Baxi combi 80he plus list of odd problems

[windymillerx]

Never really been happy with the way the boiler works. For instance the pressure in the central heating gauge always shows low even though I repressurise it every time I remember.
Of late it's started going funny. Recently we have set the independent programmer to off for the central heating yet if anyone runs the hot water, the rads get warm but only 1 or 2 of them! Also the boiler can and does start up showing hot water is being demanded yet no taps are on!
Any wise words on what is the matter would be gratefully received.

Thanks

 

[kev25v6]

A drop in pressure points towards a leak somewhere in the system.
The rads getting warm when hot water is running could be a stuck diverter valve. Does your boiler have an internal tank that it keeps full of hot water? It could be showing demand when it is heating the tank.

 

[windymillerx]

Eek. A leak! All the downstairs pipes to the rads are under concrete!!!!! The valve I can probably deal with....... The boiler has no hot water holding tank at all.
Got my work cut out.

 

[Agile]

Perhaps not but does it heat up the oversized expansion vessel?

Tony

 

[windymillerx]

Where's that?