worcester 26cdi xtra

[brian_the_gas]

Hi to you all! First post etc. so please be patient. I got a question, (not being to familiar with combi boilers) I have noticed that the system pressure is increasing on its own accord ( the filler key removed ) not over night but gradualy. What i'm thinking is, could it be the diverter valve shot?of course I have to decrease the pressure via radiator drain tap and it's driving me nuts!!!!😡
Any help much apreciated
Brian.😕

 

[ajs heating]

if its doing it constant with heating on/off and not falling again.
sounds like the dhw heat exchanger passing to the primary circuit.

one way to check if your sure your filling key is not passing water.
isolate the mains stopcock if this then stops h/e is faulty.

 

[brian_the_gas]

Thank's for teh quick reply ajs
Yep I keep the key removed at all times, and yes the pressure increse occurs with the c/heating off, it's only just started happening and of couse with it being summer the heating is off all the time!