Ultrafryer Commercial Fryer Error Code DONE: Cook Cycle Completed

What does Ultrafryer error code DONE mean?

The UltraStat 23 times each cook cycle for the product you selected. When the programmed cook time reaches zero, the controller changes its display to DONE so that the operator knows the food is ready to come out of the oil. The manual's Display Descriptions page states it simply: a cook cycle has been completed. The control is not reporting any malfunction here, and nothing in the manual calls for troubleshooting. Because the oil keeps heating, leaving product in the vat after DONE will overcook it. The display reads exactly DONE, and it is part of the ordinary cooking routine. If DONE appears at an unexpected time, the likely cause is the programmed cook time or the key that was pressed, not a broken part. The manual page we used does not say whether the controller also sounds a tone, so check how your own unit behaves.

Affected models and control systems

This display is documented for the Ultrafryer UltraStat 23 controller, the MEC-110 with enhanced SMS, in the July 2009 operating instructions.

Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.

What you may notice

• DONE showing on the controller
• Cook timer at zero
• Product still sitting in hot oil until it is lifted

Possible causes

Likely causes — what usually sits behind error code DONE on this control. A technician confirms which one it is before any part is replaced.

• A programmed cook cycle has run to the end of its time
• Cook time was set shorter than the product needs, so DONE arrives too early
• The wrong product key was pressed, so a different cook time ran
• A previous cycle was never acknowledged, so DONE stayed on the display

Safe checks before calling for service

How a technician diagnoses error code DONE

1. Check the programmed cook time and temperature for the product key in question.
2. Compare the controller's timer against a stopwatch over one cycle.
3. Verify the temperature probe reading against a calibrated thermometer.
4. Review the product program settings with the operator's cook chart.
5. Replace the controller only after the timer is shown to run wrong against a stopwatch.

Technical reference

Document

UltraStat 23 Operating Instructions for the MEC-110 with Enhanced SMS, 10-Product Cooking Controller

Edition

30A216 July 2009 (footer; 229-51339 Rev A, 2007 FAST)

Models / control

Ultrafryer UltraStat 23 controller (MEC-110 with enhanced SMS)

Section

Display Descriptions, printed p. 9 (images with descriptions); FILTER prompt on p. 7; no fault code table

Checked

October 2026

We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.