Why is the RUN light flashing on the STERWINS 1100 JET INAUTO-4 automatic pump and how can I resolve this issue?

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The RUN light (Pump activated) flashing on your STERWINS 1100 JET INAUTO-4 automatic pump indicates intermittent operation or repeated automatic shutdown. This flashing signals that the control system detects a problem and stops the pump to protect it. Here are the most likely causes and corresponding solutions:

Motor overheating: Your pump is equipped with a built-in thermostat that automatically stops the motor in case of overheating, which causes the RUN light to flash. The pump restarts automatically after cooling down. To prevent this, ensure that the suction hose is always submerged in water. Running dry (without water) causes rapid overheating and repeated motor shutdown.

Water temperature too high: This pump can only handle water with a maximum temperature of 35°C. If the temperature exceeds this threshold, the thermostat automatically shuts off the pump. Check that the water source is not exposed to intense sunlight or excessive heat, especially in summer.

Dirty or clogged filters: The built-in suction filter can become dirty and limit water flow. Stop the pump, unplug it, then inspect and clean the suction filter. A dirty filter reduces performance and can cause intermittent shutdowns. Regularly clean this filter for optimal operation.

Faulty check valve: The check valve may be dirty or damaged, preventing proper water circulation. Clean the check valve or replace it if cleaning is insufficient.

Excessive suction height: The maximum suction height of this pump is 8 meters. If the water level is lower, the pump cannot suction properly and stops regularly. Move the pump closer to the water source or lower it to meet this limit. Also, ensure that the suction hose does not contain air: fill the pump head with water before starting.

Restart after resolution: Once the problem is identified and resolved, press the restart button (Reset) on the pressure control unit to restart the pump. If the light flashes immediately after restarting, the problem persists.

If after these checks the RUN light continues to flash, stop using it and contact an authorized STERWINS service center or your dealer for a thorough diagnosis and professional repair.

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