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 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 Z‑Wave network
Z‑Wave Radio Module Fault
E8
Thermostat shows E8 and 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
Thermostat buttons or touch interface do not respond
User Interface / Keypad Failure
Symptom
Thermostat calls for heat (indicator shows heating) but underfloor heating remains cold
No Output to Heating Load
Symptom
Thermostat cannot be added (included) to 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; floor gets too hot or stays cold while air is comfortable
Incorrect Sensor Priority / Floor Control Configuration
Symptom
Thermostat does not power on at all (no display, no response)
No Power / Dead Thermostat
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 powers on but does not call for heat even when setpoint is higher than room temperature
No Heat Call / Control Logic or Sensor Misconfiguration
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
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