potterton puma 100 low pressure

[will2016]

have no hot water, tried bleeding the system to increase water pressure on dial, it allows the water in but doesnt put light out, so no hot water or heating, any help please?

 

[breezer]

i have got one of them, bleeding the rads reduces pressure.

question is what happened in the first place for the pressure to drop?

try a search for filling loop and me , you will find instructions / picture of what to look for (but mine is the potty 100e)

 

[croydoncorgi]

Do not raise pressure above 2 Bar on the pressure gauge!!

If pressure is up but red light stays on, probably water pressure switch is blocked / broken. Very common problem.

 

[will2016]

my problem cleared for a while but is back, tried bleeding the radiatos, and topping up the system, no joy, how do i find the pressure switch and either fix it or change it please? thanks

 

[croydoncorgi]

Bleeding rads on a combi-powered system is almost always a waste of time. If there's air in the rads, that indicates a serious problem in itself.

The pressure switch is on the plumbing to the right-hand side of the casing towards the bottom. Its a round thing with two wires connected, with a third terminal isolated with a plastic sleeve.

Before you do ANYTHING inside a Puma (or any other boiler) turn it OFF and make sure its fully isolated from the mains. Then, depressurise the system by opening the drainoff you should find on a radiator tail somewhere and then drain out enough water to ensure that the boiler plumbing is empty. (If you're in a flat, the boiler will probably be the high point of the system. If it's a house with the boiler downstairs, you'll need to take out more water.) Do NOT use the isolating valves under the boiler unless you KNOW they're good or you're prepared to replace them. On this boiler, they're VERY likely to leak forever after! Remove the wires from the switch and unscrew it. It'll be obvious if it's blocked. Probably best to get a replacement before you start and replace it anyway.
Bear in mind that the probable reason it blocked was that the system had no corrosion inhibitor - add some when you refill. When you replace the wires, make sure they go on the right terminals on the switch.

 

[ChrisR]

Strictly as a temporary measure you can unplug the pressure switch at the pcb end. Bottom left connector, two wires same colour - yellow I think. Boiler will then work.

 

[will2016]

thanks for all the advice guys, however i have now discovered the pilot light is out, can get it relit but soon as i let the switch go it goes out, is there anyhope for getting this fixed, all the fitters are quoting £50 an hour to even look at it, and can't afford a new boiler or 100's for a fitter to tell me it aint working,

 

[weargas]

Strictly as a temporary measure you can unplug the pressure switch at the pcb end. Bottom left connector, two wires same colour - yellow I think. Boiler will then work.

no, no, no, no! no such thing as disconnecting a safety switch as a temporary measure.