What does it mean when my Worcester CDi boiler does this?

16 Apr 2008
Reaction score
United Kingdom
I have year old Worcester Greenstar 42CDi boiler.

This morning the display alternated between the temperature and showing this symbol –II- when I requested the rads to come on for the first time in a week.

It seemed to do this for around 10 minutes before the boiler kicked in properly and the temperature increased.

Can’t see this occurrence mentioned in the manual.
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It's low fire to make sure the condense trap is full. Normally does it if the power has been off.
Thanks for that super hero.

Just goes to show how daft I am, as I read about the condensate trap but the manual mentioned the letter K and -ll-

I have just realised that K is the reference point in the diagram while I was thinking K would flash up if it was the condensate trap.

Just goes to show it doesn’t matter how simple the instructions are some people still get it wrong.

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