Potterton Promax

[Cadiz]

Hi guys,
Got a call from a young female asking to investigate an E119 fault on her boiler (lack of pressure) thought I'd call in on the way home to do the necessary re-pressurise and find the boiler will not reset no matter how long you hold the dial. Seems like the pressure switch can't see the presssure in the system Any useful suggestions welcomed.

 

[nickso]

removing the wires from the WPS and reattaching them sometimes works. the wps on these are ****e.

 

[bellairaphon]

sometimes they become blocked up too need brodolling out. same ****e as the pumu

Nath

 

[gigz]

Make sure the hall sensor is clipped fully home (red light on)

 

[rojaca]

If Press switch is on hydraulic outlet assy worthwhile trying to clear the waterway out on the brass body with a bit of wire etc whilst you've got the switch off.

 

[Cadiz]

Thanks Guys I havent been able to get back at it yet but will go armed with a new pressure switch just in case

 

[nickso]

Make sure the hall sensor is clipped fully home (red light on)

why does that help? red light only comes on when dhw is drawn.

 

[gigz]

Make sure the hall sensor is clipped fully home (red light on)

why does that help? red light only comes on when dhw is drawn.

Yes and if red light doesn't come on you know its not clipped fully home