AL13
SDMO
Mains Sensing Circuit Fault
Generator stops and controller displays AL13 indicating mains failure detection fault.
Advertisements
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.
Advertisements
Possible Causes
Blown fuses on SDMO mains sensing lines, Faulty voltage sensing transformer, Loose wiring between ATS and controller, Incorrect mains voltage configuration in controller
How to Fix / Troubleshooting
Safety first: Isolate both generator and mains supplies before opening any panels. Only qualified personnel should work on mains circuits.
- Check mains sensing fuses: In the SDMO control panel, locate and test the fuses protecting the mains voltage sensing inputs. Replace any blown fuses with the correct rating.
- Inspect wiring: Verify tight connections on the terminals from the ATS/mains to the SDMO controller voltage sensing inputs. Look for discoloration or overheating.
- Test voltage transformer (if fitted): Measure primary and secondary voltages to confirm correct operation. Replace the transformer if secondary output is missing or unstable.
- Verify controller settings: Ensure the SDMO controller is configured for the correct mains voltage and phase (e.g., 400 V 3-phase). Incorrect settings can cause AL13.
- Reset alarm: After corrections, clear AL13 and simulate a mains failure to confirm proper detection.
Advertisements
Repair Difficulty
Hard
4/5
Required Part
Mains Voltage Sensing Transformer
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements