Drayton
Drayton 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
The thermostat display shows E1, and heating will not turn on or off from the thermostat.
Open Circuit Room Temperature Sensor
E10
Thermostat shows E10 and cannot connect to Wi‑Fi or the Drayton Wiser HubR.
Wi‑Fi / Network Module Fault
E11
Thermostat shows E11 and cannot join the Wiser Zigbee network; smart radiator thermostats do not respond.
Zigbee Mesh Communication Fault
E12
Thermostat shows E12 and schedules cannot be saved or edited reliably.
Configuration Storage Error
E13
Thermostat shows E13 and cannot detect or control connected zone valve or boiler relay.
Load Detection / Output Monitoring Fault
E14
Thermostat shows E14 and the backlight or display is partially blank or flickering.
LCD / Display Interface Fault
E15
Thermostat shows E15 and cannot complete firmware update via the Wiser app.
Firmware Update Failure
E16
Thermostat shows E16 and battery icon flashes even with new batteries fitted.
Battery Sensing Circuit Fault
E17
The thermostat displays E17 and cannot communicate with the boiler interface module.
Boiler Interface Communication Fault
E18
The thermostat displays E18, and geofencing or cloud services are unavailable.
Cloud Service / Account Communication Error
E19
The thermostat displays E19 and cannot join the user’s account; pairing via QR code fails repeatedly.
Device Registration / Identity Fault
E2
The thermostat shows E2 and reports an incorrect room temperature (very high or very low) while heating behaves erratically.
Short Circuit Room Temperature Sensor
E20
The thermostat displays E20 and cannot control smart radiator thermostats (TRVs) in the same room.
Room Linking / Binding Fault
E3
The thermostat displays E3 and cannot control hot water temperature from the cylinder sensor.
Cylinder Sensor Fault (Open or Short)
E4
The thermostat shows E4, and the backlight may flash; the device reboots intermittently.
Internal Power Supply Fault
E5
The thermostat shows E5 and cannot control heating; the relay in the receiver does not click.
Relay Drive or Output Fault
E6
The thermostat shows E6 and cannot complete pairing or loses connection immediately after pairing.
RF Module Hardware Fault
E7
Thermostat shows E7 and time/programming resets unexpectedly.
Internal Memory or RTC Fault
E8
Thermostat shows E8 and backlight may dim; device feels unusually warm to the touch.
Overtemperature Protection Triggered (Internal)
E9
Thermostat shows E9 and cannot detect external floor sensor in underfloor heating setup.
Floor Sensor Fault (Open/Short or Not Detected)
Symptom
Condensation or visible moisture inside thermostat display or housing.
Moisture Ingress into Thermostat
Symptom
Room never reaches the set temperature; the thermostat shows demand, but the room stays cold.
Underheating / Insufficient Heat Output
Symptom
Smart radiator thermostats (TRVs) heat when they should be off, despite the room thermostat being satisfied.
TRV Control / Binding Error
Symptom
The boiler runs continuously and does not turn off even when the thermostat is satisfied or turned down.
Stuck Heating Relay or Permanent Live Fault
Symptom
The room temperature overshoots the setpoint by several degrees before the heating turns off.
Poor Temperature Control / Overshoot
Symptom
The thermostat appears to work, but the boiler never fires for heating demand.
No Heat Demand Output from Thermostat System
Symptom
The thermostat backlight flickers or dims when the boiler or pump starts.
Electrical Noise / Supply Disturbance
Symptom
The thermostat display is completely blank and unresponsive; heating does not respond to thermostat changes.
No Power to Thermostat
Symptom
The thermostat display is on but does not respond to button presses or touchscreen taps.
User Interface / Keypad Failure
Symptom
The thermostat frequently loses its wireless connection to the receiver; heating drops out intermittently.
Unstable RF Link Between Thermostat and Receiver
Symptom
The thermostat or Wiser app does not follow the programmed schedule; heating comes on at the wrong times.
Scheduling / Program Logic Fault
Symptom
The thermostat or Wiser app intermittently shows the boiler as offline or not responding.
Intermittent Boiler Interface Communication
Symptom
The thermostat or Wiser app reports very low signal strength to certain TRVs or room thermostats.
Weak Zigbee Mesh Coverage
Symptom
The thermostat or Wiser app shows heating on, but radiators are only lukewarm and the boiler cycles rapidly.
Short Cycling / Incorrect Control Configuration
Symptom
The thermostat or Wiser app shows hot water on, but the cylinder does not heat.
Hot Water Control Failure
Symptom
The thermostat shows a much higher or lower temperature than the actual room temperature.
Temperature Measurement Inaccuracy
Symptom
The thermostat time and schedules drift or reset after power cuts.
Timekeeping / Backup Power Issue
Symptom
Thermostat emits a faint buzzing or clicking noise during operation.
Audible Noise from Relay or Electronics
Symptom
Thermostat plastic housing becomes noticeably warm during normal operation.
Thermostat Overheating (Mechanical/Installation)
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
The thermostat display shows E1, and heating will not turn on or off from the thermostat.
|
Open Circuit Room Temperature Sensor | View Details |
| E10 |
Thermostat shows E10 and cannot connect to Wi‑Fi or the Drayton Wiser HubR.
|
Wi‑Fi / Network Module Fault | View Details |
| E11 |
Thermostat shows E11 and cannot join the Wiser Zigbee network; smart radiator thermostats do not respond.
|
Zigbee Mesh Communication Fault | View Details |
| E12 |
Thermostat shows E12 and schedules cannot be saved or edited reliably.
|
Configuration Storage Error | View Details |
| E13 |
Thermostat shows E13 and cannot detect or control connected zone valve or boiler relay.
|
Load Detection / Output Monitoring Fault | View Details |
| E14 |
Thermostat shows E14 and the backlight or display is partially blank or flickering.
|
LCD / Display Interface Fault | View Details |
| E15 |
Thermostat shows E15 and cannot complete firmware update via the Wiser app.
|
Firmware Update Failure | View Details |
| E16 |
Thermostat shows E16 and battery icon flashes even with new batteries fitted.
|
Battery Sensing Circuit Fault | View Details |
| E17 |
The thermostat displays E17 and cannot communicate with the boiler interface module.
|
Boiler Interface Communication Fault | View Details |
| E18 |
The thermostat displays E18, and geofencing or cloud services are unavailable.
|
Cloud Service / Account Communication Error | View Details |
| E19 |
The thermostat displays E19 and cannot join the user’s account; pairing via QR code fails repeatedly.
|
Device Registration / Identity Fault | View Details |
| E2 |
The thermostat shows E2 and reports an incorrect room temperature (very high or very low) while heating behaves erratically.
|
Short Circuit Room Temperature Sensor | View Details |
| E20 |
The thermostat displays E20 and cannot control smart radiator thermostats (TRVs) in the same room.
|
Room Linking / Binding Fault | View Details |
| E3 |
The thermostat displays E3 and cannot control hot water temperature from the cylinder sensor.
|
Cylinder Sensor Fault (Open or Short) | View Details |
| E4 |
The thermostat shows E4, and the backlight may flash; the device reboots intermittently.
|
Internal Power Supply Fault | View Details |
| E5 |
The thermostat shows E5 and cannot control heating; the relay in the receiver does not click.
|
Relay Drive or Output Fault | View Details |
| E6 |
The thermostat shows E6 and cannot complete pairing or loses connection immediately after pairing.
|
RF Module Hardware Fault | View Details |
| E7 |
Thermostat shows E7 and time/programming resets unexpectedly.
|
Internal Memory or RTC Fault | View Details |
| E8 |
Thermostat shows E8 and backlight may dim; device feels unusually warm to the touch.
|
Overtemperature Protection Triggered (Internal) | View Details |
| E9 |
Thermostat shows E9 and cannot detect external floor sensor in underfloor heating setup.
|
Floor Sensor Fault (Open/Short or Not Detected) | View Details |
| – |
Condensation or visible moisture inside thermostat display or housing.
|
Moisture Ingress into Thermostat | View Details |
| – |
Room never reaches the set temperature; the thermostat shows demand, but the room stays cold.
|
Underheating / Insufficient Heat Output | View Details |
| – |
Smart radiator thermostats (TRVs) heat when they should be off, despite the room thermostat being satisfied.
|
TRV Control / Binding Error | View Details |
| – |
The boiler runs continuously and does not turn off even when the thermostat is satisfied or turned down.
|
Stuck Heating Relay or Permanent Live Fault | View Details |
| – |
The room temperature overshoots the setpoint by several degrees before the heating turns off.
|
Poor Temperature Control / Overshoot | View Details |
| – |
The thermostat appears to work, but the boiler never fires for heating demand.
|
No Heat Demand Output from Thermostat System | View Details |
| – |
The thermostat backlight flickers or dims when the boiler or pump starts.
|
Electrical Noise / Supply Disturbance | View Details |
| – |
The thermostat display is completely blank and unresponsive; heating does not respond to thermostat changes.
|
No Power to Thermostat | View Details |
| – |
The thermostat display is on but does not respond to button presses or touchscreen taps.
|
User Interface / Keypad Failure | View Details |
| – |
The thermostat frequently loses its wireless connection to the receiver; heating drops out intermittently.
|
Unstable RF Link Between Thermostat and Receiver | View Details |
| – |
The thermostat or Wiser app does not follow the programmed schedule; heating comes on at the wrong times.
|
Scheduling / Program Logic Fault | View Details |
| – |
The thermostat or Wiser app intermittently shows the boiler as offline or not responding.
|
Intermittent Boiler Interface Communication | View Details |
| – |
The thermostat or Wiser app reports very low signal strength to certain TRVs or room thermostats.
|
Weak Zigbee Mesh Coverage | View Details |
| – |
The thermostat or Wiser app shows heating on, but radiators are only lukewarm and the boiler cycles rapidly.
|
Short Cycling / Incorrect Control Configuration | View Details |
| – |
The thermostat or Wiser app shows hot water on, but the cylinder does not heat.
|
Hot Water Control Failure | View Details |
| – |
The thermostat shows a much higher or lower temperature than the actual room temperature.
|
Temperature Measurement Inaccuracy | View Details |
| – |
The thermostat time and schedules drift or reset after power cuts.
|
Timekeeping / Backup Power Issue | View Details |
| – |
Thermostat emits a faint buzzing or clicking noise during operation.
|
Audible Noise from Relay or Electronics | View Details |
| – |
Thermostat plastic housing becomes noticeably warm during normal operation.
|
Thermostat Overheating (Mechanical/Installation) | View Details |
No matching codes found
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