Troubleshooting the E-4 CPU Too Hot Error Code

Overview

The E4 CPU Too Hot error occurs when the control board and microprocessor exceed 180°F (82°C). This error is detected by a temperature circuit within the control board. Proper troubleshooting can help avoid unnecessary service calls and ensure efficient field repairs.

Call Avoidance

To help the end user resolve the issue without a service call:

Check Vents / Louvers, ensuring the vents or louvers on the side of the fryer are uncovered and clean. Remove any grease, dust, dirt, or debris.
Verify correct spacing around the fryer. Spacing should be at least 1 in. (25 mm) at the rear of the fryer to allow proper airflow. NOTE: No spacing is required at the sides of the fryer.
Remove any heat source from either side, front or rear of the fryer. If the error persists, proceed to field troubleshooting.

Field Troubleshooting

If call avoidance steps do not resolve the issue, proceed with the following field troubleshooting steps.

Recommended Parts:

Control board

Recommended Tools:

Basic hand tools

Thermometer

Troubleshooting CPU Error

Verify all steps from the call avoidance section have been performed.
If the ambient air temperature near the control is below 100°F (38°C) and the E4 error continues, replace the control.