Immergas
Immergas 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 cannot communicate with the Immergas boiler; heating does not start
Boiler Communication Failure
E02
Thermostat shows E02 and does not detect the boiler; remote control of heating and DHW is disabled
Boiler Not Detected on BUS
E03
Thermostat displays E03 and shows room temperature as "--"; heating does not regulate correctly
Internal Room Temperature Sensor Failure
E04
Thermostat shows E04 and does not display outdoor temperature; weather-compensation functions are disabled
Outdoor Temperature Sensor Failure
E05
Thermostat displays E05 and cannot control the heating zone valve or pump; zone remains off
Heating Zone Output Fault
E06
Thermostat shows E06 and cannot control domestic hot water (DHW) comfort functions
DHW Control Output Fault
E07
Thermostat shows E07 and cannot connect to the Wi‑Fi network; app control is unavailable
Wi‑Fi Module Communication Error
E08
Thermostat displays E08 and cannot connect to the Immergas cloud; local control works but remote app access fails
Cloud Server / Gateway Communication Error
E09
Thermostat shows E09 and does not respond to touch or button presses reliably
User Interface / Touch Panel Failure
E10
Thermostat displays E10 and shows a very high or very low room temperature that is clearly incorrect
Room Sensor Calibration Error
E11
Thermostat shows E11 and cannot detect the floor temperature sensor in underfloor heating mode
Floor Sensor Failure
E12
Thermostat displays E12 and cannot control the second heating zone or mixed circuit
Second Zone Control Fault
E13
Thermostat shows E13 and schedules or setpoints are lost after every power cut
Non-Volatile Memory Error
E14
Thermostat displays E14 and shows battery icon flashing (for battery-powered models); device may turn off unexpectedly
Low Battery / Power Supply Fault
E15
Thermostat shows E15 and the boiler does not respond to temperature changes; manual boiler controls still work
Setpoint Transmission Error
E16
Thermostat displays E16 and indicates an internal temperature too high; device may shut down intermittently
Thermostat Overtemperature Protection
E17
Thermostat shows E17 and cannot detect the Immergas radio receiver or gateway (for wireless models)
Radio Gateway Communication Error
E18
Thermostat displays E18 and time programs do not run correctly; clock resets after power loss
Real-Time Clock Error
E19
Thermostat shows E19 and cannot save new configuration parameters
Configuration Write Error
E20
Thermostat displays E20 and indicates a firmware or software error; device may reboot repeatedly
Firmware Integrity Error
Symptom
Room temperature overshoots setpoint by several degrees before boiler turns off
Overshoot Due to Incorrect Control Parameters
Symptom
Thermostat backlight flickers or brightness changes unexpectedly
Display Backlight Instability
Symptom
Thermostat buttons or touch keys are hard to press or unresponsive in certain areas
Partial Keypad / Touch Failure
Symptom
Thermostat cannot be added to the Immergas mobile app; pairing fails repeatedly
App Pairing / Registration Failure
Symptom
Thermostat does not control domestic hot water comfort mode as expected; DHW temperature remains unchanged
DHW Comfort Function Misconfiguration
Symptom
Thermostat does not follow programmed schedule; heating turns on/off at wrong times
Scheduling / Programming Fault
Symptom
Thermostat emits a buzzing or clicking noise frequently during operation
Noisy Relay or Power Supply
Symptom
Thermostat frequently loses Wi‑Fi connection; app shows device offline intermittently
Intermittent Wi‑Fi Connectivity
Symptom
Thermostat frequently resets or reboots on its own
Intermittent Power or Internal Fault
Symptom
Thermostat plastic housing is warm or hot to the touch during normal operation
Abnormal Thermostat Heating
Symptom
Thermostat powers on but does not turn the boiler on; boiler remains in standby
Call for Heat Not Reaching Boiler
Symptom
Thermostat screen completely blank, no lights or response
No Power to Thermostat
Symptom
Thermostat shows "no signal" or similar message for wireless radiator valves or remote sensors
Accessory Radio Link Failure
Symptom
Thermostat shows condensation or moisture inside the display window
Moisture Ingress
Symptom
Thermostat shows different temperature than other rooms; occupants complain of uneven heating
Poor Thermostat Placement / Zoning Issue
Symptom
Thermostat shows large temperature swings; room feels too cold then too hot repeatedly
Poor Temperature Regulation / Cycling
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Thermostat display shows E01 and cannot communicate with the Immergas boiler; heating does not start
|
Boiler Communication Failure | View Details |
| E02 |
Thermostat shows E02 and does not detect the boiler; remote control of heating and DHW is disabled
|
Boiler Not Detected on BUS | View Details |
| E03 |
Thermostat displays E03 and shows room temperature as "--"; heating does not regulate correctly
|
Internal Room Temperature Sensor Failure | View Details |
| E04 |
Thermostat shows E04 and does not display outdoor temperature; weather-compensation functions are disabled
|
Outdoor Temperature Sensor Failure | View Details |
| E05 |
Thermostat displays E05 and cannot control the heating zone valve or pump; zone remains off
|
Heating Zone Output Fault | View Details |
| E06 |
Thermostat shows E06 and cannot control domestic hot water (DHW) comfort functions
|
DHW Control Output Fault | View Details |
| E07 |
Thermostat shows E07 and cannot connect to the Wi‑Fi network; app control is unavailable
|
Wi‑Fi Module Communication Error | View Details |
| E08 |
Thermostat displays E08 and cannot connect to the Immergas cloud; local control works but remote app access fails
|
Cloud Server / Gateway Communication Error | View Details |
| E09 |
Thermostat shows E09 and does not respond to touch or button presses reliably
|
User Interface / Touch Panel Failure | View Details |
| E10 |
Thermostat displays E10 and shows a very high or very low room temperature that is clearly incorrect
|
Room Sensor Calibration Error | View Details |
| E11 |
Thermostat shows E11 and cannot detect the floor temperature sensor in underfloor heating mode
|
Floor Sensor Failure | View Details |
| E12 |
Thermostat displays E12 and cannot control the second heating zone or mixed circuit
|
Second Zone Control Fault | View Details |
| E13 |
Thermostat shows E13 and schedules or setpoints are lost after every power cut
|
Non-Volatile Memory Error | View Details |
| E14 |
Thermostat displays E14 and shows battery icon flashing (for battery-powered models); device may turn off unexpectedly
|
Low Battery / Power Supply Fault | View Details |
| E15 |
Thermostat shows E15 and the boiler does not respond to temperature changes; manual boiler controls still work
|
Setpoint Transmission Error | View Details |
| E16 |
Thermostat displays E16 and indicates an internal temperature too high; device may shut down intermittently
|
Thermostat Overtemperature Protection | View Details |
| E17 |
Thermostat shows E17 and cannot detect the Immergas radio receiver or gateway (for wireless models)
|
Radio Gateway Communication Error | View Details |
| E18 |
Thermostat displays E18 and time programs do not run correctly; clock resets after power loss
|
Real-Time Clock Error | View Details |
| E19 |
Thermostat shows E19 and cannot save new configuration parameters
|
Configuration Write Error | View Details |
| E20 |
Thermostat displays E20 and indicates a firmware or software error; device may reboot repeatedly
|
Firmware Integrity Error | View Details |
| – |
Room temperature overshoots setpoint by several degrees before boiler turns off
|
Overshoot Due to Incorrect Control Parameters | View Details |
| – |
Thermostat backlight flickers or brightness changes unexpectedly
|
Display Backlight Instability | View Details |
| – |
Thermostat buttons or touch keys are hard to press or unresponsive in certain areas
|
Partial Keypad / Touch Failure | View Details |
| – |
Thermostat cannot be added to the Immergas mobile app; pairing fails repeatedly
|
App Pairing / Registration Failure | View Details |
| – |
Thermostat does not control domestic hot water comfort mode as expected; DHW temperature remains unchanged
|
DHW Comfort Function Misconfiguration | View Details |
| – |
Thermostat does not follow programmed schedule; heating turns on/off at wrong times
|
Scheduling / Programming Fault | View Details |
| – |
Thermostat emits a buzzing or clicking noise frequently during operation
|
Noisy Relay or Power Supply | View Details |
| – |
Thermostat frequently loses Wi‑Fi connection; app shows device offline intermittently
|
Intermittent Wi‑Fi Connectivity | View Details |
| – |
Thermostat frequently resets or reboots on its own
|
Intermittent Power or Internal Fault | View Details |
| – |
Thermostat plastic housing is warm or hot to the touch during normal operation
|
Abnormal Thermostat Heating | View Details |
| – |
Thermostat powers on but does not turn the boiler on; boiler remains in standby
|
Call for Heat Not Reaching Boiler | View Details |
| – |
Thermostat screen completely blank, no lights or response
|
No Power to Thermostat | View Details |
| – |
Thermostat shows "no signal" or similar message for wireless radiator valves or remote sensors
|
Accessory Radio Link Failure | View Details |
| – |
Thermostat shows condensation or moisture inside the display window
|
Moisture Ingress | View Details |
| – |
Thermostat shows different temperature than other rooms; occupants complain of uneven heating
|
Poor Thermostat Placement / Zoning Issue | View Details |
| – |
Thermostat shows large temperature swings; room feels too cold then too hot repeatedly
|
Poor Temperature Regulation / Cycling | View Details |
No matching codes found
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