with 12 rads.

I see some models have pump overrun, does this one?. if so can the pump circulate water through the rads or a rad to remove the excess heat or is there a ABV installed?.

Just looking at the flow swings from a thermal point of view, if you were having a substantial shower of say 11.69LPM using 8.0PM at 50C + 3.69LPM at 12C cold to give a showering temp of 38C then the cold flow will have to fall to 2.48LPM to increase the showering temperature to 41C (easily...

Jusr set the combi HW temperature to say 35 to 40C, whatever showering temp you use, use no cold and see does it remain steady as a temporary measure.

What is the make/model of the boiler?

Yes, confirmed on all counts, a 45W pump. However, unfortunately this only corresponds to a flowrate of 0.2m3/hr, 3.3LPM which seems unlelievably low for what?, 6 or 7 rads, however, the proof of the pudding is that all the rads are hot, I would expect a very big dT of at least 20/25C. It...

The pump will circulate 87% of the flowrate in CP2 mode (4.5M) vs CSIII (6.0M), The main reason for changing to CP2 is to determine for sure whether you have a 35W or a 45W pump, if it is a 45W pump then the circulation rate is only ~ 2.0LPM at 36W, if its a 35W pump then the circulation rate is...

OK thanks, you can cool down now, if the watts didn't fall below 26/30W for a few seconds before you re opened the outlet valve then its possibly a 45W pump, (it should have fallen to 20W if a 35W pump) and the circ flow is very low at ~ 2.5/3.0LPM, just about enough for 3 rads or so, can you...

Can you do that pump test and we can figure out then hopefully what the exact circulation flowrate is.

Forgot to ask you to measure these flowrates with/through the showerhead, maybe you did, as that will further reduce the flowrates but significient only with the restricted flowrates. Most combis have a minimum flowswitch set to 2 to 2.5LPM, if the HW flow is less than this then the burner will...

Just looking back through these posts again. Are you saying that it refuses to relight even with the cover off or have you tried running it with this cover removed temporarily?. Does the new control box not include a photo cell and if not, they should be easily available, I think there are two...

If you measure the flowrates with mixer to fully cold and then to fully hot, are, or do they seem similar?