The controller shows E13, and pump speed is limited; the alarm is often logged as 'Overtemperature – Heatsink'.

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Blocked cooling vents on the controller, failed cooling fan in the inverter, high ambient temperature in the plant room, controller mounted in an unventilated enclosure

How to Fix / Troubleshooting

Safety: Isolate power before removing covers.

Clean vents: Vacuum dust from the Certikin inverter/controller cooling slots and ensure there is at least the recommended clearance around the unit.
Check cooling fan: If fitted, confirm the internal fan runs when the pump is operating. Replace if seized or noisy.
Improve ventilation: Provide additional ventilation or forced air in the plant room if temperatures are high, especially in summer.
Reduce load temporarily: Run the pump at a lower speed until permanent cooling improvements are made.

Persistent E13 faults after cleaning and fan replacement indicate a failing inverter module that may need replacement.

Repair Difficulty

Hard 4/5

Required Part

Certikin Inverter Cooling Fan

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