Delta Dore
Delta Dore 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 heating does not start even when there is a demand for heat.
RF Link Loss Between Thermostat and Delta Dore Receiver
E02
Thermostat shows E02 and does not control heating correctly; temperature reading may be frozen or missing.
Internal Room Temperature Sensor Failure
E03
E03 displayed and thermostat cannot detect the external floor sensor or remote probe; underfloor heating may not regulate correctly.
External Sensor Circuit Open or Not Detected
E04
E04 appears and the thermostat shows an abnormally high or low temperature reading; heating may shut down for safety.
External Sensor Short Circuit or Out-of-Range Reading
E05
Thermostat shows E05 and cannot control the boiler; receiver output does not switch when there is a heat demand.
Relay Output Fault in RF Receiver or Wired Relay Module
E06
E06 displayed and thermostat cannot connect to the Delta Dore smart gateway (Tydom) or cloud services; app control fails.
IP / Cloud Communication Failure
E07
E07 appears and the thermostat cannot join the Zigbee or proprietary Delta Dore mesh network; no remote control via app.
Zigbee / RF Module Initialization Error
E08
E08 displayed and thermostat cannot detect the boiler interface module; heating remains off.
Bus Communication Failure with Boiler Interface
E09
E09 appears and the thermostat reboots repeatedly or freezes; display may flicker.
Power Supply or Internal Voltage Regulation Fault
E10
E10 displayed and thermostat cannot control domestic hot water (DHW) even though heating control works.
DHW Control Channel Fault
E11
E11 appears and the thermostat reports a battery fault even after new batteries are installed; device may shut down unexpectedly.
Battery Detection / Low Voltage Sensing Error
E12
E12 displayed and thermostat cannot read or write schedules; programming changes are not saved.
Non-Volatile Memory (NVM) Error
E13
E13 appears and the thermostat refuses to start heating due to an over-temperature safety condition.
Over-Temperature Protection Triggered
E14
E14 displayed and thermostat cannot detect one or more wireless radiator actuators or zone modules.
Lost Communication with Wireless Actuator / Zone Module
E15
E15 appears and the thermostat reports a firmware update failure; some functions may be disabled.
Firmware Update Error
E16
E16 displayed and thermostat indicates a clock or timekeeping error; schedules run at incorrect times.
Real-Time Clock (RTC) Failure
E17
E17 appears and the thermostat reports a configuration or parameter error; some menus may be locked.
Configuration Data Corruption
E18
E18 displayed and thermostat indicates a humidity sensor fault (on models with integrated humidity measurement).
Internal Humidity Sensor Failure
E19
E19 appears and the thermostat cannot control the heat pump; system may lock out.
Heat Pump Control or Defrost Communication Error
E20
E20 displayed and thermostat reports a sensor calibration error; measured temperature is offset significantly.
Temperature Sensor Calibration Out of Range
Symptom
Radiator zones controlled by Delta Dore actuators do not heat evenly; some rooms are cold while others are warm.
Zoned Heating Imbalance or Actuator Fault
Symptom
Thermostat backlight or display is very dim or partially unreadable, but device still controls heating.
Display / Backlight Degradation
Symptom
Thermostat buttons or touchscreen are unresponsive or require very hard presses.
User Interface / Keypad Failure
Symptom
Thermostat calls for heat but boiler does not start; receiver LED indicates demand.
Open Circuit Between Receiver and Boiler
Symptom
Thermostat cannot be added to the Tydom app; pairing fails repeatedly.
Pairing / Enrollment Failure
Symptom
Thermostat cycles the boiler on and off very frequently, causing noise and wear.
Short Cycling Due to Control Settings or Sensor Placement
Symptom
Thermostat display completely blank and unresponsive; heating does not start.
No Power to Thermostat
Symptom
Thermostat does not follow programmed schedule; heating turns on or off at unexpected times.
Scheduling / Time Configuration Issue
Symptom
Thermostat emits a beeping sound or warning icon without a specific error code; heating may still work.
General Warning (Battery, Connectivity, or Maintenance)
Symptom
Thermostat frequently loses connection to the Delta Dore Tydom gateway; app shows device offline intermittently.
Intermittent RF / IP Connectivity
Symptom
Thermostat or receiver emits a constant clicking noise as the relay switches rapidly.
Relay Chatter Due to Unstable Control Signal
Symptom
Thermostat or receiver feels unusually hot to the touch during normal operation.
Overheating of Internal Components
Symptom
Thermostat powers on but does not call for heat; boiler or receiver never activates even when setpoint is higher than room temperature.
No Heat Demand Output
Symptom
Thermostat randomly resets to factory settings, losing schedules and configuration.
Intermittent Memory or Power Glitch
Symptom
Thermostat shows temperature much higher or lower than actual room temperature, causing poor comfort.
Incorrect Temperature Measurement
Symptom
Thermostat shows Wi‑Fi or cloud icon with a cross; remote control via smartphone app does not work, but local control is fine.
Cloud / Remote Access Failure
Symptom
Underfloor heating controlled by the thermostat is slow to respond or never reaches set temperature.
Underfloor Heating Control or Sensor Misconfiguration
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Thermostat display shows E01 and heating does not start even when there is a demand for heat.
|
RF Link Loss Between Thermostat and Delta Dore Receiver | View Details |
| E02 |
Thermostat shows E02 and does not control heating correctly; temperature reading may be frozen or missing.
|
Internal Room Temperature Sensor Failure | View Details |
| E03 |
E03 displayed and thermostat cannot detect the external floor sensor or remote probe; underfloor heating may not regulate correctly.
|
External Sensor Circuit Open or Not Detected | View Details |
| E04 |
E04 appears and the thermostat shows an abnormally high or low temperature reading; heating may shut down for safety.
|
External Sensor Short Circuit or Out-of-Range Reading | View Details |
| E05 |
Thermostat shows E05 and cannot control the boiler; receiver output does not switch when there is a heat demand.
|
Relay Output Fault in RF Receiver or Wired Relay Module | View Details |
| E06 |
E06 displayed and thermostat cannot connect to the Delta Dore smart gateway (Tydom) or cloud services; app control fails.
|
IP / Cloud Communication Failure | View Details |
| E07 |
E07 appears and the thermostat cannot join the Zigbee or proprietary Delta Dore mesh network; no remote control via app.
|
Zigbee / RF Module Initialization Error | View Details |
| E08 |
E08 displayed and thermostat cannot detect the boiler interface module; heating remains off.
|
Bus Communication Failure with Boiler Interface | View Details |
| E09 |
E09 appears and the thermostat reboots repeatedly or freezes; display may flicker.
|
Power Supply or Internal Voltage Regulation Fault | View Details |
| E10 |
E10 displayed and thermostat cannot control domestic hot water (DHW) even though heating control works.
|
DHW Control Channel Fault | View Details |
| E11 |
E11 appears and the thermostat reports a battery fault even after new batteries are installed; device may shut down unexpectedly.
|
Battery Detection / Low Voltage Sensing Error | View Details |
| E12 |
E12 displayed and thermostat cannot read or write schedules; programming changes are not saved.
|
Non-Volatile Memory (NVM) Error | View Details |
| E13 |
E13 appears and the thermostat refuses to start heating due to an over-temperature safety condition.
|
Over-Temperature Protection Triggered | View Details |
| E14 |
E14 displayed and thermostat cannot detect one or more wireless radiator actuators or zone modules.
|
Lost Communication with Wireless Actuator / Zone Module | View Details |
| E15 |
E15 appears and the thermostat reports a firmware update failure; some functions may be disabled.
|
Firmware Update Error | View Details |
| E16 |
E16 displayed and thermostat indicates a clock or timekeeping error; schedules run at incorrect times.
|
Real-Time Clock (RTC) Failure | View Details |
| E17 |
E17 appears and the thermostat reports a configuration or parameter error; some menus may be locked.
|
Configuration Data Corruption | View Details |
| E18 |
E18 displayed and thermostat indicates a humidity sensor fault (on models with integrated humidity measurement).
|
Internal Humidity Sensor Failure | View Details |
| E19 |
E19 appears and the thermostat cannot control the heat pump; system may lock out.
|
Heat Pump Control or Defrost Communication Error | View Details |
| E20 |
E20 displayed and thermostat reports a sensor calibration error; measured temperature is offset significantly.
|
Temperature Sensor Calibration Out of Range | View Details |
| – |
Radiator zones controlled by Delta Dore actuators do not heat evenly; some rooms are cold while others are warm.
|
Zoned Heating Imbalance or Actuator Fault | View Details |
| – |
Thermostat backlight or display is very dim or partially unreadable, but device still controls heating.
|
Display / Backlight Degradation | View Details |
| – |
Thermostat buttons or touchscreen are unresponsive or require very hard presses.
|
User Interface / Keypad Failure | View Details |
| – |
Thermostat calls for heat but boiler does not start; receiver LED indicates demand.
|
Open Circuit Between Receiver and Boiler | View Details |
| – |
Thermostat cannot be added to the Tydom app; pairing fails repeatedly.
|
Pairing / Enrollment Failure | View Details |
| – |
Thermostat cycles the boiler on and off very frequently, causing noise and wear.
|
Short Cycling Due to Control Settings or Sensor Placement | View Details |
| – |
Thermostat display completely blank and unresponsive; heating does not start.
|
No Power to Thermostat | View Details |
| – |
Thermostat does not follow programmed schedule; heating turns on or off at unexpected times.
|
Scheduling / Time Configuration Issue | View Details |
| – |
Thermostat emits a beeping sound or warning icon without a specific error code; heating may still work.
|
General Warning (Battery, Connectivity, or Maintenance) | View Details |
| – |
Thermostat frequently loses connection to the Delta Dore Tydom gateway; app shows device offline intermittently.
|
Intermittent RF / IP Connectivity | View Details |
| – |
Thermostat or receiver emits a constant clicking noise as the relay switches rapidly.
|
Relay Chatter Due to Unstable Control Signal | View Details |
| – |
Thermostat or receiver feels unusually hot to the touch during normal operation.
|
Overheating of Internal Components | View Details |
| – |
Thermostat powers on but does not call for heat; boiler or receiver never activates even when setpoint is higher than room temperature.
|
No Heat Demand Output | View Details |
| – |
Thermostat randomly resets to factory settings, losing schedules and configuration.
|
Intermittent Memory or Power Glitch | View Details |
| – |
Thermostat shows temperature much higher or lower than actual room temperature, causing poor comfort.
|
Incorrect Temperature Measurement | View Details |
| – |
Thermostat shows Wi‑Fi or cloud icon with a cross; remote control via smartphone app does not work, but local control is fine.
|
Cloud / Remote Access Failure | View Details |
| – |
Underfloor heating controlled by the thermostat is slow to respond or never reaches set temperature.
|
Underfloor Heating Control or Sensor Misconfiguration | View Details |
No matching codes found
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