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I only have heating downstairs... ?
Pressure above 2?
My heating is on?
I have a greenstar 440 displaying d5, I have tried the reset code ?
Worcester Bosch free standing boiler?
Change time on boiler. Clock?
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Greenstar 25 combo boiler?
my greenstar highflow 440 boiler is showing an error code C1?
How do I rectify aU9 Code?
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