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how can i fix my worcester 20/25 combi?

my worcester combi 20/25 goes into lockout when the heating is on. its ok just heating the water
alan morris, September 2007
u have no auto by pass and have trvs. take one trv head off

kris, September 2007
model name

,, September 2007
link Click here to see other fixes for Worcester 20/25.