Increased the pressure in relative's Puma 100e following being told the Low Pressure Warning light was lit. Likely cause was Water Co. engineers when fitting water meter. I found the "top up" pipe and valves and increased pressure to 1 bar when cold (as instructed by label on side of casing). Light went out and boiler started OK. After approx 20 minutes I noticed the meter is climbing. When it reached 2.5 bar I switched the boiler off because the house is unoccupied, the idea was to have the CH on twice a day during this cold spell. I checked that both the valves on the top-up piping were shut off completely (one simple on/off valve and the second was a radiator type valve). Any advice please?

Alan W, December 2009

Thanks for the super quick response.


I'm sure this will sound stupid, but I don't know a lot about these boilers. Does that mean a new expansion vessel and then recharging? An engineer's job?

If you can explain re an "expansion vessel" it would help me understand the problem.

Alan W, December 2009

faulty expansion vessel,requires recharging.

xgas1, December 2009