E6
Bryant
Heat Pump Configuration or Communication Fault
Thermostat displays E6 and will not allow heat pump operation or shows limited heat pump options.
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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 equipment configuration in Bryant smart thermostat setup, Missing or miswired Y/Y2 or O/B communication to heat pump, Incompatible outdoor unit with Evolution/Connex thermostat, Faulty heat pump control board communication circuit
How to Fix / Troubleshooting
Safety first: Turn off power to indoor and outdoor units at the breakers before changing wiring.
Steps to troubleshoot:
- 1. Verify equipment type in setup: Enter the thermostat’s installer or advanced setup menu and confirm that the system type is correctly set to heat pump with the proper number of stages and accessories.
- 2. Check low-voltage wiring: Confirm that the heat pump reversing valve (O/B), compressor (Y/Y2), and common (C) are correctly wired at the indoor control board and outdoor unit. Tighten any loose connections.
- 3. Confirm Bryant compatibility: Ensure the outdoor heat pump is a Bryant Evolution/Connex-compatible model if using a communicating thermostat. Non-communicating units may require a different thermostat or control strategy.
- 4. Power cycle system: After correcting configuration or wiring, shut off power for 2–3 minutes, then restore and check if E6 clears.
- 5. Professional service: If E6 persists with correct configuration and wiring, a technician should test the outdoor control board and communication circuits.
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Repair Difficulty
Hard
4/5
Required Part
Bryant Heat Pump Control Board
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