Netatmo
Netatmo 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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API_RATE_LIMIT
Third‑party integrations (Home Assistant, HomeKit, etc.) report API rate limit or too many requests; thermostat may appear offline in integrations while working in Netatmo app.
Cloud API Rate Limiting
BOILER_NO_RESPONSE
App or thermostat indicates that the boiler is not responding; heating does not start even when there is a call for heat.
Boiler Control Circuit Open
FIRMWARE_UPDATE_FAILED
App reports that the thermostat or Relay firmware update failed; device may reboot repeatedly or lose connection during updates.
Firmware Update Interruption
GEOLOCATION_ERROR
App reports an error with geolocation; away/home automation does not trigger correctly.
Geofencing Service Failure
INCOMPATIBLE_BOILER
During installation, the app reports that the boiler or heating system is incompatible with the Netatmo Smart Thermostat.
Boiler Control Interface Incompatibility
INTERNAL_ERROR
App or device reports an internal error; thermostat or Relay may reboot unexpectedly or behave erratically.
Internal Firmware or Hardware Fault
LOW_BATTERY
Thermostat or app indicates low battery; display may dim or become unresponsive intermittently.
Thermostat Power Degradation
NO_INTERNET
App shows the thermostat is connected to Wi‑Fi but has no internet access; remote control and weather‑based features fail.
Cloud Connectivity Failure
NO_RELAY
Thermostat shows a relay error and cannot control the boiler; heating does not turn on or off as requested.
Relay Module Communication Failure
NO_THERMOSTAT
Relay reports that no thermostat is detected; app shows the Relay online but no temperature or control from the thermostat.
Thermostat–Relay RF Link Failure
NO_WIFI
Thermostat or app reports that the Netatmo Relay is not connected to Wi‑Fi; remote control via app is unavailable.
Wi‑Fi Connectivity Loss
OPEN_WINDOW_DETECTED
App or thermostat indicates an open window detected; heating is temporarily reduced or stopped in the affected zone.
Open Window Detection Trigger
OVERHEAT_PROTECTION
System reports an overheat or safety shutdown; boiler stops even though thermostat is calling for heat.
Boiler Overheat or Safety Lockout Triggered by Control
SCHEDULE_SYNC_ERROR
Changes to heating schedule in the app do not appear on the thermostat; app may show a schedule synchronization error.
Schedule Synchronization Failure
SENSOR_ERROR
Thermostat or app shows a sensor error; room temperature reading is missing, frozen, or clearly incorrect (e.g., 0°C or 50°C indoors).
Internal Temperature Sensor Failure
TIME_SYNC_ERROR
Thermostat or app shows incorrect time or a time synchronization error; schedules trigger at wrong times.
NTP Time Synchronization Failure
VALVE_CALIBRATION_FAILED
A Smart Radiator Valve fails its calibration; app reports calibration error and the valve may not control the radiator temperature correctly.
Radiator Valve Motor or Stem Travel Fault
VALVE_COMM_ERROR
App shows that one or more Netatmo Smart Radiator Valves are unreachable or not responding to the thermostat.
Smart Radiator Valve RF Communication Failure
VALVE_LOW_BATTERY
App indicates low battery on one or more Smart Radiator Valves; valves may stop responding or lose calibration.
Radiator Valve Power Degradation
Symptom
Boiler never starts; no heating even when thermostat is set high and app shows a call for heat.
Open Thermostat Circuit or No Call for Heat at Boiler
Symptom
Boiler runs continuously even when the thermostat setpoint is reached and the app shows no call for heat.
Stuck Relay Contact Closed
Symptom
Condensation or visible moisture inside thermostat or Smart Radiator Valve housing.
Moisture Ingress
Symptom
Heating turns on at unexpected times or ignores the manual override set in the app.
Schedule or Override Logic Misconfiguration
Symptom
Netatmo devices frequently drop from HomeKit, Google Home, or other smart home platforms while still working in the Netatmo app.
Smart Home Bridge Instability
Symptom
Relay LED blinks continuously and never becomes steady; thermostat and app cannot control heating.
Relay Boot or Pairing Loop
Symptom
Relay LED does not light at all when plugged in or powered from boiler.
Relay Power Supply Failure
Symptom
Room never reaches the set temperature; heating seems too weak even though the thermostat is calling for heat.
Underheating / Insufficient Heat Output
Symptom
Room temperature overshoots the setpoint by several degrees before the heating turns off.
Thermostat Overshoot / Poor Regulation
Symptom
Smart Radiator Valve cannot be installed securely; it wobbles or falls off the radiator.
Mechanical Mounting Incompatibility
Symptom
Smart Radiator Valve does not heat the radiator even when set to a high temperature.
Radiator Valve Stuck Closed or Mis‑calibrated
Symptom
Smart Radiator Valve makes loud grinding or clicking noises during operation.
Radiator Valve Motor or Gearbox Wear
Symptom
Thermostat display is completely blank and unresponsive.
Thermostat Power Loss
Symptom
Thermostat display is on but buttons or touch interface do not respond.
User Interface Keypad Failure
Symptom
Thermostat frequently loses connection to the Relay; app shows the thermostat going offline and online repeatedly.
Intermittent RF Link Instability
Symptom
Thermostat or valves emit a high‑pitched whining noise when operating.
Acoustic Noise from Electronics or Motor
Symptom
Thermostat or valves feel unusually warm to the touch and may behave erratically.
Device Overheating
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| API_RATE_LIMIT |
Third‑party integrations (Home Assistant, HomeKit, etc.) report API rate limit or too many requests; thermostat may appear offline in integrations while working in Netatmo app.
|
Cloud API Rate Limiting | View Details |
| BOILER_NO_RESPONSE |
App or thermostat indicates that the boiler is not responding; heating does not start even when there is a call for heat.
|
Boiler Control Circuit Open | View Details |
| FIRMWARE_UPDATE_FAILED |
App reports that the thermostat or Relay firmware update failed; device may reboot repeatedly or lose connection during updates.
|
Firmware Update Interruption | View Details |
| GEOLOCATION_ERROR |
App reports an error with geolocation; away/home automation does not trigger correctly.
|
Geofencing Service Failure | View Details |
| INCOMPATIBLE_BOILER |
During installation, the app reports that the boiler or heating system is incompatible with the Netatmo Smart Thermostat.
|
Boiler Control Interface Incompatibility | View Details |
| INTERNAL_ERROR |
App or device reports an internal error; thermostat or Relay may reboot unexpectedly or behave erratically.
|
Internal Firmware or Hardware Fault | View Details |
| LOW_BATTERY |
Thermostat or app indicates low battery; display may dim or become unresponsive intermittently.
|
Thermostat Power Degradation | View Details |
| NO_INTERNET |
App shows the thermostat is connected to Wi‑Fi but has no internet access; remote control and weather‑based features fail.
|
Cloud Connectivity Failure | View Details |
| NO_RELAY |
Thermostat shows a relay error and cannot control the boiler; heating does not turn on or off as requested.
|
Relay Module Communication Failure | View Details |
| NO_THERMOSTAT |
Relay reports that no thermostat is detected; app shows the Relay online but no temperature or control from the thermostat.
|
Thermostat–Relay RF Link Failure | View Details |
| NO_WIFI |
Thermostat or app reports that the Netatmo Relay is not connected to Wi‑Fi; remote control via app is unavailable.
|
Wi‑Fi Connectivity Loss | View Details |
| OPEN_WINDOW_DETECTED |
App or thermostat indicates an open window detected; heating is temporarily reduced or stopped in the affected zone.
|
Open Window Detection Trigger | View Details |
| OVERHEAT_PROTECTION |
System reports an overheat or safety shutdown; boiler stops even though thermostat is calling for heat.
|
Boiler Overheat or Safety Lockout Triggered by Control | View Details |
| SCHEDULE_SYNC_ERROR |
Changes to heating schedule in the app do not appear on the thermostat; app may show a schedule synchronization error.
|
Schedule Synchronization Failure | View Details |
| SENSOR_ERROR |
Thermostat or app shows a sensor error; room temperature reading is missing, frozen, or clearly incorrect (e.g., 0°C or 50°C indoors).
|
Internal Temperature Sensor Failure | View Details |
| TIME_SYNC_ERROR |
Thermostat or app shows incorrect time or a time synchronization error; schedules trigger at wrong times.
|
NTP Time Synchronization Failure | View Details |
| VALVE_CALIBRATION_FAILED |
A Smart Radiator Valve fails its calibration; app reports calibration error and the valve may not control the radiator temperature correctly.
|
Radiator Valve Motor or Stem Travel Fault | View Details |
| VALVE_COMM_ERROR |
App shows that one or more Netatmo Smart Radiator Valves are unreachable or not responding to the thermostat.
|
Smart Radiator Valve RF Communication Failure | View Details |
| VALVE_LOW_BATTERY |
App indicates low battery on one or more Smart Radiator Valves; valves may stop responding or lose calibration.
|
Radiator Valve Power Degradation | View Details |
| – |
Boiler never starts; no heating even when thermostat is set high and app shows a call for heat.
|
Open Thermostat Circuit or No Call for Heat at Boiler | View Details |
| – |
Boiler runs continuously even when the thermostat setpoint is reached and the app shows no call for heat.
|
Stuck Relay Contact Closed | View Details |
| – |
Condensation or visible moisture inside thermostat or Smart Radiator Valve housing.
|
Moisture Ingress | View Details |
| – |
Heating turns on at unexpected times or ignores the manual override set in the app.
|
Schedule or Override Logic Misconfiguration | View Details |
| – |
Netatmo devices frequently drop from HomeKit, Google Home, or other smart home platforms while still working in the Netatmo app.
|
Smart Home Bridge Instability | View Details |
| – |
Relay LED blinks continuously and never becomes steady; thermostat and app cannot control heating.
|
Relay Boot or Pairing Loop | View Details |
| – |
Relay LED does not light at all when plugged in or powered from boiler.
|
Relay Power Supply Failure | View Details |
| – |
Room never reaches the set temperature; heating seems too weak even though the thermostat is calling for heat.
|
Underheating / Insufficient Heat Output | View Details |
| – |
Room temperature overshoots the setpoint by several degrees before the heating turns off.
|
Thermostat Overshoot / Poor Regulation | View Details |
| – |
Smart Radiator Valve cannot be installed securely; it wobbles or falls off the radiator.
|
Mechanical Mounting Incompatibility | View Details |
| – |
Smart Radiator Valve does not heat the radiator even when set to a high temperature.
|
Radiator Valve Stuck Closed or Mis‑calibrated | View Details |
| – |
Smart Radiator Valve makes loud grinding or clicking noises during operation.
|
Radiator Valve Motor or Gearbox Wear | View Details |
| – |
Thermostat display is completely blank and unresponsive.
|
Thermostat Power Loss | View Details |
| – |
Thermostat display is on but buttons or touch interface do not respond.
|
User Interface Keypad Failure | View Details |
| – |
Thermostat frequently loses connection to the Relay; app shows the thermostat going offline and online repeatedly.
|
Intermittent RF Link Instability | View Details |
| – |
Thermostat or valves emit a high‑pitched whining noise when operating.
|
Acoustic Noise from Electronics or Motor | View Details |
| – |
Thermostat or valves feel unusually warm to the touch and may behave erratically.
|
Device Overheating | View Details |
No matching codes found
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