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

the boiler is showing a c1 error, fan speed too low, how do I fix it please?
Linda, December 2017
it will probably need a new fan

dave B, January 2018
You start by doing a Gooogle search for - say "greenstar highflow 440 error C1"

That will lead you to many, many results.

here is a typical.

Read all of it.

https://www.diynot.com/diy/threads/worcester-greenstar-28-he-plus-fault-code-c1.73828/

zdbhadha, December 2017
link Click here to see other fixes for Greenstar.