Worcester Bosch Boiler

Hi,  My Worcester Bosch Boiler is overpressurising causing a trip.  We set the pressure at 1.5Bar, but then it increases to as much as 3-4 bar.  What is causing this?

Thanks

Brett

Hi Brett,

You are getting mains water pressure into your boiler system.  This is caused by a number of components.  You may have corrosion/erosion in your heat exchanges causing the high pressure to enter the low pressure pipework.  You may also have a failed expansion vessel diaphragm.  Check these items with a service engineer.