C
Hormann
Direction Relay / Output Stage Fault
Display shows “C”, operator runs only in one direction
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed motor relay for one direction, Burnt PCB track, Shorted motor winding, Incorrect wiring of motor leads
How to Fix / Troubleshooting
Safety first: Isolate mains power. Only qualified persons should work on live circuits.
Step-by-step:
- Check motor wiring: Verify that the motor leads are connected to the correct terminals on the control board as per Hormann diagram. Look for burnt connectors.
- Inspect PCB: Look for obvious damage around the motor relays (burn marks, cracked solder joints). If present, the board must be replaced.
- Test motor (advanced): With the motor disconnected and using appropriate test equipment, check winding resistance. A shorted winding can destroy relays.
- Replace faulty parts: In most cases, replacing the complete control board is the practical repair. If the motor is shorted, replace the motor unit as well.
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Repair Difficulty
Professional Required
5/5
Required Part
Hormann Control Board (Motor Output Stage) or Motor Unit
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