Atlantic
Atlantic 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
The thermostat display shows E01 and cannot connect to Wi‑Fi or Atlantic cloud services.
Wi‑Fi Module Communication Failure
E02
Thermostat shows E02 and does not detect the indoor temperature correctly (reads -- or extreme values).
Internal Room Temperature Sensor Failure
E03
E03 displayed and thermostat cannot read floor temperature in underfloor heating mode.
Remote Floor Sensor Circuit Open or Short
E04
Thermostat shows E04 and heating/cooling outputs are disabled.
Internal Overtemperature Protection Triggered
E05
E05 displayed and thermostat cannot control heating; relay output remains off.
Output Relay or Triac Failure
E06
E06 error and thermostat cannot detect external boiler or heat pump communication bus.
OpenTherm / Modbus Communication Failure
E07
E07 displayed and thermostat shows battery icon with a cross or low level (for battery‑assisted or wireless models).
Low Battery or Battery Circuit Failure
E08
E08 error and thermostat reboots intermittently or freezes.
Firmware or Memory Corruption
E09
E09 displayed and thermostat cannot detect the external wireless receiver or gateway.
RF Link Loss Between Thermostat and Receiver
E10
E10 error and thermostat reports power supply fault or keeps turning off when HVAC starts.
Low Voltage or Power Supply Instability
E11
E11 displayed and thermostat cannot detect humidity level or shows 0%/100% constantly.
Internal Humidity Sensor Failure
E12
E12 error: The thermostat cannot detect the external temperature sensor (for outdoor compensation).
Outdoor Temperature Sensor Fault
E13
E13 displayed: The thermostat indicates an internal clock or schedule error.
Real-Time Clock (RTC) or Timekeeping Failure
E14
E14 error: The thermostat reports an internal sensor calibration fault.
Sensor Calibration Out of Range
E15
E15 displayed: The thermostat cannot control cooling output; the cooling relay is locked out.
Compressor Protection or Cooling Output Fault
E16
E16 error: The thermostat indicates an internal fan control fault.
Fan Output Driver Failure
E17
E17 displayed: The thermostat cannot connect to Atlantic cloud services while Wi-Fi appears connected.
Cloud Service or TLS Communication Error
E18
E18 error: The thermostat reports an internal sensor bus fault (multiple sensors offline).
Internal I²C/SPI Sensor Bus Failure
E19
E19 displayed: The thermostat indicates a geofencing or presence detection error.
Presence/Geolocation Service Fault
E20
E20 error: The thermostat shows a lock icon, and settings cannot be changed.
Keypad/Child Lock or Installer Lock Active
Symptom
Condensation or moisture visible inside thermostat cover.
Moisture Ingress
Symptom
The Atlantic app shows the thermostat offline even though local control works.
Cloud Connectivity Desynchronization
Symptom
The thermostat shows a temperature that is clearly inaccurate compared to other thermometers.
Temperature Reading Offset
Symptom
Thermostat Wi-Fi setup fails repeatedly; the device never appears in the Atlantic app.
Wi-Fi Provisioning Failure
Symptom
Thermostat backplate or housing feels unusually warm to the touch.
Excessive Internal Heating
Symptom
Thermostat calls for cooling but the outdoor unit does not run.
No Cooling Call Transmission
Symptom
Thermostat calls for heat but boiler or heat pump does not start.
No Heat Call Transmission
Symptom
Thermostat display completely dead, no backlight, and HVAC does not respond.
No Power to Thermostat
Symptom
Thermostat does not control underfloor heating evenly; some areas too hot, others cold.
Underfloor Heating Zoning or Sensor Placement Issue
Symptom
Thermostat does not follow programmed schedule; stays at one temperature.
Schedule Not Executing
Symptom
Thermostat emits a faint buzzing or clicking noise during operation.
Relay or Transformer Noise
Symptom
Thermostat fails to control domestic hot water (DHW) as scheduled.
DHW Control Misconfiguration
Symptom
Thermostat frequently short-cycles the boiler or heat pump (turns on and off every few minutes).
Short Cycling Due to Control Settings
Symptom
Thermostat loses Wi-Fi connection intermittently but continues to control temperature locally.
Unstable Wi-Fi Connection
Symptom
Thermostat overshoots the set temperature by several degrees before turning the system off.
Poor Temperature Control or Overshoot
Symptom
Thermostat powers on but frequently reboots or flickers when heating or cooling starts.
Power Brownout or Grounding Issue
Symptom
Thermostat randomly switches between heating and cooling modes without user input.
Auto‑Changeover Misconfiguration or Sensor Error
Symptom
Thermostat screen is on but unresponsive to touch or button presses.
Frozen User Interface or Touch Panel Failure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
The thermostat display shows E01 and cannot connect to Wi‑Fi or Atlantic cloud services.
|
Wi‑Fi Module Communication Failure | View Details |
| E02 |
Thermostat shows E02 and does not detect the indoor temperature correctly (reads -- or extreme values).
|
Internal Room Temperature Sensor Failure | View Details |
| E03 |
E03 displayed and thermostat cannot read floor temperature in underfloor heating mode.
|
Remote Floor Sensor Circuit Open or Short | View Details |
| E04 |
Thermostat shows E04 and heating/cooling outputs are disabled.
|
Internal Overtemperature Protection Triggered | View Details |
| E05 |
E05 displayed and thermostat cannot control heating; relay output remains off.
|
Output Relay or Triac Failure | View Details |
| E06 |
E06 error and thermostat cannot detect external boiler or heat pump communication bus.
|
OpenTherm / Modbus Communication Failure | View Details |
| E07 |
E07 displayed and thermostat shows battery icon with a cross or low level (for battery‑assisted or wireless models).
|
Low Battery or Battery Circuit Failure | View Details |
| E08 |
E08 error and thermostat reboots intermittently or freezes.
|
Firmware or Memory Corruption | View Details |
| E09 |
E09 displayed and thermostat cannot detect the external wireless receiver or gateway.
|
RF Link Loss Between Thermostat and Receiver | View Details |
| E10 |
E10 error and thermostat reports power supply fault or keeps turning off when HVAC starts.
|
Low Voltage or Power Supply Instability | View Details |
| E11 |
E11 displayed and thermostat cannot detect humidity level or shows 0%/100% constantly.
|
Internal Humidity Sensor Failure | View Details |
| E12 |
E12 error: The thermostat cannot detect the external temperature sensor (for outdoor compensation).
|
Outdoor Temperature Sensor Fault | View Details |
| E13 |
E13 displayed: The thermostat indicates an internal clock or schedule error.
|
Real-Time Clock (RTC) or Timekeeping Failure | View Details |
| E14 |
E14 error: The thermostat reports an internal sensor calibration fault.
|
Sensor Calibration Out of Range | View Details |
| E15 |
E15 displayed: The thermostat cannot control cooling output; the cooling relay is locked out.
|
Compressor Protection or Cooling Output Fault | View Details |
| E16 |
E16 error: The thermostat indicates an internal fan control fault.
|
Fan Output Driver Failure | View Details |
| E17 |
E17 displayed: The thermostat cannot connect to Atlantic cloud services while Wi-Fi appears connected.
|
Cloud Service or TLS Communication Error | View Details |
| E18 |
E18 error: The thermostat reports an internal sensor bus fault (multiple sensors offline).
|
Internal I²C/SPI Sensor Bus Failure | View Details |
| E19 |
E19 displayed: The thermostat indicates a geofencing or presence detection error.
|
Presence/Geolocation Service Fault | View Details |
| E20 |
E20 error: The thermostat shows a lock icon, and settings cannot be changed.
|
Keypad/Child Lock or Installer Lock Active | View Details |
| – |
Condensation or moisture visible inside thermostat cover.
|
Moisture Ingress | View Details |
| – |
The Atlantic app shows the thermostat offline even though local control works.
|
Cloud Connectivity Desynchronization | View Details |
| – |
The thermostat shows a temperature that is clearly inaccurate compared to other thermometers.
|
Temperature Reading Offset | View Details |
| – |
Thermostat Wi-Fi setup fails repeatedly; the device never appears in the Atlantic app.
|
Wi-Fi Provisioning Failure | View Details |
| – |
Thermostat backplate or housing feels unusually warm to the touch.
|
Excessive Internal Heating | View Details |
| – |
Thermostat calls for cooling but the outdoor unit does not run.
|
No Cooling Call Transmission | View Details |
| – |
Thermostat calls for heat but boiler or heat pump does not start.
|
No Heat Call Transmission | View Details |
| – |
Thermostat display completely dead, no backlight, and HVAC does not respond.
|
No Power to Thermostat | View Details |
| – |
Thermostat does not control underfloor heating evenly; some areas too hot, others cold.
|
Underfloor Heating Zoning or Sensor Placement Issue | View Details |
| – |
Thermostat does not follow programmed schedule; stays at one temperature.
|
Schedule Not Executing | View Details |
| – |
Thermostat emits a faint buzzing or clicking noise during operation.
|
Relay or Transformer Noise | View Details |
| – |
Thermostat fails to control domestic hot water (DHW) as scheduled.
|
DHW Control Misconfiguration | View Details |
| – |
Thermostat frequently short-cycles the boiler or heat pump (turns on and off every few minutes).
|
Short Cycling Due to Control Settings | View Details |
| – |
Thermostat loses Wi-Fi connection intermittently but continues to control temperature locally.
|
Unstable Wi-Fi Connection | View Details |
| – |
Thermostat overshoots the set temperature by several degrees before turning the system off.
|
Poor Temperature Control or Overshoot | View Details |
| – |
Thermostat powers on but frequently reboots or flickers when heating or cooling starts.
|
Power Brownout or Grounding Issue | View Details |
| – |
Thermostat randomly switches between heating and cooling modes without user input.
|
Auto‑Changeover Misconfiguration or Sensor Error | View Details |
| – |
Thermostat screen is on but unresponsive to touch or button presses.
|
Frozen User Interface or Touch Panel Failure | View Details |
No matching codes found
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