Puma Potterton 80 low pressure

[jbw1]

Hi.

Please could you advise.

Moved into house 6 months ago. House is around 10 years old - Puma Potterton 80 boiler is around that age.
Pilot light is there - but not firing up on demand from heating or hot water.
Low pressure red LED light is on.
Have turned on top up tap to fill up - but no sound of pressure. Turned off straight away.
Red LED light did not turn off.
Pressure gauge is full of water and leaking.
Red needle is on 2.5
Black needle is on 3.5


I'm hoping I can hold off buying a new boiler??
Does this sound repairable?
Thanks

 

[bster]

get a new pressure gauge so that you know the exact pressure - it may be that theres no pressure at all.

Whilst you wait for it to be fixed...

if your brave enough open a hot tap and keep filling the system (regardless of what the gauge indicates) until the boiler fires then immediatly turn the filling loop off.

 

[gasman26]

more than likely the low pressure switch is blocked, bridge the switch out, removing one of the wires does the trick.
drain down boiler, remove & clean L.P.S, replace pressure gauge at the same time.....

 

[Agile]

If the pressure is 3.5 then its too high and as you said already caused some leaking! Should be about 1.7 bar cold.

The low pressure switch is either failed or blocked.

Probably by tomorrow it will have sorted itself out.

If not then it needs a new LP switch. Probably about £24. needs draining boiler to fit !

Tony

 

[ChrisR]

Are you sure the temperature sensor above the pressure gauge isn't leaking (they always seem to need tightening) and dripping into the dial??

Don't pull a lead off the P switch or you'll leave a live end, unlplug the connector from the lower left corner of the pcb (2 yellow wires) while you sort out a fix.

 

[jbw1]

Thanks for the help guys.
Managed to get this sorted now.
Boiler drained and a few leaks patched. Pressure now on 1.5
Working again.

 

[Baxmax]

Great