Potterton Performa 24 eco he, sluggish dhw spindle

[nutty_jah]

Hi guys,

I have been working on this potterton today, dhw pin was sluggish and diverter was passing through to CH on DHW demand. Changed diaghpram on DHW, and three was diverter block.

Whilst off, also decided to put some chemicals through the plate HEX. Where I found broken bits of flow restricted venturi.

Put it all back together but dhw spindle is still sluggish to extend fully on sink tap. When using bath tap it extends, but then doesn't retract back fully. Dhw at kicthen sink is at nearly same pressure as cold water, obviously due to broken flow restricted cartridge.

But just need to confirm if this full pressure is causing the slow dhw pin? It is £90 for the inlet hydro block. Flow restricted cartridge with venturi is not available seperately.

Thanks for input.

Nuran

 

[Billy Bob Bob]

just change the venturie ,part numbers on that for reference,you will find it much easier to change with a 23 mm spanner,make sure you remove all of the old part as it gets stuck in there,fish it out with a allen key Main Combi 24 24HE & 30HE Hydraulic Venturi Assembly 248051 | eBay

 

[Billy Bob Bob]

one i recently did to give you a idea

 

[nutty_jah]

Fantastic, thanks gas man. That's the part, I found the cross end bit and spring by return port at plate HEX.

Local merchants told me it only came as part of the whole block!

I'm just hoping that changing this will sort out the slow movement of dhw pressure diff valve?

 

[nutty_jah]

Thanks again to gas man for venturi part number.

Dhw diff pin was seized on the rear exit. Which I should have bloomin cleaned and greased when doing the diaphragm.

Thanks all.