Elevator fault codes provide important information for technicians during maintenance and troubleshooting. However, in some cases, the actual cause of a failure may not be directly listed in the fault description and requires further analysis of related safety and position detection components.

This article introduces a real troubleshooting case of an LG MGP elevator with Fault 62, including the fault symptoms, possible causes, inspection process, and final repair solution.

Fault Description

Elevator Model:
LG MGP

Fault Symptom:

The elevator operates normally at high speed and can stop accurately at the target floor. However, after the door opens, the elevator immediately closes the door and automatically returns to the lowest floor at correction speed.

During this process, the system displays Fault 62.

Understanding LG MGP Elevator Fault 62

According to the fault code description, Fault 62 indicates a synchronization position error.

The main meaning of this fault is that the elevator system has lost the correct floor position reference.

The recommended inspection points usually include:

• · Floor position data
• · Encoder operation
• · Leveling switch
• · Hoistway self-learning data

If these components are abnormal, the elevator may lose accurate position information and trigger a synchronization error.

Troubleshooting Process

During the initial inspection, technicians checked the commonly suspected components:

Encoder Inspection

The encoder was checked for:

• · Connection condition
• · Signal feedback
• · Abnormal operation

The encoder was confirmed to be working normally.

Leveling Switch Inspection

The leveling switch was also inspected and no abnormality was found.

Hoistway Self-Learning

Since the fault was related to position synchronization, hoistway self-learning was considered as a possible solution.

However, before performing further adjustments, technicians continued checking other related position detection devices.

Hidden Cause: Lower Forced Slowdown Switch

During further inspection, an important component was found that was not clearly listed among the main possible causes of Fault 62:

The lower forced slowdown switch.

The inspection found that the switch had poor contact performance.

Due to unstable switching signals, the elevator controller received incorrect position information during operation, resulting in a synchronization position error.

Repair Solution

The repair procedure was:

1. Check the condition of the lower forced slowdown switch.

2. Confirm that the switch contact was unstable.

3. Replace the defective switch.

4. Test elevator operation after replacement.

After replacing the lower forced slowdown switch, the elevator returned to normal operation and Fault 62 was completely eliminated.

Troubleshooting Tips for Elevator Technicians

When troubleshooting LG MGP elevator Fault 62, technicians should not only focus on the components listed in the fault manual.

A complete inspection should include:

✅ Encoder signal
✅ Leveling switch
✅ Hoistway learning data
✅ Forced slowdown switches
✅ Position-related safety inputs

Some faults may be caused by signal instability rather than a failure of the main control components.

Conclusion

The LG MGP elevator Fault 62 case shows that accurate fault diagnosis requires both technical knowledge and practical field experience.

Although synchronization position errors are commonly associated with encoders or leveling systems, related position detection switches, such as the lower forced slowdown switch, should also be carefully inspected.

For elevator maintenance companies and technicians, identifying the actual root cause can reduce troubleshooting time and improve repair efficiency.

YuanQi provides a wide range of elevator spare parts, including controllers, switches, sensors, and other elevator components, helping maintenance teams quickly restore elevator operation and improve service efficiency.

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