Unit frequently cycles on and off in short intervals (short cycling).

Safety first: Turn off power before adjusting internal controls.

• Check flow stability: Ensure the pool pump runs continuously during heating and that valves are not partially closing due to automation.
• Verify temperature setpoint: Avoid setting the temperature very close to current water temperature; increase the differential if possible.
• Inspect sensors: Confirm that inlet and outlet sensors are properly installed and not exposed to ambient air.
• Review control settings: In advanced controllers, adjust anti‑short‑cycle timers or hysteresis according to the Hewalex manual.