Active temperature management

• The controller temperature is high. To protect itself, the controller automatically reduces the pump speed/power. If the temperature continues to rise, the controller may shut down completely.

• If the controller is facing direct sunlight, move it to a shaded area. This will help reduce the internal temperature.

• The pump will resume normal operation once the controller cools down.

Controller is too hot

• The controller temperature is too high.

• If the controller is facing direct sunlight, move it to a shaded area. This will help reduce the internal temperature.

• The pump will resume normal operation once the controller cools down.

Daily water amount reached

• The set daily water amount has been reached. The pump will remain off until the next scheduled switch time.

• Check the daily water amount setting in the app. If needed, increase the set amount or deactivate the function.

• The pump will start operating again as normal at the next switch time or once the function is adjusted.

Dry run protection switch

• The Dry Run Protection accessory is installed and has detected the pump is running dry.

• Check that the pump is fully submerged and confirm that the water level in the well is actually below the sensor. If so, the Dry Run Protection has operated correctly.
• Make sure the accessory is installed properly.

• Once the water level rises above the accessory, the pump will restart automatically after 15 minutes.

• There is no Dry Run Protection accessory or "jumper plug₍₁₎" connected, but the app shows the event. “Dry run protection switch”.

• Open S-Connect App → Advanced Settings → Check if the option "Dry Run Protection Switch" is active. If yes, deactivate it, otherwise install a Dry Run Protection accessory or a jumper plug on the S1 controller.

• Pump will remain stopped until the option "Dry Run Protection Switch" in the app is deactivated.

• The Dry Run Protection accessory is not working.

• Verify that the accessory is not physically damaged or has not been exposed to lightning. Test with a new Dry Run Protection accessory or a jumper plug.

• Contact your distributor to replace the damaged Dry Run Protection accessory and extension cable.
• If the Dry Run Protection is not damaged, the accessory will work properly once the accessory installation and pump settings have been corrected.

• Check that the plugs are properly connected and clean. Ensure there is no dirt or water inside any plug (including extension cables, refer also to the "Extension Cable Manual").

• Verify that the Dry Run Protection accessory is correctly activated. Follow the steps to activate the accessory (described on the linked webpage) either using the S-Connect App or manually without using the App.

• Verify correct installation and positioning of the Dry Run Protection accessory in water. Check the actual water level. Refer to the "Dry Run Protection accessory manual".

• If an accessory extension cable is used, remove the extension cable and connect the Dry Run Protection accessory directly to the controller. Check all plugs and clean if necessary.

• The controller input might be damaged. Replace the accessory with a jumper plug. If the issue persists, the controller input is likely damaged.

Input voltage is too high

• The controller has stopped the pump because it has detected that the input voltage is too high.

• Check that the total output voltage (Voc) of the connected PV modules does not exceed the maximum input voltage allowed by the controller:
  • For S1-200, the limit is 55 V
  • For S1-700, the limit is 220 V
• If the voltage is too high, you will need to reconfigure the PV generator (e.g., reduce the number of panels in series) to ensure the output voltage stays within the acceptable range. See the following articles for "S1-200" and "S1-700".

• If the overvoltage condition persists, the controller may be permanently damaged. If this happens, the controller must be replaced. Please contact your distributor.

Low power 1, 2

• The controller can’t start due to insufficient solar irradiance.

• This is a normal condition during early morning, late afternoon, or low irradiance.

• The controller will retry every 2 minutes automatically. You can also restart it manually by toggling the switch off and on

• The controller can´t start although the solar irradiance is sufficient.

• Blocked pump end:
  • For S1-200: Remove the pump end. Clean the rotor and pump end inside, do not apply grease! (Cleaning instructions here).
  • For S1-700: Remove and clean the filter on the pump inlet.

• Blocked or kniked pipe/hose:
  Check the entire pipeline for obstructions or kinks.

• Wrong pump end temperature class:
  • For S1-200: Check if the temperature class of your pump matches the water temperature (refer here for more information). Ensure the pump end is not directly exposed to sunlight. If the issue continues, replace the pump end and choose one higher temperature class.
  • For S1-700: Make sure the water temperature does not exceed 50 °C [122 °F].

• Shaded, dirty, incorrectly wired, incorrectly placed or undersized PV modules:
  • Make sure the PV modules are unshaded and receive direct sunlight.
  • Clean the modules according to the manufacturer's guidelines.
  • Check all connections to ensure they are secure.
  • Verify the PV array meets the voltage requirements.
    • For S1-200: [See minimum voltage]
    • For S1-700:[See minimum voltage]

• A Remote Tank Full Switch accessory is installed, but the "Low power 2" event prompts before the controller identifies a full tank.

• If a Remote Tank Switch is installed and the system operates at a low total dynamic head (TDH) compared to the maximum head of the pump (see datasheet "S1-200" or "S1-700"), the pump might stop with a "Low power" error due to the closed float valve before the controller starts to evaluate the "Remote Tank Switch" event. To resolve this, reduce the default value for the “Start-up time” in the S-Connect app: Go to Settings → Advanced Settings → Tank Switch → Remote Tank Switch → adjust the Start-up time to a lower value. (Refer also to the "Remote Tank Switch" event)

Low power 3, 4

• The controller can’t start due to insufficient solar irradiance.

• This is a normal condition during early morning, late afternoon, or low irradiance.

• The controller will retry every 2 minutes automatically. You can also restart it manually by toggling the switch off and on.

Motor cable problem 1, 2 or 3

• The motor cable might be damaged.

• Check if the motor cable shows any visible signs of damage.

• If the cable is damaged, it must be replaced. Please contact your distributor.

• The plug connections might be dirty or wet.

• Make sure there is no dirt or water inside any plug, including extension cables. Refer to the manuals for further guidance:
  • S1-200 Motor Extension Cable
  • S1-700 Motor Extension Cable

• If the plugs were dirty or wet, ensure they are clean and dry before reconnecting the photovoltaic power supply and turning on the controller. If the problem persists, contact your distributor.

Pump overload

• This error occurs when there is sufficient power from the PV array, but the controller is unable to start the pump.

• Check whether the hose is blocked or kinked (inspect the entire hydraulic system).
• Check whether the pump end is damaged or blocked.
• Check the water temperature and make sure it does not exceed the allowed maximum temperature for the pump end temperature class (applies to HRE-pumps).
• Check the motor.
• Check the motor cable and motor extension cables for visible damages.

• The controller will retry every 2 minutes automatically. You can also restart it manually by toggling the switch off and on.

Remote tank switch

• The Remote Tank Switch accessory is installed and has detected a full tank. A float valve installed at the tank, located at the end of the discharge line, has closed.

• Check the water level and confirm the tank is actually full.
• Check that the float valve is installed correctly at the tank and that it is effectively closed.

• The RTS monitors the water flow in the hose (or pipe) and, based on this, sends signals to the controller to run or stop the pump. The controller performs periodic starts every 15 minutes (or according to the Retry Time value set in the app) to check the water flow. When the tank is no longer full, the float valve opens and the pump restarts automatically.

Sensor Error Remote Tank Switch

• The Remote Tank Switch accessory is clogged or damaged.

• Inspect the Remote Tank Switch for clogging. Follow the inspection and cleaning steps described on the linked webpage and check for damage.

• If the Remote Tank Switch is not damaged, it will work properly once it has been cleaned and reinstalled.
• If it is damaged, contact your authorized distributor to replace the Remote Tank Switch.

Tank full switch

• The Tank Full Switch accessory is installed and has detected a full tank

• Check water level and confirm tank is actually full.
• Make sure the accessory is installed properly.

• Pump will restart automatically once tank is no longer full.

• There is no Tank Full Switch accessory or "jumper plug₍₁₎" connected, but the app shows the event “Tank full switch”.

• Open S-Connect App → Advanced Settings → Check if the option "Tank Switch" is active. If yes, deactivate it, otherwise install a Tank Full Switch accessory or a jumper plug on the S1 controller.

• Pump will remain stopped until the option "Tank Switch" in the app is deactivated.

• The Tank Full Switch accessory is not working.

• Verify that the accessory is not physically damaged or has not been exposed to lightning. Test with a new Tank Full Switch accessory or a jumper plug.

• Contact your distributor to replace the damaged Tank Full Switch accessory and extension cable.
• If the Tank Full Switch is not damaged, the accessory will work properly once the accessory installation and pump settings have been corrected.

• Check that the plugs are properly connected and clean. Ensure there is no dirt or water inside any plug (including extension cables, refer also to the "Extension Cable manual").

• Verify that the Tank Full Switch accessory is correctly activated. Follow the steps to activate the accessory (described on the linked webpage) either using the S-Connect App or manually without using the App.

• Verify correct installation and positioning of the Tank Full Switch in water. Check the actual water level. Refer to the "Tank Full Switch manual".

• If an accessory extension cable is used, remove the extension cable and connect the Tank Full Switch accessory directly to the controller. Check all plugs and clean if necessary.

• The controller input might be damaged. Replace the accessory with a jumper plug. If the issue persists, the controller input is likely damaged.

Timer setting has stopped pump

• The timer function in the S-Connect app has stopped the pump. This function can be activated to run the pump only during specific time intervals. During the programmed "stop/pause time," the pump remains off.

• Wait until the programmed "stop/pause time" ends, or go to the S-Connect app and adjust the timer settings as needed. You can either change the start/stop times or deactivate the timer entirely.

• The pump will start operating again once the "stop/pause time" ends or the timer is deactivated.