E18
Bryant
Low-Temperature / Freeze Protection Fault (Reported to Thermostat)
Thermostat displays E18 and indicates a low-temperature or freeze protection fault; cooling may be disabled.
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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
Evaporator coil freeze detected by indoor unit sensor, Extremely low indoor temperature, Low refrigerant charge causing coil icing, Restricted airflow across evaporator coil
How to Fix / Troubleshooting
Safety first: Turn off power to the HVAC system at the breaker before inspecting indoor components. Do not attempt refrigerant work unless licensed.
Steps to troubleshoot:
- 1. Inspect air filter: Replace a dirty or clogged filter to restore airflow.
- 2. Check vents and doors: Ensure all supply and return vents are open and interior doors are not excessively restricting airflow.
- 3. Allow coil to thaw: If you suspect a frozen coil (ice on refrigerant lines or air handler), turn the system OFF and set the fan to ON for several hours to melt ice.
- 4. Restart system: After thawing and correcting airflow, restore normal cooling and monitor operation. If E18 returns, a technician should check refrigerant charge and coil condition.
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Repair Difficulty
Hard
4/5
Required Part
Bryant Evaporator Coil Temperature Sensor
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