E17
Crystal Quest
Communication bus fault
Display shows E17 and unit indicates communication error between display and main valve (on split systems).
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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 Crystal Quest display module and valve head, Damaged communication harness, Incompatible firmware versions, Failed communication driver on PCB
How to Fix / Troubleshooting
Safety first: Unplug all power sources before handling cables.
- Inspect cable: Trace the communication cable between the display and valve head. Ensure both ends are fully seated and the cable is not pinched or cut.
- Power cycle: Disconnect power for 1 minute, then reconnect. Observe if E17 clears.
- Swap cable: If available, test with a known-good Crystal Quest communication cable.
- Module replacement: If the error persists, either the display module or main control board is faulty. Replace the suspect module one at a time, starting with the display, then the main board if needed.
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Repair Difficulty
Medium
3/5
Required Part
Crystal Quest communication cable
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