Schneider Electric
Schneider Electric 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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E01
Thermostat display shows E01 and heating/cooling outputs are disabled.
Internal Temperature Sensor Failure
E02
Thermostat shows E02 and cannot read room temperature correctly; display may show dashes or a fixed value.
Remote Room Sensor Fault
E03
E03 displayed and thermostat cannot control floor heating accurately; floor temperature reading is missing or incorrect.
Floor Sensor Failure (Hydronic or Electric Floor Heating)
E04
Thermostat shows E04 and does not energize the heating output relay.
Heating Output Relay Fault
E05
E05 displayed and cooling output does not respond to setpoint changes.
Cooling Output Relay or Triac Fault
E06
Thermostat shows E06 and cannot control humidity; humidification/dehumidification functions are disabled.
Humidity Sensor Failure
E07
E07 displayed and thermostat cannot connect to Wi‑Fi or Schneider Electric cloud services.
Wi‑Fi Module Communication Error
E08
Thermostat displays E08 and cannot join the Schneider Electric Zigbee/Z-Wave network or building automation gateway.
Radio Mesh Module Failure (Zigbee/Z-Wave)
E09
E09 displayed and thermostat reports power supply error; screen may flicker or reboot intermittently.
Low Voltage Power Supply Fault
E10
Thermostat displays E10 and indicates communication loss with HVAC equipment or zone controller.
Equipment Communication Bus Failure
E11
E11 displayed and thermostat indicates over-temperature protection; outputs are shut down.
Over-Temperature Protection Trip
E12
Thermostat displays E12 and refuses to control outputs due to a configuration error.
Configuration / Parameter Error
E13
E13 displayed and thermostat indicates date/time or schedule memory error; schedules may be lost after power cycles.
Real-Time Clock / Backup Memory Fault
E14
Thermostat displays E14 and indicates a firmware error; some functions may be disabled.
Firmware Corruption
E15
E15 displayed and thermostat indicates lockout due to repeated sensor or output faults.
Safety Lockout Condition
E16
Thermostat displays E16 and indicates an external input fault (e.g., window contact, occupancy sensor).
Digital Input / Contact Fault
E17
E17 displayed and thermostat indicates fan output fault; fan does not respond correctly.
Fan Output Driver Failure
E18
Thermostat shows E18 and indicates valve or actuator output fault in hydronic systems.
Valve / Actuator Output Failure
E19
E19 is displayed, and the thermostat indicates an internal memory or data logging error.
Non-Volatile Memory Fault
E20
The thermostat shows E20 and indicates a calibration error; temperature readings are clearly incorrect.
Sensor Calibration Out of Range
Symptom
Cooling does not start even though the thermostat is set to <strong>Cool</strong> and the room temperature is above the setpoint.
No Cooling Call from Thermostat
Symptom
The room temperature shown on the thermostat is significantly different from the actual room temperature.
Inaccurate Temperature Sensing
Symptom
The thermostat backlight or display is very dim or flickers.
Display Backlight Power Issue
Symptom
The thermostat calls for heat, but the heating system runs continuously and overshoots the setpoint.
Heating Stuck On / Overshoot
Symptom
The thermostat cannot be discovered or controlled by the Schneider Electric Building Management System (BMS).
BMS Integration / Addressing Issue
Symptom
The thermostat controls hydronic floor heating, but some zones never get warm.
Zone Control / Actuator Issue
Symptom
The thermostat display is completely blank and does not power on.
No Power to Thermostat
Symptom
The thermostat does not follow the programmed schedule; heating/cooling occurs at incorrect times.
Scheduling / Clock Issue
Symptom
The thermostat does not respond to the occupancy sensor or presence detection; it stays in one mode.
Occupancy Input or Sensor Integration Failure
Symptom
The thermostat fails to control electric underfloor heating; the floor remains cold.
Underfloor Heating Output Not Energizing
Symptom
The thermostat frequently disconnects from Wi-Fi or the Schneider Electric cloud app.
Intermittent Network Connectivity
Symptom
The thermostat or the wall area around it feels unusually warm to the touch.
Thermostat Overheating
Symptom
The thermostat powers on but does not call for heat even when the room temperature is below the setpoint.
No Heat Call from Thermostat
Symptom
The thermostat randomly reboots or restarts several times a day.
Intermittent Power or Firmware Instability
Symptom
The thermostat screen is on, but touch controls or buttons do not respond.
Unresponsive User Interface
Symptom
The thermostat shows condensation or moisture inside the display cover.
Moisture Ingress / Condensation
Symptom
Thermostat causes short-cycling: The HVAC system turns on and off very frequently.
Short Cycling Due to Control Settings or Fault
Symptom
Thermostat shows correct temperature, but HVAC equipment runs at unexpected times or in the wrong mode.
Miswiring or Crossed Outputs
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Thermostat display shows E01 and heating/cooling outputs are disabled.
|
Internal Temperature Sensor Failure | View Details |
| E02 |
Thermostat shows E02 and cannot read room temperature correctly; display may show dashes or a fixed value.
|
Remote Room Sensor Fault | View Details |
| E03 |
E03 displayed and thermostat cannot control floor heating accurately; floor temperature reading is missing or incorrect.
|
Floor Sensor Failure (Hydronic or Electric Floor Heating) | View Details |
| E04 |
Thermostat shows E04 and does not energize the heating output relay.
|
Heating Output Relay Fault | View Details |
| E05 |
E05 displayed and cooling output does not respond to setpoint changes.
|
Cooling Output Relay or Triac Fault | View Details |
| E06 |
Thermostat shows E06 and cannot control humidity; humidification/dehumidification functions are disabled.
|
Humidity Sensor Failure | View Details |
| E07 |
E07 displayed and thermostat cannot connect to Wi‑Fi or Schneider Electric cloud services.
|
Wi‑Fi Module Communication Error | View Details |
| E08 |
Thermostat displays E08 and cannot join the Schneider Electric Zigbee/Z-Wave network or building automation gateway.
|
Radio Mesh Module Failure (Zigbee/Z-Wave) | View Details |
| E09 |
E09 displayed and thermostat reports power supply error; screen may flicker or reboot intermittently.
|
Low Voltage Power Supply Fault | View Details |
| E10 |
Thermostat displays E10 and indicates communication loss with HVAC equipment or zone controller.
|
Equipment Communication Bus Failure | View Details |
| E11 |
E11 displayed and thermostat indicates over-temperature protection; outputs are shut down.
|
Over-Temperature Protection Trip | View Details |
| E12 |
Thermostat displays E12 and refuses to control outputs due to a configuration error.
|
Configuration / Parameter Error | View Details |
| E13 |
E13 displayed and thermostat indicates date/time or schedule memory error; schedules may be lost after power cycles.
|
Real-Time Clock / Backup Memory Fault | View Details |
| E14 |
Thermostat displays E14 and indicates a firmware error; some functions may be disabled.
|
Firmware Corruption | View Details |
| E15 |
E15 displayed and thermostat indicates lockout due to repeated sensor or output faults.
|
Safety Lockout Condition | View Details |
| E16 |
Thermostat displays E16 and indicates an external input fault (e.g., window contact, occupancy sensor).
|
Digital Input / Contact Fault | View Details |
| E17 |
E17 displayed and thermostat indicates fan output fault; fan does not respond correctly.
|
Fan Output Driver Failure | View Details |
| E18 |
Thermostat shows E18 and indicates valve or actuator output fault in hydronic systems.
|
Valve / Actuator Output Failure | View Details |
| E19 |
E19 is displayed, and the thermostat indicates an internal memory or data logging error.
|
Non-Volatile Memory Fault | View Details |
| E20 |
The thermostat shows E20 and indicates a calibration error; temperature readings are clearly incorrect.
|
Sensor Calibration Out of Range | View Details |
| – |
Cooling does not start even though the thermostat is set to <strong>Cool</strong> and the room temperature is above the setpoint.
|
No Cooling Call from Thermostat | View Details |
| – |
The room temperature shown on the thermostat is significantly different from the actual room temperature.
|
Inaccurate Temperature Sensing | View Details |
| – |
The thermostat backlight or display is very dim or flickers.
|
Display Backlight Power Issue | View Details |
| – |
The thermostat calls for heat, but the heating system runs continuously and overshoots the setpoint.
|
Heating Stuck On / Overshoot | View Details |
| – |
The thermostat cannot be discovered or controlled by the Schneider Electric Building Management System (BMS).
|
BMS Integration / Addressing Issue | View Details |
| – |
The thermostat controls hydronic floor heating, but some zones never get warm.
|
Zone Control / Actuator Issue | View Details |
| – |
The thermostat display is completely blank and does not power on.
|
No Power to Thermostat | View Details |
| – |
The thermostat does not follow the programmed schedule; heating/cooling occurs at incorrect times.
|
Scheduling / Clock Issue | View Details |
| – |
The thermostat does not respond to the occupancy sensor or presence detection; it stays in one mode.
|
Occupancy Input or Sensor Integration Failure | View Details |
| – |
The thermostat fails to control electric underfloor heating; the floor remains cold.
|
Underfloor Heating Output Not Energizing | View Details |
| – |
The thermostat frequently disconnects from Wi-Fi or the Schneider Electric cloud app.
|
Intermittent Network Connectivity | View Details |
| – |
The thermostat or the wall area around it feels unusually warm to the touch.
|
Thermostat Overheating | View Details |
| – |
The thermostat powers on but does not call for heat even when the room temperature is below the setpoint.
|
No Heat Call from Thermostat | View Details |
| – |
The thermostat randomly reboots or restarts several times a day.
|
Intermittent Power or Firmware Instability | View Details |
| – |
The thermostat screen is on, but touch controls or buttons do not respond.
|
Unresponsive User Interface | View Details |
| – |
The thermostat shows condensation or moisture inside the display cover.
|
Moisture Ingress / Condensation | View Details |
| – |
Thermostat causes short-cycling: The HVAC system turns on and off very frequently.
|
Short Cycling Due to Control Settings or Fault | View Details |
| – |
Thermostat shows correct temperature, but HVAC equipment runs at unexpected times or in the wrong mode.
|
Miswiring or Crossed Outputs | View Details |
No matching codes found
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