high pressure

[whancox1999]

have got a vokera compact combi boiler water pressure keeps rising up to 3 bars .We drain water to lower it but a few hours later its the same.There is no air in the radiators.Although we have drained water from the system(lots of) how come the system isnt empty by now can anybody help

 

[kevplumb]

turn off and disconnect the filling loop

if pressure is still rising prob dhw/h ex pinholed

 

[rolymo]

sounds like that the filling loop is passing water when it is turned off.
Try filling the system to the correct pressure and disconnect the filling loop and see if the pressure increases then.

 

[whancox1999]

disconnected loop not that ,can we run the heating with the hot water switched of to see if its the pinhole thanx for helping been driving us potty

 

[kevplumb]

check press gauge

turn water into boiler off

wait an hour or so

does it rise

 

[whancox1999]

pressure dropped we think that might be the problem can we repair it or is it a new heat exchanger

 

[kevplumb]

did you leave a hot tap open after shutting off the water ?

if so

new h ex

you might be better off with a fixed price repair

 

[whancox1999]

thank you very much for your help