Potterton performa 28i - ? expansion vessell

[nielsenm]

Hi,

My potterton performa 28i is sick!! It is continually losing water out of the what I would call the overflow pipe (about a litre a day) - thus needs topping up via the filling loop at least once a day usually more. The engineer has changed the safety value twice, the overheat thermostat, the diverta switch and nonthing has help. I have even pumped up the pressure vessell to 1 bar.

The system pressure guage will continually fluctuate. When i have filled it up the system with water to 1.5 bar when the heating is on it will go up 3bar and drop back down until empty!!

Any ideas?? Help!!!!

 

[Baxmax]

Fit a new expansion vessel

 

[nielsenm]

my engineer is not keen to do this he as says he has to take boiler off wall etc to fit and has suggested a new boiler.

Do you know if you should drain part of the system down before pumping up the pressure vessel

 

[baxpoti]

Fit a new expansion vessel

In the mean time top it up to 0.5 bar cold and reduce the c/h temp to about half way.

 

[nielsenm]

Thanks. Was told that should drain 1 raditor to reduce pressure in the system before topping up the pressure vessel. is this correct?

 

[Baxmax]

External wessel

 

[Garfeild]

Im sure others have thought of this but its a dodge ive used before on a temporary basis until a proper fix can be done.

Just drain a rad in an unused room by about 75/80% then turn the valves back on,the rad then acts as an expansion vessel.