Just learned that my Brinsea's temperature sensor is out by 2F, as in 2F lower than it was telling me the temperature was. So not the worst thing that could have happened (e.g. it could have been worse if the actual temperature was 2F over what it was saying), but it probably had an impact on the hatch. Brinsea told me it could have been the unit coming into contact with magnets during shipping. Anyway, luckily there is a calibration menu so I can correct it.
Let us know if it works out on the next hatch.
I so enjoy reading the results of folks projects.