potterton performa 24 fault?

[1983mk]

hi all, new to this site.
I have a problem with my combi boiler, its a potterton performa 24.
I had slight hot water at taps and no central heating the other day. I removed the H/exchanger and descaled it. re fitted it and i now have lovely h/w but still dont have Central heating. any ideas?
I have noticed that there is a 3 port valve to left hand side of boiler and if i am correct there is a switch that seems to should make contact with a pin from the 3 port valve however it looks stuck? do i require a new 3 port valve or just the inside part?
many thanks

 

[Billy Bob Bob]

so its a system performa not a combi,could be valve ,roomstat or programmer, try manually flicking the valve take the stat off the cylinder and turn up full

 

[1983mk]

no sorry its def a combi. i must of wrote wrong name down? does potterton prima mean anything

 

[Billy Bob Bob]

a prima is a heat only boiler,a performa is a system or combi boiler does it look like this one?Potterton Performa 24HE Eco Combi Gas Boiler Exc Flue 5110553

 

[1983mk]

yeah it looks like that.

 

[pauls]

never heared of a combi on a 3 port valve. i have however come accross a system on a combi with tank fed bathroom and seperate wc

 

[Billy Bob Bob]

sounds like you have a performa system boiler

 

[1983mk]

just got some instructions up on line and its not a 3pv(sorry) i think it is callled diaphragm diverter valve?

 

[Billy Bob Bob]

right try changing your diaprahm [DLMURL]http://www.gas-spares.co.uk/Catalogue/BAXI/BAXI-BOILERS-Combi/105-COMBI-Range/105e-combi/DIAPHRAGM-GLAND-REPAIR-KIT-std-models-BA5111137[/DLMURL] but are you saying your getting hot water but no heating?

 

[1983mk]

thanks. does the diapragm come complete or will i end up needing a whoe new valve. also if i take front off will i have to drain system down or will just isolation valves underneath do?

many thanks for help