E19
Bryant
Heat Pump Defrost / Outdoor Sensor Fault (Reported to Thermostat)
Thermostat shows E19 and indicates a defrost or outdoor temperature-related fault from the heat pump.
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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
Failed defrost sensor on Bryant heat pump, Faulty outdoor coil temperature sensor, Defrost control board malfunction, Wiring issue between outdoor sensors and control board
How to Fix / Troubleshooting
Safety first: Turn off power to the outdoor heat pump at the disconnect and breaker before opening panels.
Steps to troubleshoot:
- 1. Visual inspection: Remove the service panel and inspect the defrost sensor and outdoor coil sensor wiring for damage or disconnection.
- 2. Check sensor mounting: Ensure sensors are properly clipped to the coil or located as specified by Bryant, not hanging loose.
- 3. Replace suspect sensors: If a sensor is corroded, broken, or out of place, replace it with a Bryant-approved sensor.
- 4. Professional testing: A technician should test sensor resistance vs. temperature and verify defrost control board operation. Replace the defrost board if it fails diagnostics.
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Repair Difficulty
Professional Required
5/5
Required Part
Bryant Heat Pump Defrost Sensor
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