URGENT HELP PLEASE! boiler dripping

longwalks1

right, had thermostat turned down to 10 all day today, but left the boiler on, come home and its sitting at 2.5bar (is this classed as 'cold'? - not been used allday, but still on)

Have drained a pint out of my downstairs radiator by bleeding it, pressure has dropped very slightly.. should i continue draining more water out?

Thanks again everyone for your patience

gas4you

If all rads are cold, drain the system until pressure reads about 1.2-1.5 bar.

longwalks1

thanks gas4you, how much roughly will i need ot drain out the system? 1 pint and it hardly moved from 2.5 bar, might i actually need to drain off 3 or 4 or more pints?

keystone

If the boiler itself is not "hot" and sort of warmish you've got 2½ bar of pressure then yes its too high. When the boiler fires up properly it'll drive it over 3 bar, the PRV will lift and you'll get water out of the outlet again. Check your manual but I'm guessing your boiler should be at iro 2 bar when hot.

Continue letting some out the way you are although I suspect you'll find it easier if you can locate a drain point. Doesn't matter how much you take out just get the presure down to something more sensible.

System pressure should be between 1 and 1½ bar when the system is cold as stated yesterday. Best time to check this is first thing in the morning just before it fires up - unless you are running it all night.

You'll need to get the PRV checked - don't forget.

Cheers