E12
Calpeda
Communication Error (Modbus / External Control)
Display shows E12 and pump cannot be controlled from external automation
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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
Broken communication cable between Calpeda pump controller and automation system, Incorrect Modbus address or baud rate in Calpeda controller, Reversed polarity on RS-485 terminals, Electrical noise interference on communication line
How to Fix / Troubleshooting
Safety first: Turn off power to the control circuits before rewiring communication lines.
- Check physical connections: Inspect the RS-485 or other communication terminals on the Calpeda controller. Ensure A/B (or +/−) wires are correctly landed and firmly tightened.
- Verify cable integrity: Use a continuity tester to check the communication cable for breaks or shorts. Replace damaged cable with twisted-pair, shielded cable as recommended by Calpeda.
- Confirm settings: In both the Calpeda controller and the external automation system, verify that baud rate, parity, stop bits, and device address match exactly.
- Check termination: Ensure that termination resistors are installed only at the ends of the RS-485 bus, not at every device. Incorrect termination can cause E12 errors.
- Reduce interference: Route communication cables away from high-voltage and motor cables. Use shielded cable and connect the shield to ground at one end only.
- Reset communication module: Power-cycle the controller and automation system after corrections. Clear the E12 error and test remote control.
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Repair Difficulty
Medium
3/5
Required Part
Calpeda pump controller communication module
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