E11
Certikin
Control Supply Undervoltage
Controller shows E11 and the display backlight flickers; pump may start and stop intermittently.
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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.
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Possible Causes
Loose neutral connection, undersized transformer in control panel, excessive voltage drop on long cable run, failing power supply board in controller
How to Fix / Troubleshooting
Safety: Isolate the control panel before opening.
- Measure control voltage: Check the low‑voltage supply feeding the Certikin controller (e.g. 24 V AC/DC). Ensure it is within tolerance under load.
- Inspect terminals: Tighten all neutral and live connections to the controller and any auxiliary transformers.
- Check cable length: For remote‑mounted controllers, verify that cable size is adequate for the run length to prevent voltage drop.
- Replace power board: If the incoming voltage is stable but the controller still reports undervoltage, the internal power supply board may be defective and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Certikin controller power supply board
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