Randell Prep Table Error Code E1: Defrost Probe Alarm

What does Randell error code E1 mean?

The defrost probe sits on the evaporator coil and tells the Carel controller when the frost has melted, so defrost can stop at the right moment. If the controller loses that reading, it cannot tell when the coil is clear, so defrost may run on a timer or not at all. The display shows E1. The table often still cools for a while, which is why the alarm is easy to dismiss, but over time the coil can ice up, airflow across it drops, and the pans warm. The maker lists a defrost probe that has slipped off the evaporator coil, a damaged wire or plug on the probe, a failed probe input on the controller, and ice buildup that has cracked the probe lead. The first of these is worth noting because a probe that slides off the coil reads room-temperature air and ends defrost early or never starts it. E1 is the defrost probe. The control probe has its own code, E0, so the two should be told apart when describing the problem.

Affected models and control systems

This applies to Randell 8000-290 and 9000W-290 series prep tables with the Carel controller. The Danfoss controller uses sensor codes E01 to E04 instead.

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

• E1 on the controller display
• Frost building on the coil or the well liner
• Airflow weakening over days
• Pans warming late in a shift

Possible causes

Listed in Randell's documentation

• Defrost probe slipped off the evaporator coil
• Damaged wire or plug on the defrost probe
• Failed defrost probe input on the Carel controller
• Ice buildup that has cracked the probe lead

Other likely causes — what usually sits behind error code E1 on this control. A technician confirms which one it is before any part is replaced.

• Probe clip loosened by repeated defrost heating and cooling
• Lead brittle where it bends near the coil
• Drain partly blocked so meltwater refreezes around the probe

Safe checks before calling for service

How a technician diagnoses error code E1

1. Read the code and confirm E1, not E0.
2. Inspect the evaporator for frost and check that the fan moves air.
3. Locate the defrost probe and check that it is seated on the coil.
4. Check the lead and plug, then the wire to the Carel board.
5. Measure the probe resistance against a known temperature.
6. Run a defrost and confirm it ends on temperature, then replace the failed part.

How error code E1 differs from similar codes

E1 is the Carel defrost probe code. E0 is the control probe code on the same controller.

Technical reference

Document

Randell 8000-290 & 9000W-290 Series Prep Tables Operator Manual, PP MNL1803 Rev. I (12/25), Carel / Danfoss controller codes

Edition

PART NUMBER PP MNL1803, REV. I (12/25)

Models / control

Carel controller (8000-290 / 9000W-290)

Section

Carel Controller Codes and Danfoss Controller Codes tables, Service/Troubleshooting, printed pp. 5-6

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.