Boiler: Ariston MicroCombi 23MFFI
The boiler serves 4 small rads, pipework is all 8mm microbore.
A few weeks ago I added 3 TRV's to the radiators. Prior to this I had drained the system down. When filling the system back up I depressurised the expansion vessel by error thinking it was an air vent
. I posted a thread on here as I was loosing around 0.2bar over a week, rectified the error by draining the system down and re-pressurising the expansion vessel to 1bar. I then filled the system back up to 1.5bar.
It has been a few weeks now and the problem still occurs. I loose around 0.2 bar over a week I then top it up to 1.5 bar. What I have noticed is that when pressure has reduced by 0.2bar and I run the DHW for around 20 min the pressure will go back up to 1.5 bar.
I have thoroughly checked for leaks on the pipework and have lifted floor boards up and found nothing. I have checked TRV's when CH is cold and there are def no leaks.
Why am I loosing pressure of around 0.2bar a week. Does the fact that pressure will creep up when using DHW have anything to do with things? Or has the error of depressurising the EV ruined things?
The boiler serves 4 small rads, pipework is all 8mm microbore.
A few weeks ago I added 3 TRV's to the radiators. Prior to this I had drained the system down. When filling the system back up I depressurised the expansion vessel by error thinking it was an air vent
. I posted a thread on here as I was loosing around 0.2bar over a week, rectified the error by draining the system down and re-pressurising the expansion vessel to 1bar. I then filled the system back up to 1.5bar.It has been a few weeks now and the problem still occurs. I loose around 0.2 bar over a week I then top it up to 1.5 bar. What I have noticed is that when pressure has reduced by 0.2bar and I run the DHW for around 20 min the pressure will go back up to 1.5 bar.
I have thoroughly checked for leaks on the pipework and have lifted floor boards up and found nothing. I have checked TRV's when CH is cold and there are def no leaks.
Why am I loosing pressure of around 0.2bar a week. Does the fact that pressure will creep up when using DHW have anything to do with things? Or has the error of depressurising the EV ruined things?
