Worcester Greenstar 28 CDI fault code

I came into the kitchen this evening and the boiler was flashing blue, when I opened the facia there was a warning triangle and the fault code EH with cause code 258 was displayed.

The manual says cause code 258 means 'internal error' but the fault code EH doesn't seem to be listed anywhere. I pressed the reset button which cleared the code and started the boiler working but I am a little concerned.

Any idea what the fault was and will I keep seeing it?

 

It means it's time to have the boiler looked at by a gas safe registered engineer you can find on near you at gas safes website.

 

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