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Discuss Icos He30 combi boiler resolution L9/H9 fault codes in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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Hi,

I have resolved the issue.
I bought a set of clamps.
The source of the problem I believe was this:
'In the heating season *** I increase the boiler temperature control to near maximum.'
The boiler was simply running too hot.
I have set the flow temperature to approximately 65 degrees C with the aid of the clamps.
The house is toasty and the boiler hasn't locked out since.
Result.
Thank you all for your help, advice and insight.
 

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