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How can I fix my worcester greenstar HE?

boiler fires and stays on for four or five minutes then goes off showing E4 fault sign, any ideas?
cyber, November 2010
sounds like the pipe which takes the water out of the boile ris frozen i had the same proble poured hot water ove rthe pipe outside and it sorted it

kav, January 2011
EA fault (not E4?) refers to ignition fault.
Either failing to light, or failing to establish flame, ensure the gas is on and available, if yes, then it's not something for you to mess with as it's gas related.

Carefree, November 2010
link Click here to see other fixes for Worcester Bosch Greenstar HE.