⚠
warning Upgraded
Error Code CPF09
Heat Sink SR Open / Low Operating Temperature alarm — the operating temperature has fallen below 0°C (32°F).
? What Causes This
Ambient temperature is below 0°C, or sensor fault indicating unusually low operating temperature.
✓ How to Fix It
- Ensure the operating environment temperature is maintained above 0°C (32°F).
- Move the unit to a warmer location if necessary.
- Check for proper ventilation to allow heat dissipation.
- If temperature is confirmed above 0°C but alarm persists, the temperature sensor may be faulty and require service.
Source: page 45 of the official manual
From the manual
This error code appears in:
Upgraded 30A Solar Charge Controller