Baxi 105e instant

[cristoforo]

Hi everyone when i put my ch on with only a 4 rads on the presure gauge goes from 1 bar to 2 bar wich i think is normal but if i put all 7 on the pressure gauge goes all the way round to 3 bar increasing a bit more with each rad that i put on. anyone any ideas ? it has just had a new expansion vessel put in to try and fix the problem but it is no different. The pressure in the vessel is 1 bar The boiler has been in for 18 months with no problems untill this
Thanks cris

 

[gazthepottertonengineer]

Did you check the pressure in the new expansion vessel before you fitted it also did you check for blockages in the pipe connecting to the expansion vessel

an easy way to solve this problem would be to fit an external expansion vessel onto your heating pipework