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Mend Worcester Bosch 28CDI System Pressure Heating

System Pressure keeps building in worcester bosch 28cdi?

The system pressure keeps going above 4 bar until I release water through valve in radiator, with hot water off it does not build up. Non return valve fitted to hot water pipe serving mixer shower recently fitted. Any advice?

Dave
October 2008

Worcester Bosch Worcester Bosch 28CDI Heating, Home Heating Systems Worcester Bosch System Pressure Heating System

Isolate cold water mains going to the boiler and monitor (for a few hours) if problem stops, your domestic hot water heat exchanger needs replacing.

I. Sharma
October 2008

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Worcester Bosch 28CDI: High System Pressure