E13
U.S. Motors
External Control Input Fault
U.S. Motors pool pump controller displays E13 and ignores external automation commands.
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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
Shorted or miswired RS-485 automation cable, Incorrect polarity on communication terminals, External controller sending unsupported commands, Surge damage on communication port
How to Fix / Troubleshooting
Safety first: Turn off power to both the pump and any connected automation system before working on low-voltage wiring.
- Isolate the pump: Disconnect the RS-485 or external control wires from the U.S. Motors pump control terminals. Power the pump and see if E13 clears and local control works.
- Inspect cable and terminations: Check the automation cable for damage and verify correct polarity and terminal labeling per both the pump and automation manuals.
- Test with new cable: Temporarily run a short, known-good twisted pair cable between the automation panel and pump to rule out cable faults.
- Check automation configuration: Ensure the external controller is configured for the correct pump model/protocol and address.
- Replace control board if needed: If E13 persists with no external wiring connected, the communication interface on the pump control board may be damaged and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Pump Control Board / Communication Interface
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