E6
Tempstar
Indoor/Outdoor Mismatch or Phase Error (for some inverter models)
Tempstar air conditioner displays E6 and system shuts down shortly after starting
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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
Incorrectly matched indoor and outdoor Tempstar units, Incorrect wiring of line voltage (phase reversal on three-phase units), Faulty inverter module, Incorrect dip switch settings on control board
How to Fix / Troubleshooting
Safety first: Disconnect power at all breakers and service disconnects. Three-phase power is extremely dangerous; only qualified personnel should work on it.
Homeowner-level checks:
- 1. Confirm model match: Verify that the indoor and outdoor model numbers are part of an approved Tempstar matched system (check installation manual or manufacturer website).
- 2. Do not alter wiring: If you suspect three-phase or high-voltage wiring issues, do not attempt to swap phases or move wires yourself.
- 3. Power reset: Turn off power for 10 minutes, then restore and see if the error clears.
- 4. Call a professional: E6 typically requires checking phase rotation, inverter board diagnostics, and configuration settings using Tempstar service tools.
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Repair Difficulty
Professional Required
5/5
Required Part
Inverter Control Module
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