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Mend Worcester Bosch 37CDi Home Heating Systems

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Mend Worcester Bosch 37CDi Showing Code

Worcester Bosch Greenstar 37CDi Combi showing code U9?

My boiler is showing code U9, I know this means that the temp has risen to 99 degrees. The result when I turn the hot tap on the boiler just stops and we have no hot water. What causes this and what can I do to mend it? Do I need an engineer?

Miranda Prochazka
March 2012
Worcester Bosch 37CDiHeating, Home Heating SystemsBosch Showing Code
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