Fibaro
Fibaro 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 display shows E1, and heating does not turn on.
Floor Temperature Sensor Open Circuit
E10
Thermostat shows E10 and cannot be configured or reset.
Non-Volatile Memory (NVM) / Configuration Storage Error
E11
Thermostat shows E11 and ignores commands from the Fibaro controller.
Communication Timeout / Controller Link Error
E12
Thermostat shows E12, and schedules do not run correctly.
Real-Time Clock (RTC) / Timekeeping Error
E13
Thermostat shows E13, and backlight or display segments are missing.
Display / LCD Module Fault
E14
Thermostat shows E14, and the heating output is locked out.
Internal Safety Lockout / Self-Test Failure
E2
Thermostat display shows E2, and heating cycles erratically.
Floor Temperature Sensor Short Circuit
E3
Thermostat shows E3, and reports incorrect room temperature.
Internal Air Temperature Sensor Fault
E4
Thermostat shows E4, and heating output is disabled.
Overtemperature Protection Triggered
E5
Thermostat shows E5, and cannot control heating properly.
External Temperature Sensor Fault (Remote Sensor)
E6
Thermostat shows E6, and does not respond to setpoint changes.
Internal Relay Failure
E7
Thermostat shows E7, and cannot connect to the Z-Wave network.
Z-Wave Radio Module Fault
E8
Thermostat shows E8, and the screen is dim or flickering.
Low Supply Voltage / Power Supply Fault
E9
Thermostat shows E9 and cannot drive the heating actuator.
Output Triac / Solid-State Switch Fault
Symptom
The thermostat calls for heat (indicator shows heating), but the underfloor heating remains cold.
No Output to Heating Load
Symptom
The thermostat does not power on at all (no display, no response).
No Power / Dead Thermostat
Symptom
The thermostat powers on but does not call for heat even when the setpoint is higher than the room temperature.
No Heat Call / Control Logic or Sensor Misconfiguration
Symptom
Thermostat buttons or touch interface do not respond
User Interface / Keypad Failure
Symptom
Thermostat cannot be added (included) to the Fibaro Z-Wave network.
Inclusion Failure
Symptom
Thermostat causes audible clicking or buzzing from connected actuators
Incompatible Control Mode / Actuator Noise
Symptom
Thermostat causes breaker to trip when heating turns on
Overcurrent / Short Circuit on Heating Circuit
Symptom
Thermostat display is on but screen is very dim or unreadable
Backlight Degradation / Display Power Issue
Symptom
Thermostat does not control floor temperature correctly; the floor gets too hot or stays cold while the air is comfortable.
Incorrect Sensor Priority / Floor Control Configuration
Symptom
Thermostat emits a buzzing or humming noise.
Internal Electrical Noise / Coil Vibration
Symptom
Thermostat fails to control multiple zones correctly when used with Fibaro relay modules.
Multi-Zone Control Misconfiguration
Symptom
Thermostat frequently cycles heating on and off (short cycling)
Short Cycling / Control Instability
Symptom
Thermostat loses connection to Fibaro controller intermittently
Intermittent Z‑Wave Connectivity
Symptom
Thermostat or wall area feels unusually warm to the touch
Thermostat Overheating
Symptom
Thermostat overshoots set temperature and room becomes too hot
Temperature Overshoot / Poor Calibration
Symptom
Thermostat plastic housing is discolored or warped.
Heat Damage / UV Exposure
Symptom
Thermostat randomly resets or reboots during operation.
Unstable Power / Internal Reset
Symptom
Thermostat schedule does not follow programmed times (heating at wrong times)
Scheduling / Programming Error
Symptom
Thermostat shows correct temperature, but heating output is inverted (heats when it should be off, off when it should heat).
Reversed Logic / Output Configuration Error
Symptom
Thermostat shows much higher or lower temperature than actual room temperature
Temperature Sensor Miscalibration
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Thermostat display shows E1, and heating does not turn on.
|
Floor Temperature Sensor Open Circuit | View Details |
| E10 |
Thermostat shows E10 and cannot be configured or reset.
|
Non-Volatile Memory (NVM) / Configuration Storage Error | View Details |
| E11 |
Thermostat shows E11 and ignores commands from the Fibaro controller.
|
Communication Timeout / Controller Link Error | View Details |
| E12 |
Thermostat shows E12, and schedules do not run correctly.
|
Real-Time Clock (RTC) / Timekeeping Error | View Details |
| E13 |
Thermostat shows E13, and backlight or display segments are missing.
|
Display / LCD Module Fault | View Details |
| E14 |
Thermostat shows E14, and the heating output is locked out.
|
Internal Safety Lockout / Self-Test Failure | View Details |
| E2 |
Thermostat display shows E2, and heating cycles erratically.
|
Floor Temperature Sensor Short Circuit | View Details |
| E3 |
Thermostat shows E3, and reports incorrect room temperature.
|
Internal Air Temperature Sensor Fault | View Details |
| E4 |
Thermostat shows E4, and heating output is disabled.
|
Overtemperature Protection Triggered | View Details |
| E5 |
Thermostat shows E5, and cannot control heating properly.
|
External Temperature Sensor Fault (Remote Sensor) | View Details |
| E6 |
Thermostat shows E6, and does not respond to setpoint changes.
|
Internal Relay Failure | View Details |
| E7 |
Thermostat shows E7, and cannot connect to the Z-Wave network.
|
Z-Wave Radio Module Fault | View Details |
| E8 |
Thermostat shows E8, and the screen is dim or flickering.
|
Low Supply Voltage / Power Supply Fault | View Details |
| E9 |
Thermostat shows E9 and cannot drive the heating actuator.
|
Output Triac / Solid-State Switch Fault | View Details |
| – |
The thermostat calls for heat (indicator shows heating), but the underfloor heating remains cold.
|
No Output to Heating Load | View Details |
| – |
The thermostat does not power on at all (no display, no response).
|
No Power / Dead Thermostat | View Details |
| – |
The thermostat powers on but does not call for heat even when the setpoint is higher than the room temperature.
|
No Heat Call / Control Logic or Sensor Misconfiguration | View Details |
| – |
Thermostat buttons or touch interface do not respond
|
User Interface / Keypad Failure | View Details |
| – |
Thermostat cannot be added (included) to the Fibaro Z-Wave network.
|
Inclusion Failure | View Details |
| – |
Thermostat causes audible clicking or buzzing from connected actuators
|
Incompatible Control Mode / Actuator Noise | View Details |
| – |
Thermostat causes breaker to trip when heating turns on
|
Overcurrent / Short Circuit on Heating Circuit | View Details |
| – |
Thermostat display is on but screen is very dim or unreadable
|
Backlight Degradation / Display Power Issue | View Details |
| – |
Thermostat does not control floor temperature correctly; the floor gets too hot or stays cold while the air is comfortable.
|
Incorrect Sensor Priority / Floor Control Configuration | View Details |
| – |
Thermostat emits a buzzing or humming noise.
|
Internal Electrical Noise / Coil Vibration | View Details |
| – |
Thermostat fails to control multiple zones correctly when used with Fibaro relay modules.
|
Multi-Zone Control Misconfiguration | View Details |
| – |
Thermostat frequently cycles heating on and off (short cycling)
|
Short Cycling / Control Instability | View Details |
| – |
Thermostat loses connection to Fibaro controller intermittently
|
Intermittent Z‑Wave Connectivity | View Details |
| – |
Thermostat or wall area feels unusually warm to the touch
|
Thermostat Overheating | View Details |
| – |
Thermostat overshoots set temperature and room becomes too hot
|
Temperature Overshoot / Poor Calibration | View Details |
| – |
Thermostat plastic housing is discolored or warped.
|
Heat Damage / UV Exposure | View Details |
| – |
Thermostat randomly resets or reboots during operation.
|
Unstable Power / Internal Reset | View Details |
| – |
Thermostat schedule does not follow programmed times (heating at wrong times)
|
Scheduling / Programming Error | View Details |
| – |
Thermostat shows correct temperature, but heating output is inverted (heats when it should be off, off when it should heat).
|
Reversed Logic / Output Configuration Error | View Details |
| – |
Thermostat shows much higher or lower temperature than actual room temperature
|
Temperature Sensor Miscalibration | View Details |
No matching codes found
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