Exterior 400IP Non-Resettable Power Hours Counter
Written by Will Fraser
Updated at January 16th, 2026
Question:
What happens when the Exterior 400IP non-resettable power hours counter reaches maximum?
Answer:
The Exterior 400IP (and similar units of the same era/firmware type like the Exterior 200) NON RESETTABLE POWER HOURS counter will count to a maximum of 65535 hours.
Once it reaches this maximum it will then 'rollover' back to 1 hour (there is no zero hour) with no errors or issues.
This can also explain why the total non-resettable hours can show a LOWER value than the resettable hours counter.
65535 hours is approx 7.48 years of constant power.