Solar heating turns on and off rapidly (short cycling) even under steady sunny conditions.

Safety first: Turn off power before adjusting sensors or wiring. Use safe roof access.

• Relocate sensor if needed: Position the solar sensor on a header where it senses average panel temperature, not directly at the outlet where temperature fluctuates rapidly.
• Improve contact: Secure the sensor firmly to the header with UV-resistant ties and ensure it is not exposed to wind cooling.
• Increase differential: Raise the solar-on and solar-off differentials slightly to prevent rapid cycling.
• Secure wiring: Tighten sensor terminals and repair any damaged cable to prevent intermittent signals.