How to mend Worcester Bosch Greenstar 18ri

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my greenstar highflow 440 boiler is showing an error code C1?

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Greenstar Highflow 440?

Change time on boiler. Clock?

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over pressure?

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I only have heating downstairs... ?

Pressure above 2?

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My heating is on?

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how to fix worcester greenstar 28i ?

Help fixing?

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