E12
Pahlen
Low Control Voltage / Auxiliary Power Fault
Pahlén pump controller shows E12 and the display is blank or flickering
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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
Failed low-voltage power supply on control PCB, Loose low-voltage connector, Shorted keypad or display module, Water ingress into control housing
How to Fix / Troubleshooting
Safety first: Disconnect power and wait several minutes for capacitors to discharge before opening the control housing.
- Inspect for moisture: Remove the cover and look for signs of water, condensation, or corrosion. Dry carefully and correct any sealing issues.
- Check connectors: Ensure the display/keypad ribbon cable is firmly seated on the Pahlén control board.
- Look for damage: Burn marks or swollen components on the board indicate a failed power supply section; the board will likely need replacement.
- Reassemble and test: After drying and reseating connectors, restore power and see if E12 clears and the display stabilizes.
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Repair Difficulty
Professional Required
5/5
Required Part
Keypad/Display Module
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