Troubleshooting the E-18 (A-F) Level Probe Open/Shorted Error Code

Overview

These error codes indicate a fault with the fryer level sensing system. The fault is considered non-critical, and the unit may continue to operate depending on system conditions.

Error Code Definitions

• E-18 A – Right level probe open

• E-18 B – Right level probe shorted

• E-18 E – Left level probe open

• E-18 F – Left level probe shorted

An open condition indicates the controller cannot detect resistance through the probe circuit. A shorted condition indicates the probe circuit resistance is lower than expected or the probe is shorted to ground or another conductor.

Call Avoidance

Before scheduling a service visit, perform the following checks:

1. Turn the fryer OFF and then back ON to determine if the error clears.

2. Ensure the fryer is clean and free of excessive oil residue or debris around the level probes.

3. Check the probes for any visible damage or scratches.

If the error remains after these checks, field service may be required.

Field Troubleshooting

Recommended Parts

Replace only as required:

• Right level probe

• Left level probe

• GMU (Gas Management) Board

Recommended Tools

• Digital multimeter

• Basic hand tools (screwdrivers, nut drivers, etc.)

1. Determine which error code is active:

   • E-18 A = Right level probe open

   • E-18 B = Right level probe shorted

   • E-18 E = Left level probe open

   • E-18 F = Left level probe shorted

2. Inspect probe connections:

   1. Power OFF the fryer.

   2. Access the level probe connections.

   3. Inspect all connectors, terminals, and wiring associated with the affected probe.

   If connections are loose, damaged, or corroded:

   • Repair or reconnect as necessary.

   • Restore power and verify operation.

   • If the error is cleared, troubleshooting is complete.

   4. Inspect probe for any visible damage.

   • Replace probe if any damage is present.

   • If connections are good and no visible damage, proceed to Step 3.

3. Check probe resistance:

   1. Disconnect the affected level probe.

   2. Measure probe resistance.

      • For Open Faults (E-18 A or E-18 E):

        1. If the meter indicates an open circuit or resistance outside specification, replace the affected probe.

        2. After replacement, verify operation.

        3. If the error remains, proceed to Step 4.

      • For Shorted Faults (E-18 B or E-18 F):

        1. If resistance indicates a short circuit or resistance outside specification, replace the affected probe.

        2. After replacement, verify operation.

        3. If the error remains, proceed to Step 4.

      • If probe resistance is within specification, proceed to Step 4.

4. Replace the affected level probe, restore power, and verify operation.

   • Right probe for E-18 A or E-18 B

   • Left probe for E-18 E or E-18 F

   1. If the error is cleared, troubleshooting is complete.

   2. If the error continues, proceed to Step 5.

5. Replace the PMU board according to the applicable service procedure. After replacement:

   1. Restore power.

   2. Confirm all probe connections are secure.

   3. Verify the error code does not return.

   4. Do one of the following:

      • If the error is cleared, troubleshooting is complete.

      • If the error remains, proceed to the "Other Troubleshooting" section.

Other Troubleshooting

While uncommon, the following conditions may also cause these errors:

Damaged Harness

A wiring harness may have:

• Internal conductor breaks

• Shorted wires

• Connector pin damage

Perform continuity checks between the probe and GMU board and repair or replace the harness as necessary.

Contamination

Heavy contamination, carbon buildup, or conductive residue around the probe can cause false probe readings.

• Clean the probe and surrounding area.

• Recheck operation after cleaning.

Multiple Component Failure

In rare cases, both the probe and GMU board may be faulty.

• Verify probe operation before replacing the GMU.

• After replacing the GMU, confirm wiring integrity before replacing additional components.