potterton puma boiler - intermittent pumping

[scrabble]

Good Day Gentlemen - new member here!
9 yr old system
initially low system pressure light - reset this thx to previous advice.
However, light extinguished now but boiler and pump fire up intermittently.
no visible movement of contacts inside the switches when I flick the boiler switch or pump switch. However they do move when the system decides it wants to do it itself.
Have tapped the various valves - no dice
Is the pump on its way out? muck on a diaphragm?
Don`t want to buy unneccessary parts
HELP PLEASE

 

[baxpoti]

initially low system pressure light - reset this thx to previous advice.

How?

 

[superdupergasman]

You pump could be jamming intermittantly....get out the multimeter and look for 240vac on the pump...if power stays on and pump stops....change the pump!

 

[scrabble]

de-energised
removed one connector (yellow) on pressure valve
re-energised
run boiler for a minute
de-energised
reconnected connector
re-energised
low system pressure light extinguished