E18
Viadrus
Communication Error Between Control Modules
Control shows E18, burner does not start, and the display may show a communication or bus symbol.
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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 communication cable between user interface and main board, Damaged bus cable, Incorrect module addressing, Faulty display or main control module
How to Fix / Troubleshooting
Safety: Turn off power before unplugging any internal cables.
- Check display cable: Remove the front panel and inspect the low‑voltage cable between the user interface (display) and the main control board. Reseat both ends.
- Inspect for damage: Look for pinched or cut cables where they pass through metal panels. Replace damaged cables.
- Module addressing: On some Viadrus systems with external modules (e.g., pump groups), ensure DIP switches or address selectors are set according to the installation manual.
- Module replacement: If cables are intact but E18 persists, either the display module or main board may be defective. Swap with known‑good modules if available, or have a technician test and replace.
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Repair Difficulty
Hard
4/5
Required Part
User Interface / Display Module
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