Hi all, I run a property maintenance company working with Estate agents in London. They've asked us to carry-out EICRs for them, so we've been working with a few electrical companies to carry these out on our behalf (we're not NICEIC/NAPIT accredited). Anyway, one of these guys went to a new (completed in mid 2016) flat and issued an Unsatisfactory EICR and observed one C3 (plastic consumer unit) and on C2 (under size rated MCB.) He explained that the C2 was because one MCB should be 32Amp, not the 20Amp that's installed. Is this enough to deem the installation unsatisfactory? I would have thought that having a 20Amp MCB would make the the installation more sensitive, and potentially trip more, but not more dangerous... If it makes any difference, this MCB was installed on the "Heating/FCU circuit". He's given us a quote to install a new one and retest for £240... As that was the only C2 found, wouldn't he just need to test that circuit? Does he need to retest the whole installation? Any thoughts would be welcome.