Potterton Puma 80 - Heating won't switch off?

Check the 3way 'boiler' switch (constant/off/timed) if faulty this may give constant signal regardless of its position.

Voltdrop
December 2015

2 is to high 1.5 bar is the most you need they will run right down to 0.7 bar. if your loosing pressure and its not the prv ( overflow ) you have a leak some where under the floor may be
that amount of water in that time will evaporate you may not find leak till it gets much worse.

hi-spec plumbing
April 2007

thanks craig - 1 more question, the pressure keeps dipping down to about 1 bar - this seems a bit low for the system. However if I top up the water in the system to increase the pressure to around 2, it drops back down to around 1 within a couple of days. Can't see any leaks in the system, no drips from the overflow and no complaints from the flat downstairs! Is that necessarily a problem? thanks

James Ellvers
April 2007

your dhw micro switch may be stuck on it may need changing call an engineer he will varify it

craig
April 2007