Poor water pressure upstairs with combi boiler - please help

[BigBurner]

You're right Simon, that was a typo. It's an Ecotec 937 (a monster of a boiler!).

I'll post back details of the flow rate when I get them. Which taps should I measure this at? And what's the easiest way of measuring it?

Thanks

Firstly fit a "full-bore" mains stop tap to reduce a major restriction, and then test the flow rate at the kitchen tap in litres per minute.

If the flow rate is then acceptable, it is then better fitted with a dedicated 22mm pipe from the cold inlet to the mains stop tap, to give the combi priority and reduce water resistance.

Then fit isolators on each appliance: basin, sink, etc, and turn these down to suit balancing the water system. Keep the shower and baths fully open.

 

[simond]

The revised PCB has only just become available. Your earlier PCB change was a shot in the dark.