heating, Oil boiler not running?

just to add, if you have a sealed system, you must leave the filling loop taps 'open' when purging the system of air using the hose method...and come to think of it, are you aware if your system is fed from an attic header tank, or do you fill the system using a filling loop? all combis are sealed systems....

mark properjob
February 2012

Hi, i'm an oftec engineer..
start again, and place the honeywell's manual lever locked into 'manual'...then connect a hose pipe to a drain-off cock on the system, and put the other end in a bucket outside.
open the drain cock, and let it run until ypu get no more bubbles in the bucket. then close off the drain cock, bleed all rads.
Then go around house, and close off the flow valve (thermostatic valve side if fitted) on all the rads that are heating up, thus forcing the flow to the airlocked part of the system. this always works. also, check circulation pump isnt whining, and unscrew the silver 'button' on its face until water dribbles out...could be air in the pump.
best of luck!!

mark properjob
February 2012

Need to have unit off and valves on manual with pressure up then bleed.

Old Guy
February 2012