How to mend Heating System Water Pressure Worcester Bosch

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

Help fixing?

Boiler cycle?

I only have heating downstairs... ?

Change time on boiler. Clock?

Worcester Bosch free standing boiler?

Worcester bosch Highflow 400 rsf?

Worcester Bosch 240 combi?

worcester24i rsf?

Home Heating Systems?

Pressure above 2?

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over pressure?

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My heating is on?

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I have a greenstar 440 displaying d5, I have tried the reset code ?

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re pressurizing boiler?

Greenstar Highflow 440?

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