I upgraded to 533, ambient temps were milder (about 70F) and I completed three successful roasts yesterday without the Erc 0032. Since upgrading from 515 and completing fan calibration, my power seems much more robust. Typically before upgrading, I would need to complete most of my roast at P9 nearing FC, then modulating down to P8/P7; F2/F3 even with a 500g batch size- completing FC at about 11-12 min with ~ 25% DV. Now my roasts begin with P7, fan used is F3-F5, P6 near FC, and roasts complete faster with same DV. FC usually complete by ~10 minutes.
When I was getting ERC 0032 I was under the assumption that power levels were equivalent to before upgrading firmware, and P9 may have been too hot for my batch size. Just a hypothesis.