OTIS GOEC Escalator Fault Codes: Causes and Troubleshooting Guide Part 1

The OTIS GOEC escalator control system monitors a range of safety devices, electrical signals and mechanical operating conditions. When an abnormal condition is detected, the system may stop the escalator and display a fault message through the Service Tool or Operation / Control Panel.

Understanding these fault indications helps maintenance personnel narrow down the source of a problem and identify the appropriate inspection points.

This guide organizes the 13 fault categories covered in the supplied technical material, including the original display codes, possible causes and corresponding troubleshooting methods.

Important: The codes and procedures below follow the supplied reference document. Actual equipment configurations may vary. Inspection, reset and component replacement must be performed by qualified escalator technicians in accordance with the applicable service documentation.

1. Missing Step Detection

Fault codes

Possible causes

This fault may occur when a step has been removed during maintenance and not reinstalled. An incorrectly adjusted sensor may also trigger the missing-step detection device.

The reference document specifies a distance of approximately 4 mm between the sensor surface and the step-wheel bearing.

When the safety device detects a missing step, the ECB board receives the signal and stops the escalator.

Troubleshooting

Check that all steps have been correctly installed.

Inspect and adjust the sensor position according to the equipment specification.

After correcting the underlying problem, follow the approved procedure to reset the ECB board.

2. Landing Plate Detection

Fault codes

Possible cause

When a landing plate is lifted, the detection rod resets and activates the associated safety switch. The ECB board then receives the signal and stops the escalator.

Troubleshooting

Inspect the clearance between the landing-plate switch and the landing plate. Adjust the distance in accordance with the equipment requirements and verify the switch operation.

3. RSFF Board and Wiring Fault Monitoring

Fault indication

Service Tool: 0104 FfCode xxxx

Operation / Control Panel: OTIS xxxx

The actual xxxx value depends on the detected fault.

Possible causes

The supplied material identifies two main possibilities:

A fault in the safety-circuit wiring.

An incorrect RSFF address setting.

Troubleshooting

Step 1: Check ECB software settings.

Connect the service tool, enter the Adjust interface and select 1-3-4 to access the I/O settings page. Check that the relevant addresses have been entered correctly.

Step 2: Read the RSFF fault code.

In the Adjust interface, select 1-1-3 and record the displayed RSFF xxxx value.

According to the reference material, the first two digits represent the upper-landing FCODE, while the last two represent the lower-landing FCODE.

For example, RSFF 0415 indicates upper-landing FCODE 04 and lower-landing FCODE 15.

Step 3: Check the fault-state indicators.

Select 1-1-2 in the Adjust interface. Use the down-arrow key to reach pages five and six, where the indicators fu1–fu4 and fl1–fl4 are displayed.

fu refers to the upper landing.

fl refers to the lower landing.

Uppercase letters represent binary 1; lowercase letters represent binary 0.

For example, fu1, FU2, FU3, fu4 represents the binary pattern 0110, corresponding to FCODE 06. The same pattern for the fl indicators represents lower-landing FCODE 06.

If the wiring and settings have been checked but the fault remains, the reference material recommends replacing the RSFF board.

4. Brake Lining Wear Detection

Fault codes

Possible cause

When the brake lining wear detection device identifies wear, it sends a corresponding signal. The reference states that when the escalator reaches 999 starts under this condition, the ECB board prevents power from being supplied to the main motor through the main contactor.

Troubleshooting

Inspect the brake linings and replace worn linings as required. Confirm that the braking system is in proper working condition before returning the escalator to service.

5. Main Motor Overtemperature

Fault indication

Service Tool: 0106 Motortem.B2

Operation / Control Panel: OTIS GR6 on the six-group display, or OTIS B2 on the 30-fault display.

Possible cause

The reference material states that when the main motor winding temperature exceeds 155°C, the thermal switch changes state and sends a signal to the ECB board, causing the escalator to stop.

Troubleshooting

After the motor has cooled, qualified technicians should:

Check whether excessive brake tightness is causing heat buildup during operation.

Inspect internal motor wiring for short circuits.

Check whether connector P6 on the ECB board is loose.

Inspect the motor windings for damage or burnout.

Do not restart the escalator until the cause of overheating has been identified and addressed.

6. Brake Lifting Mechanism Monitoring

Fault codes

Possible cause

The monitoring device detects that the brake arm has not moved as expected. This may mean that the brake fails to release when the motor starts or fails to engage when the motor stops.

The ECB board then prevents the main motor from receiving power through the main contactor.

Troubleshooting

Inspect the brake electromagnet and replace it if defective.

Check and adjust the clearance between the safety switch and the actuating rod.

Verify that the relevant ECB parameter settings are correct.

7. Power Supply Monitoring

Fault codes

Possible causes

The reference material identifies phase loss, incorrect phase sequence and undervoltage as conditions that can cause the escalator to stop.

Troubleshooting

Verify that the incoming power supply is normal.

Check the connections of the main supply conductors L1, L2, L3 and N.

Confirm the phase sequence and correct any wiring issue according to the approved electrical procedure.

Electrical measurements and wiring work must be performed by qualified personnel.

8. Reverse-Direction Protection

Fault indication

Service Tool: 0113 MotorB1 NRD

Operation / Control Panel: OTIS NRD

Possible cause

The protection device detects insufficient speed during upward operation or a tendency for the escalator to move in the opposite direction. The ECB board receives the signal and stops the escalator.

Troubleshooting

Check the main motor power wiring and resolve any wiring faults.

Inspect the motor speed sensor and replace it if defective.

Check the sensor installation gap. The sensor must not be positioned too close to or too far from the motor brake disc.

After correcting the fault, follow the approved ECB reset procedure.

9. Simultaneous UP and DOWN Logic Error

Fault indication

Service Tool: 0114 up&dwn E12

Operation / Control Panel: OTIS E12

Possible causes

The UP and DOWN relays are energized simultaneously. Incorrect operation, such as pressing the UP and DOWN buttons at the same time, may also produce this condition.

Troubleshooting

Inspect ECB board diodes D1 and D2 for damage or breakdown.

Check the key-switch signal wiring for short circuits.

Replace defective components only after confirming the fault.

10. Missing UP or DOWN Logic Signal During Operation

Fault indication

Service Tool: 0115 up&dwn E11

Operation / Control Panel: OTIS E11

Possible causes

The supplied material identifies the following possibilities:

The key switch was operated too quickly, preventing the UP or DOWN relay from energizing.

A fault exists in the key-switch wiring.

The UP or DOWN relay is not operating correctly.

Troubleshooting

Operate the key switch for approximately 1–2 seconds, as specified in the reference material.

Inspect the key-switch wiring and correct any faults.

Check the UP and DOWN relays and replace defective relays or the ECB board when the diagnosis confirms the need.

11. Inspection-Mode Logic Error: KSU or KSD

Fault indication

Service Tool: 0116 KS_INS E14

Operation / Control Panel: OTIS E14

Possible cause

The supplied material associates this fault with an improperly inserted dummy plug or an inspection socket that remains connected to the inspection box while the key switch is operated.

Troubleshooting

Check that the dummy plug is correctly inserted into the inspection socket before proceeding, following the applicable service instructions.

12. Emergency Brake Not Lifted

Fault indication

Service Tool: 0117 Emer.Br.S53

Operation / Control Panel: OTIS S53

Possible causes

The reference material lists three possible situations:

The escalator is operated downward on its first run after a power interruption when equipped with an auxiliary brake.

The auxiliary brake fails to reset within five seconds during upward operation.

The auxiliary brake activates unexpectedly while the escalator is running.

Troubleshooting

Follow the prescribed upward-operation reset procedure where applicable.

Check and adjust the position of the auxiliary-brake reset blade.

Inspect relays K02 and K02.1 and the electromagnet; replace defective components as required.

13. Emergency Brake Relay Monitoring

Fault indication

Service Tool: 0118 Emer.Re.K02

Operation / Control Panel: OTIS K02

Possible causes

The reference material identifies auxiliary-brake relay self-latching as a possible cause.

Troubleshooting

Inspect relays K02 and K02.1 and replace them if defective.

Check the auxiliary-brake wiring and correct any faults.

Check timer relay K067. The supplied reference specifies a 2-second setting.

Once the underlying fault has been corrected, follow the approved procedure to reset the ECB board.

Maintenance Recommendations

When diagnosing an OTIS GOEC escalator fault, maintenance personnel should begin with the exact fault indication and the operating condition in which it occurred. A single display code may point to a monitoring circuit, sensor, wiring issue or mechanical condition, so the displayed code should guide inspection rather than replace it.

A practical diagnostic sequence is:

Record the complete Service Tool and control-panel fault indications.

Identify the affected safety device or monitored function.

Inspect the relevant mechanical components, sensors, wiring and control-board settings.

Correct the confirmed cause before resetting the system.

Verify the relevant safety functions and operation in accordance with the manufacturer’s procedures.

Safety note: Never bypass safety devices or repeatedly reset a fault without identifying its cause. Brake, motor, power-supply and safety-circuit inspections must be carried out by qualified escalator personnel.

Conclusion

The 13 fault categories covered in this guide illustrate how the OTIS GOEC control system monitors step installation, landing plates, brake condition, motor temperature, power supply, direction of travel and emergency braking.

Accurate fault-code interpretation, systematic inspection and correct corrective action help maintenance teams identify problems more efficiently while maintaining escalator safety.

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