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Approx 1.25 bar //www.diynot.com/diy/threads/ravenheat-he120t-low-nox-error-code-28-problem.237589/

Thanks, the reason I said about the flue sensor is that there was an old thread on here from 2010 with the same error code and replacing the sensor sorted his problem. As a new sensor did not sort mine that is why i was wondering if the new sensor was faulty. Better get someone in I suppose.

So if i put a test on the sensor should there be continuity?

HE120T Low Nox Condensing Boiler

I am getting the error code 28, if i bypass the flue sensor with a bit of wire the error goes away and the boiler works, so can i assume the flue sensor if faulty? If I do a continuity on the sensor there is none, should there be? I did buy a replacement on ebay and fitted it, the code did not...