Basic Repair and Troubleshooting for Automatic Sliding Doors
Initial Service Call Checklist
Before performing repairs, complete the following basic checks:
Visual and Functional Inspection
- Look for visible damage or obstructions.
- Listen for unusual noises.
- Check for burning smells or signs of overheating.
Verify Power
- Confirm all power sources are active.
- Verify breakers and disconnects are on.
- Confirm the system is receiving power.
Isolate the System
- Determine whether the issue is mechanical, electrical, or related to sensors/accessories.
Additional Checks
- Ensure the On / Off / Hold Open (H.O.) switch is turned on.
- If all basic checks pass, proceed to the mechanical troubleshooting steps.
Mechanical Troubleshooting
Step 1: Can the Door Be Opened and Closed Manually With Normal Effort?
YES
Check for:
- Broken drive belt
- Failed coupler
- Damaged drive mechanism
NO
Proceed to Step 2.
Step 2: Are the Door Panels Broken Out?
YES
- Repair or reset the breakout mechanism.
- Continue to electrical troubleshooting after repairs.
NO
Proceed to Step 3.
Step 3: Check for Track Binding
Inspect:
- Top track
- Bottom track
Binding Found
- Repair track alignment or remove obstructions.
- Verify smooth door movement.
No Binding Found
- Continue to electrical troubleshooting.
Electrical Troubleshooting
Step 1: Verify Power and Operating Mode
Confirm:
- Power is present.
- The On / Off / Hold Open switch is set to Auto.
Step 2: Check for a Blown Fuse
Fuse Blown
- Replace the fuse.
- Retest door operation.
Fuse Not Blown
Proceed to Step 3.
Step 3: Verify the Auto Switch
Switch Faulty
Possible cause:
- Defective On / Off / Hold Open switch
Replace or repair the switch.
Switch Operating Properly
Proceed to Step 4.
Step 4: Disconnect Activation Devices
Disconnect all activation devices and attempt to activate the door directly from the control.
Door Does Not Open
Possible causes:
- Faulty control board
- Motor or gearbox failure
- Breakout circuit issue
Door Opens
Proceed to Step 5.
Step 5: Does the Door Time Out and Close?
YES
Possible cause:
- Faulty activation device
Inspect:
- Motion sensors
- Push plates
- Presence sensors
- Access control devices
NO
Possible cause:
- Faulty safety device
Inspect:
- Safety sensors
- Threshold sensors
- Presence detection devices
Important Note
When disconnecting an activation device or safety device, you may need to install a jumper if the circuit is normally closed (N.C.). This will allow the door to operate during testing and troubleshooting.
Common Causes of Automatic Sliding Door Failure
Mechanical Issues
- Track binding
- Broken drive belt
- Failed coupler
- Damaged drive mechanism
- Breakout system problems
Electrical Issues
- Blown fuse
- Faulty control board
- Defective auto switch
- Motor or gearbox failure
Sensor and Activation Issues
- Faulty motion sensors
- Failed push plates
- Defective safety sensors
- Wiring issues in activation circuits