Bryant
Bryant Smart Thermostats Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E1
Thermostat displays E1 and will not communicate with the indoor unit; no temperature or system status updates.
Indoor Unit Communication Fault
E10
Thermostat displays E10 and Wi‑Fi or cloud connectivity features are unavailable.
Wi‑Fi Module or Network Fault
E11
Thermostat shows E11 and mobile app cannot connect or control the thermostat remotely.
Cloud Service or Account Linking Fault
E12
Thermostat displays E12 and shows a low-voltage or power supply error; screen may dim or reboot intermittently.
Thermostat Power / C-Wire Fault
E13
Thermostat shows E13 and indicates an internal memory or configuration error; settings may reset unexpectedly.
Thermostat Internal Memory / Firmware Fault
E14
Thermostat displays E14 and indicates a sensor calibration or range error; temperature or humidity readings may be locked.
Sensor Calibration Fault
E15
Thermostat shows E15 and indicates a remote sensor fault; remote room temperature or humidity readings are unavailable.
Remote Sensor Communication Fault
E16
Thermostat displays E16 and indicates an indoor airflow or fan feedback error; system may shut down or limit operation.
Indoor Fan / Airflow Feedback Fault (Reported to Thermostat)
E17
Thermostat shows E17 and indicates a high-temperature or safety lockout reported from the indoor unit.
High-Temperature / Limit Switch Lockout (Reported to Thermostat)
E18
Thermostat displays E18 and indicates a low-temperature or freeze protection fault; cooling may be disabled.
Low-Temperature / Freeze Protection Fault (Reported to Thermostat)
E19
Thermostat shows E19 and indicates a defrost or outdoor temperature-related fault from the heat pump.
Heat Pump Defrost / Outdoor Sensor Fault (Reported to Thermostat)
E2
Thermostat displays E2 and system will not respond to heating or cooling commands.
Outdoor Unit Communication Fault
E20
Thermostat displays E20 and indicates an indoor air quality (IAQ) accessory fault; air purifier or UV light control may be disabled.
IAQ Accessory Control Fault
E3
Thermostat shows E3 and indoor temperature reading is obviously wrong (e.g., displays 120°F in a normal room).
Internal Room Temperature Sensor Fault
E4
Thermostat displays E4 and will not allow cooling operation; cooling icon may be disabled.
Outdoor Temperature Sensor Fault
E5
Thermostat shows E5 and system may shut down or run in limited mode; humidity control may be disabled.
Indoor Humidity Sensor Fault
E6
Thermostat displays E6 and will not allow heat pump operation or shows limited heat pump options.
Heat Pump Configuration or Communication Fault
E7
Thermostat shows E7 and auxiliary heat or furnace operation is disabled or limited.
Auxiliary Heat / Furnace Communication Fault
E8
Thermostat displays E8 and ventilation or ERV/HRV functions are disabled.
Ventilation Device Communication or Control Fault
E9
Thermostat shows E9 and dehumidification or whole-home dehumidifier control is disabled.
Dehumidifier Communication or Control Fault
Symptom
Bryant mobile app cannot find or pair with the thermostat during setup.
Initial Pairing / Registration Failure
Symptom
Thermostat backlight or display is very dim and hard to read, even though the unit otherwise works.
Display Backlight Degradation
Symptom
Thermostat calls for cooling (display indicates COOL ON) but outdoor unit does not start.
Cooling Call Not Reaching Outdoor Unit
Symptom
Thermostat display is on but unresponsive or frozen; touch inputs or buttons do not work.
Thermostat Interface Lockup
Symptom
Thermostat does not call for cooling even when set below room temperature; indoor temperature rises.
No Cooling Call from Thermostat
Symptom
Thermostat does not call for heat even when set above room temperature; furnace or heat pump remains off.
No Heating Call from Thermostat
Symptom
Thermostat emits unusual buzzing or clicking noises from the wall unit itself.
Thermostat Relay or Electronics Noise
Symptom
Thermostat fan setting is ON or CIRCULATE, but the indoor blower does not run.
Fan-Only Command Not Activating Blower
Symptom
Thermostat frequently overshoots the set temperature, causing rooms to become too hot or too cold before shutting off.
Improper Cycle Rate / Anticipation Settings
Symptom
Thermostat frequently reboots or flickers when heating or cooling starts.
Voltage Drop / Power Instability at Thermostat
Symptom
Thermostat indicates dehumidification is active, but indoor humidity does not decrease.
Dehumidification Control Ineffective
Symptom
Thermostat indicates humidification is active, but indoor humidity does not increase in winter.
Humidifier Control Ineffective
Symptom
Thermostat is completely blank or dead; no display and no response to button presses.
No Power to Thermostat
Symptom
Thermostat language, time, or date settings will not save or revert after power loss.
Non-Volatile Settings Storage Failure
Symptom
Thermostat loses Wi‑Fi connection intermittently; remote control via app is unreliable.
Intermittent Wi‑Fi Connectivity
Symptom
Thermostat randomly changes temperature setpoints or mode without user input.
Unintended Schedule or Remote Control Changes
Symptom
Thermostat shows humidity far higher or lower than actual; dehumidification or humidification behaves erratically.
Inaccurate Humidity Sensing
Symptom
Thermostat shows incorrect room temperature compared to actual conditions; system short cycles or runs too long.
Inaccurate Room Temperature Sensing
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Thermostat displays E1 and will not communicate with the indoor unit; no temperature or system status updates.
|
Indoor Unit Communication Fault | View Details |
| E10 |
Thermostat displays E10 and Wi‑Fi or cloud connectivity features are unavailable.
|
Wi‑Fi Module or Network Fault | View Details |
| E11 |
Thermostat shows E11 and mobile app cannot connect or control the thermostat remotely.
|
Cloud Service or Account Linking Fault | View Details |
| E12 |
Thermostat displays E12 and shows a low-voltage or power supply error; screen may dim or reboot intermittently.
|
Thermostat Power / C-Wire Fault | View Details |
| E13 |
Thermostat shows E13 and indicates an internal memory or configuration error; settings may reset unexpectedly.
|
Thermostat Internal Memory / Firmware Fault | View Details |
| E14 |
Thermostat displays E14 and indicates a sensor calibration or range error; temperature or humidity readings may be locked.
|
Sensor Calibration Fault | View Details |
| E15 |
Thermostat shows E15 and indicates a remote sensor fault; remote room temperature or humidity readings are unavailable.
|
Remote Sensor Communication Fault | View Details |
| E16 |
Thermostat displays E16 and indicates an indoor airflow or fan feedback error; system may shut down or limit operation.
|
Indoor Fan / Airflow Feedback Fault (Reported to Thermostat) | View Details |
| E17 |
Thermostat shows E17 and indicates a high-temperature or safety lockout reported from the indoor unit.
|
High-Temperature / Limit Switch Lockout (Reported to Thermostat) | View Details |
| E18 |
Thermostat displays E18 and indicates a low-temperature or freeze protection fault; cooling may be disabled.
|
Low-Temperature / Freeze Protection Fault (Reported to Thermostat) | View Details |
| E19 |
Thermostat shows E19 and indicates a defrost or outdoor temperature-related fault from the heat pump.
|
Heat Pump Defrost / Outdoor Sensor Fault (Reported to Thermostat) | View Details |
| E2 |
Thermostat displays E2 and system will not respond to heating or cooling commands.
|
Outdoor Unit Communication Fault | View Details |
| E20 |
Thermostat displays E20 and indicates an indoor air quality (IAQ) accessory fault; air purifier or UV light control may be disabled.
|
IAQ Accessory Control Fault | View Details |
| E3 |
Thermostat shows E3 and indoor temperature reading is obviously wrong (e.g., displays 120°F in a normal room).
|
Internal Room Temperature Sensor Fault | View Details |
| E4 |
Thermostat displays E4 and will not allow cooling operation; cooling icon may be disabled.
|
Outdoor Temperature Sensor Fault | View Details |
| E5 |
Thermostat shows E5 and system may shut down or run in limited mode; humidity control may be disabled.
|
Indoor Humidity Sensor Fault | View Details |
| E6 |
Thermostat displays E6 and will not allow heat pump operation or shows limited heat pump options.
|
Heat Pump Configuration or Communication Fault | View Details |
| E7 |
Thermostat shows E7 and auxiliary heat or furnace operation is disabled or limited.
|
Auxiliary Heat / Furnace Communication Fault | View Details |
| E8 |
Thermostat displays E8 and ventilation or ERV/HRV functions are disabled.
|
Ventilation Device Communication or Control Fault | View Details |
| E9 |
Thermostat shows E9 and dehumidification or whole-home dehumidifier control is disabled.
|
Dehumidifier Communication or Control Fault | View Details |
| – |
Bryant mobile app cannot find or pair with the thermostat during setup.
|
Initial Pairing / Registration Failure | View Details |
| – |
Thermostat backlight or display is very dim and hard to read, even though the unit otherwise works.
|
Display Backlight Degradation | View Details |
| – |
Thermostat calls for cooling (display indicates COOL ON) but outdoor unit does not start.
|
Cooling Call Not Reaching Outdoor Unit | View Details |
| – |
Thermostat display is on but unresponsive or frozen; touch inputs or buttons do not work.
|
Thermostat Interface Lockup | View Details |
| – |
Thermostat does not call for cooling even when set below room temperature; indoor temperature rises.
|
No Cooling Call from Thermostat | View Details |
| – |
Thermostat does not call for heat even when set above room temperature; furnace or heat pump remains off.
|
No Heating Call from Thermostat | View Details |
| – |
Thermostat emits unusual buzzing or clicking noises from the wall unit itself.
|
Thermostat Relay or Electronics Noise | View Details |
| – |
Thermostat fan setting is ON or CIRCULATE, but the indoor blower does not run.
|
Fan-Only Command Not Activating Blower | View Details |
| – |
Thermostat frequently overshoots the set temperature, causing rooms to become too hot or too cold before shutting off.
|
Improper Cycle Rate / Anticipation Settings | View Details |
| – |
Thermostat frequently reboots or flickers when heating or cooling starts.
|
Voltage Drop / Power Instability at Thermostat | View Details |
| – |
Thermostat indicates dehumidification is active, but indoor humidity does not decrease.
|
Dehumidification Control Ineffective | View Details |
| – |
Thermostat indicates humidification is active, but indoor humidity does not increase in winter.
|
Humidifier Control Ineffective | View Details |
| – |
Thermostat is completely blank or dead; no display and no response to button presses.
|
No Power to Thermostat | View Details |
| – |
Thermostat language, time, or date settings will not save or revert after power loss.
|
Non-Volatile Settings Storage Failure | View Details |
| – |
Thermostat loses Wi‑Fi connection intermittently; remote control via app is unreliable.
|
Intermittent Wi‑Fi Connectivity | View Details |
| – |
Thermostat randomly changes temperature setpoints or mode without user input.
|
Unintended Schedule or Remote Control Changes | View Details |
| – |
Thermostat shows humidity far higher or lower than actual; dehumidification or humidification behaves erratically.
|
Inaccurate Humidity Sensing | View Details |
| – |
Thermostat shows incorrect room temperature compared to actual conditions; system short cycles or runs too long.
|
Inaccurate Room Temperature Sensing | View Details |
No matching codes found
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