E6
Senville
Indoor-Outdoor Communication Error (Alternate Code)
Indoor unit shows E6; outdoor unit may not respond; system does not cool or heat.
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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
Incorrect wiring between indoor and outdoor units, Broken communication conductor in interconnect cable, Electrical noise or interference on communication line, Faulty indoor or outdoor PCB communication circuit
How to Fix / Troubleshooting
Safety: Turn off all power to the system before working on wiring.
- Step 1 – Verify wiring diagram: Compare the actual wiring between indoor and outdoor units to the Senville installation manual. Ensure terminals (e.g., 1-2-3 or L-N-S) are correctly matched.
- Step 2 – Tighten terminals: At both indoor and outdoor terminal blocks, tighten all screws. Loose terminals can cause intermittent E6 errors.
- Step 3 – Inspect cable type: Ensure the interconnect cable is the recommended gauge and type (e.g., stranded copper, correct number of conductors). Replace undersized or damaged cable.
- Step 4 – Check for interference: Avoid running the communication cable parallel and close to high-voltage lines. If necessary, reroute or shield the cable.
- Step 5 – Board swap (advanced): If wiring is correct and cable is good, one of the PCBs may have a failed communication circuit. This requires board testing or substitution by a technician.
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Repair Difficulty
Hard
4/5
Required Part
Interconnect Communication Cable
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