Chemical dispenser communication or output error; display shows E9 and detergent/rinse aid is not dispensed.
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Disconnect power. Wear gloves and eye protection when handling detergents and rinse aids.
Step-by-step checks:
- Verify chemical supply: Ensure detergent and rinse aid containers are not empty and pickup tubes are fully submerged.
- Inspect tubing: Check chemical tubing for kinks, cracks, or air leaks. Replace brittle or damaged tubing.
- Test pump operation: Many CMA machines have a test or prime function. After restoring power, use the test mode to energize each chemical pump. If a pump does not run, power back OFF and test the pump coil for continuity. Replace failed pumps.
- Check wiring and connectors: Inspect the harness from the control board to each chemical pump. Reseat connectors and repair any damaged wires.
When to call a technician: If the control board is not sending power to the pumps despite good wiring and pumps, a board-level fault likely requires professional service.
Repair Difficulty
Required Part
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