@bearer said in Heater Fault reset - negative time:
does it persist or could it be a one-off daylight savings time thing?
Well, it did it consistently (multiple times) while I was playing with my heaters (hence multiple faults) this morning.
Both the printer and the firefox had been running since before the clocks changed. Having power cycled the printer and stopped and started a new firefox, it now works as expected with no negative time.
Whether it's clock-change-related or coincidence, switch-it-off-and-on-again seems to have fixed it.