E15
Waterguy
Internal Communication / Bus Error
E15 displayed and unit reports communication error between display and main board
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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 display and control board, Oxidized connectors, Faulty display module, Faulty main control PCB
How to Fix / Troubleshooting
Safety first: Unplug the softener before servicing electronics.
- Open control housing: Remove the front cover to access the display and main board.
- Reseat connectors: Unplug and replug the communication harness between the display module and the main board. Inspect for bent pins or corrosion.
- Visual inspection: Look for burn marks or damaged components on either board.
- Power cycle: Reassemble, restore power, and see if E15 clears.
If E15 persists, either the display module or the main control board must be replaced. It is often cost-effective to replace the entire control assembly.
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Repair Difficulty
Medium
3/5
Required Part
Waterguy Display / Control Board Assembly
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