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potterton combi 80 high pressure problem?

potterton combi 80. first start for c.h. since april, rads get hot quickly but after 10 mins pressure gauge reads 3 bar and goes into red .any ideas?
nikki, September 2005
Pressure Vessel problem / holding water.

Andy Parkes, October 2007
central heating exchange vessel in boiler no good

nikki, September 2005
link Click here to see other fixes for Potterton Combi 80.