Alto-Shaam Combi Oven Error Code E100: Maintenance Reminder Timed Out

What does Alto-Shaam error code E100 mean?

Combi ovens remind the operator when routine care is due, such as cleaning a filter or descaling. Each reminder has a time limit. When that limit runs out and no one has marked the item done, the control posts E100 One or more maintenance reminder has timed out. This is not a malfunction. Nothing has failed; the oven is telling you a task is overdue. The manual's remedy is straightforward: open the maintenance reminder screen, do the item that timed out and reset it. The reminders themselves carry numbers 1001 to 1005, which the manual lists separately, so the screen will show which one is overdue. If you reset the reminder without doing the work, the message goes away, but the reason for the reminder remains, so it is best to complete the task first. A service call is only needed if the reminder keeps returning after the work is done.

Affected models and control systems

CT PROformance and CT Classic ovens in all six sizes, 6-10 to 20-20, electric and gas. The individual reminders carry the numbers 1001 to 1005.

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

• E100 maintenance reminder message on the display
• A reminder item listed on the maintenance screen
• Oven otherwise running normally

Possible causes

Listed in Alto-Shaam's documentation

• Maintenance reminder not completed

Other likely causes — what usually sits behind error code E100 on this control. A technician confirms which one it is before any part is replaced.

• The reminder was reset before the work was done, so it timed out again
• The reminder interval was set shorter than the kitchen's actual cleaning schedule

Safe checks before calling for service

How a technician diagnoses error code E100

1. Read the code and open the reminder list to see which items are overdue.
2. Confirm the task was actually done, such as descale or filter service.
3. Check that the reset was recorded and that the date and time are correct.
4. Look for related error messages that the neglected task may have caused.
5. Perform the overdue service and reset the reminder.

How error code E100 differs from similar codes

E100 covers any timed-out reminder; the individual reminders 1001 to 1005 are listed separately in the manual.

Technical reference

Maker documentation

Alto-Shaam owner support

Edition

MN-35949 Rev 08 03/22

Models / control

Combitherm CT PROformance (CTP) and CT Classic (CTC)

Section

Error Codes, pp. 25-31

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.