Troubleshooting an E-10 High Limit Error

To avoid electrical shock or property damage, disconnect power before installing or servicing equipment. A qualified technician must perform the service procedures.

Overview

There are 3 main components to the high limit system, High limit probe, Reset switch, and High limit PCB (board). The high limit RTD probe is monitored by the high limit PCB based on a 100 ohm scale at 32ᵒF or 0ᵒC. The ohm reading will increase as the temperature rises. Once the high limit probe has reached its trip point this will trigger the high limit PCB to give the error code. After roughly 15-30 minutes to cool down, the high limit can be rest by a 5vdc momentary switch located behind the door under the control shroud. The high limit PCB is supplied 24 VDC through the PMU/GMU where the high limit PCB attaches on top of it. Refer to image below.

• A solid yellow LED light on the high limit PCB (As shown below) indicates the high limit circuit is closed and in normal operating condition.

• A solid Red LED light on the high limit PCB indicates the high limit circuit is open and needs to be reset by the reset switch.

• A flashing Red LED on the high limit PCB indicates a critical error and a power cycle by the main power switch is required.

Call Avoidance

Perform these steps first to avoid having to go to the restaurant and adding value for your customer. These are steps we recommend every service company provide prior to going out and what makes Henny Penny the partner top food service chains can’t live without as these will save our customers money if successful. These steps can be provided over the phone, over WhatsApp, face time etc… with the restaurant manager. Try the following steps first:

1. Ensure the fryer is full of oil to the upper-level line if the oil is hot, and lower-level line if oil is at room temperature.

2. Give the fryer 15-30 minutes to cool down before trying to reset the high limit. Once cool, reset the high limit by pressing and releasing the reset button, located under the vat that has the error. For more details on this process watch this video: E-10 High Limit Tripped Troubleshooting F5/LOV300 - YouTube

3. For nuisance or intermittent E-10 high limit errors, make sure there is no black carbon build-up on the high limit probe and elements. If so, perform a deep clean to get rid of the carbon build-up. Watch this video for deep clean instructions: Deep Clean with F5/LVE300 - YouTube

4. If the E-10 error persists, using the fryer's main power switch, cycle power to the entire fryer.

Field Troubleshooting

1. For an E-10 that won't reset, do the following:

   1. Power down and disconnect the fryer from power.

   2. For the vat with the E-10 error, remove 3 cross-tip screws, and all 2 3/8" nuts to drop-down the PMU/GMU mounting brackets.

   3. Unplug the P3 connector on the high limit PCB and check continuity with the meter leads plugged into the connector that goes to the reset switch. Refer to image below.

      

   4. Press the momentary reset switch, with meter leads inserted in the connector, you should have continuity and show a closed circuit. The switch is normally open (NO) and shows an open circuit (no continuity).

   5. Based on test results, do the following:

   • If the reset switch tests faulty, then replace.
   • If the reset switch tests good, then proceed.
2. With the reset switch testing good, do the following:

   1. Unplug the P1 connector. Refer to image below.

   2. Insert meter leads in the male plug and check the ohm value to compare against the 100 ohm chart (Temperature Probe Resistance / Ohm Chart (custhelp.com)).

   • For full vats, check both probes (2 wires per probe) and determine which one may be faulty.
   • For split vats, check one set of probe wires.

Make sure the probe is within specification. You will need to know the temperature of the oil to be able to compare your ohm reading to the chart. The probe should be within 5ᵒ of your reading from the chart and oil temp. If more than 5ᵒ out of spec and the probe is clean and free of carbon build up, then replace it. It is best to take multiple readings at different temperatures for the most accurate results. If the probe checks within specs. and still won’t reset, replace high limit PCB.

Other Possibilities

For intermittent issues:

• Check the placement of the high limit probe in the brackets on the elements. If out of spec this can cause intermittent issue.
• Check that the high limit probe is not loose inside the brackets that secure it.
• It is possible there is a break in the wiring somewhere on the fryer. Ensure all high limit wiring is in good condition.

If the error persists contact Technical Support for further assistance at +1-800-417-8405