AC controller fault #35337 (CORE One L)

What happened?

The printer is showing the message "Power grid is operating outside of specification". This error message is triggered in case of an issue with the electrical network.

Error name: AC controller fault

Error code: #35337

How to fix it?

Ensure the printer is connected directly to a stable power source. Avoid using UPS units or generators.

If the issue occurs with the printer connected directly to an electrical socket, we recommend checking for issues on the electrical grid. The power supply operates with an input in the range of 100-240 VAC, 50-60Hz.

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17 comments

backyardKiwi

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I ran into this problem too - used to rely on a quality On-Line UPS for having clean power in the middle of nowhere in rural New Zealand (crappy power grid). It failed on the second print which lead me to this thread. Now I have it running on the crappy grid power and hope the best - BUT I'm in the process of upgrading our house power supply to a Grid-connected battery solar system, which is basically a 7.5 kW Online-UPS. What do I do then? This really needs to be fixed, there is absolutely nothing wrong with Online-UPS power output...

Паша Ляшук

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Prusa Core One L, що з дбж, що без нього, постійно на довгому друкуванні виникає проблема: то велика температура столу, це якщо підключити без дбж, якщо з дбж то проблема з мережею.І прошивкі міняв на нові, і скидав на стару, нічого не допомагає. Хоча два принтера інших виробників працюють без проблем.

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This happens to me at least weekly sometimes for no obvious reason and while not printing. The article says to avoid UPS, but a quality UPS with line conditioning is a great assurance of long print jobs if power gets weird or blinks. We can't all guarantee an amazing power grid, so the sensitivity needs to be reasonable.

Joe

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I also got it with my Core One L now already two times mid print.

Gil LaCroix

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I have had the same error twice in the last 2 days. Am now afraid to start a long print.