Monarch escalator controllers monitor operating speed, direction, stopping distance, and handrail speed to help identify abnormal operating conditions. When a fault occurs, the controller displays a corresponding error code to indicate the detected issue.
This guide explains six common Monarch escalator fault codes, from Err1 to Err6, including their fault descriptions and the possible causes or checks provided in the original technical reference.
1. Monarch Escalator Fault Code List
The following table summarizes the six fault codes covered in this guide.
|
Fault Code |
Fault Description |
| Err1 | Overspeed at 1.2 Times Rated Speed |
| Err2 | Overspeed at 1.4 Times Rated Speed |
| Err3 | Uncommanded Reverse Direction |
| Err4 | Excessive Stopping Distance |
| Err5 | Left Handrail Underspeed |
| Err6 | Right Handrail Underspeed |
2. Detailed Explanation of Monarch Escalator Fault Codes
Err1 – Overspeed at 1.2 Times Rated Speed
Fault Description:
During normal operation, the escalator running speed exceeds 1.2 times its nominal speed.
Possible Cause / Check:
If Err1 occurs during commissioning or debugging, check whether the parameters in Group F0 have been set incorrectly.
Err2 – Overspeed at 1.4 Times Rated Speed
Fault Description:
During normal operation, the escalator running speed exceeds 1.4 times its nominal speed.
Possible Cause / Check:
If this fault occurs during commissioning or debugging, check whether the Group F0 parameter settings are abnormal.
Err3 – Uncommanded Reverse Direction
Fault Description:
The escalator step speed or running direction is detected as reversing without a corresponding command.
Possible Cause / Check:
If this fault occurs during commissioning, check whether the step speed detection signals at terminals X15 and X16 are connected in reverse.
Err4 – Excessive Stopping Distance
Fault Description:
The escalator stopping distance exceeds the specified standard requirement.
Possible Cause / Check:
If this fault occurs during commissioning or debugging, check whether the Group F0 parameter settings are abnormal.
Err5 – Left Handrail Underspeed
Fault Description:
The left handrail speed is lower than the required speed.
Possible Causes / Checks:
Incorrect Group F0 parameter settings.
Abnormal sensor signals.
Err6 – Right Handrail Underspeed
Fault Description:
The right handrail speed is lower than the required speed.
Possible Causes / Checks:
Incorrect Group F0 parameter settings.
Abnormal sensor signals.
3. Important Checks When Troubleshooting Monarch Escalator Faults
When investigating the above fault codes, the original technical reference identifies several areas that may require attention:
Group F0 parameters: Check the parameter settings when Err1, Err2, or Err4 occurs during commissioning.
Speed detection wiring: For Err3, check the connection of the X15 and X16 step speed detection signals.
Handrail speed sensors: For Err5 and Err6, check the corresponding sensor signals.
Left and right handrail monitoring: Identify which side is reporting an underspeed condition before proceeding with further inspection.
The specific inspection and repair procedures should be determined according to the actual controller configuration and applicable technical documentation.
Conclusion
Monarch escalator fault codes Err1–Err6 cover overspeed, uncommanded reverse direction, excessive stopping distance, and handrail underspeed conditions.
Understanding the meaning of each code and identifying the relevant parameter settings, wiring connections, or sensor signals can help maintenance professionals narrow down the area requiring inspection.
For accurate troubleshooting, always refer to the technical documentation applicable to the specific escalator controller and installation.
Post time: Nov-11-2026