⚠
warning Upgraded
Error Code OT
Over Temperature alarm — the controller's heat sink temperature has exceeded 90°C (194°F).
? What Causes This
Excessive ambient temperature, poor ventilation around controller, or sustained high charging current in hot environment.
✓ How to Fix It
- Ensure adequate ventilation around the controller.
- Allow the unit to cool by reducing charging load or stopping solar input.
- Relocate controller to a cooler location if possible.
- Check that ambient temperature is within operating range (0°C to +45°C).
- If problem persists, reduce system load or upgrade to larger heat sink.
Source: page 45 of the official manual
From the manual
This error code appears in:
Upgraded 30A Solar Charge Controller