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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.