Hi. Recently the pressure in my boiler constantly drops to practically zero. To turn the heating on I release water into the boiler to bring the pressure back up to 1 bar. After the heating being on for about 15 minutes the pressure shoots up to over 3 bar at which stage I turn off the heating so it doesn't explode. The pressure quickly drops to below 1 bar again. Does anyone know what could be causing this?
your boiler expansion vessel is possibly EMPTY and needs a recharge of AIR via a car foot pump,find the valve on expansion vessel, remove the cap,test pressure then inflate via the car valve to about 1 bar, or approx 15 psi. then re pressurize the waterside backup to 1 to 1.5 bar
wirecutterman
March 2010
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.