Vokera
Vokera 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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A01
The thermostat shows A01 and the boiler does not fire for heating or hot water demand.
No flame detected / ignition lockout request from boiler
A03
Thermostat shows A03 and heating shuts down unexpectedly
Overheat lockout reported by boiler to thermostat
A04
Thermostat displays A04 and heating is disabled
Low system water pressure reported by boiler
A06
Thermostat shows A06 and boiler cycles off shortly after starting
Flame instability / flame detection fault reported by boiler
A41
Thermostat shows A41 and heating demand is ignored
Flow temperature sensor fault reported by boiler
A77
Thermostat displays A77 and heating is unavailable
Flue gas sensor / safety device fault reported by boiler
E01
Vokera smart thermostat shows E01 and will not control heating
Internal thermostat temperature sensor fault
E02
Thermostat displays E02 and shows no room temperature reading
Remote sensor fault (if using external room or floor sensor)
E03
Thermostat shows E03 and cannot connect to boiler via OpenTherm
OpenTherm communication failure between thermostat and boiler
E04
Thermostat displays E04 and cannot connect to Wi‑Fi network
Wi‑Fi module connection failure
E05
Thermostat shows E05 and cannot reach Vokera cloud / app control not working
Cloud connectivity / server communication error
E06
Thermostat displays E06 and does not respond to touch or button presses reliably
User interface / touch panel fault
E07
Thermostat shows E07 and frequently reboots or loses power
Power supply / low-voltage input fault
E08
Thermostat displays E08 and cannot pair with the wireless receiver at the boiler
RF communication failure between thermostat and receiver
E09
Thermostat shows E09 and schedules or settings are lost after power cuts
Non-volatile memory / backup power fault
E10
Thermostat displays E10 and cannot control hot water function
Hot water control channel fault / DHW relay or output error
E11
Thermostat shows E11 and heating remains on constantly, ignoring setpoint
Heating relay stuck closed / output fault
E12
Thermostat displays E12 and time or date cannot be set or keeps reverting
Real-time clock (RTC) failure
E13
Thermostat shows E13 and cannot complete firmware update
Firmware update / flash write error
E20
Thermostat displays E20 and room temperature swings widely around setpoint
Control algorithm / sensor calibration error
E30
Thermostat shows E30 and cannot detect boiler status feedback
Boiler feedback / status line communication fault
Symptom
Heating does not come on at scheduled times, but works when manually overridden.
Programming/schedule configuration fault.
Symptom
Room temperature never reaches the setpoint even though the thermostat shows a heating demand.
Underheating due to incorrect thermostat configuration or placement.
Symptom
The boiler runs when there is no apparent demand from the thermostat.
Unintended boiler firing due to wiring or control conflict.
Symptom
The thermostat clicks or the relay chatters rapidly when calling for heat.
Relay chatter/unstable control signal.
Symptom
The thermostat display is completely blank and unresponsive.
No power to the thermostat.
Symptom
The thermostat display is very dim or the backlight flickers.
Display backlight/power regulation issue.
Symptom
The thermostat emits a burning smell or becomes unusually hot to the touch.
Overheating of internal components.
Symptom
The thermostat frequently loses connection to the wireless receiver, causing intermittent heating.
Intermittent RF communication/range issue.
Symptom
The thermostat plastic housing is cracked or damaged after impact.
Mechanical damage to the thermostat enclosure.
Symptom
The thermostat shows a much higher or lower room temperature than actual.
Temperature measurement inaccuracy/sensor misplacement.
Symptom
Thermostat app shows incorrect room name or zone mapping.
Zone configuration/mapping error.
Symptom
Thermostat buttons or dial are stiff or jammed.
Mechanical control obstruction.
Symptom
Thermostat causes boiler to short-cycle (frequent on/off) even when the house is not warm.
Short cycling due to control settings or system mismatch.
Symptom
Thermostat does not respond to app commands, but the app shows it as online.
Cloud-to-device command handling fault.
Symptom
Thermostat does not switch to summer mode; heating comes on even in warm weather.
Seasonal mode/temperature threshold misconfiguration.
Symptom
Thermostat frequently disconnects from Wi-Fi but continues to control heating locally.
Unstable Wi-Fi connection.
Symptom
Thermostat shows an error or misbehaves after a power surge or lightning storm.
Surge damage to thermostat electronics.
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| A01 |
The thermostat shows A01 and the boiler does not fire for heating or hot water demand.
|
No flame detected / ignition lockout request from boiler | View Details |
| A03 |
Thermostat shows A03 and heating shuts down unexpectedly
|
Overheat lockout reported by boiler to thermostat | View Details |
| A04 |
Thermostat displays A04 and heating is disabled
|
Low system water pressure reported by boiler | View Details |
| A06 |
Thermostat shows A06 and boiler cycles off shortly after starting
|
Flame instability / flame detection fault reported by boiler | View Details |
| A41 |
Thermostat shows A41 and heating demand is ignored
|
Flow temperature sensor fault reported by boiler | View Details |
| A77 |
Thermostat displays A77 and heating is unavailable
|
Flue gas sensor / safety device fault reported by boiler | View Details |
| E01 |
Vokera smart thermostat shows E01 and will not control heating
|
Internal thermostat temperature sensor fault | View Details |
| E02 |
Thermostat displays E02 and shows no room temperature reading
|
Remote sensor fault (if using external room or floor sensor) | View Details |
| E03 |
Thermostat shows E03 and cannot connect to boiler via OpenTherm
|
OpenTherm communication failure between thermostat and boiler | View Details |
| E04 |
Thermostat displays E04 and cannot connect to Wi‑Fi network
|
Wi‑Fi module connection failure | View Details |
| E05 |
Thermostat shows E05 and cannot reach Vokera cloud / app control not working
|
Cloud connectivity / server communication error | View Details |
| E06 |
Thermostat displays E06 and does not respond to touch or button presses reliably
|
User interface / touch panel fault | View Details |
| E07 |
Thermostat shows E07 and frequently reboots or loses power
|
Power supply / low-voltage input fault | View Details |
| E08 |
Thermostat displays E08 and cannot pair with the wireless receiver at the boiler
|
RF communication failure between thermostat and receiver | View Details |
| E09 |
Thermostat shows E09 and schedules or settings are lost after power cuts
|
Non-volatile memory / backup power fault | View Details |
| E10 |
Thermostat displays E10 and cannot control hot water function
|
Hot water control channel fault / DHW relay or output error | View Details |
| E11 |
Thermostat shows E11 and heating remains on constantly, ignoring setpoint
|
Heating relay stuck closed / output fault | View Details |
| E12 |
Thermostat displays E12 and time or date cannot be set or keeps reverting
|
Real-time clock (RTC) failure | View Details |
| E13 |
Thermostat shows E13 and cannot complete firmware update
|
Firmware update / flash write error | View Details |
| E20 |
Thermostat displays E20 and room temperature swings widely around setpoint
|
Control algorithm / sensor calibration error | View Details |
| E30 |
Thermostat shows E30 and cannot detect boiler status feedback
|
Boiler feedback / status line communication fault | View Details |
| – |
Heating does not come on at scheduled times, but works when manually overridden.
|
Programming/schedule configuration fault. | View Details |
| – |
Room temperature never reaches the setpoint even though the thermostat shows a heating demand.
|
Underheating due to incorrect thermostat configuration or placement. | View Details |
| – |
The boiler runs when there is no apparent demand from the thermostat.
|
Unintended boiler firing due to wiring or control conflict. | View Details |
| – |
The thermostat clicks or the relay chatters rapidly when calling for heat.
|
Relay chatter/unstable control signal. | View Details |
| – |
The thermostat display is completely blank and unresponsive.
|
No power to the thermostat. | View Details |
| – |
The thermostat display is very dim or the backlight flickers.
|
Display backlight/power regulation issue. | View Details |
| – |
The thermostat emits a burning smell or becomes unusually hot to the touch.
|
Overheating of internal components. | View Details |
| – |
The thermostat frequently loses connection to the wireless receiver, causing intermittent heating.
|
Intermittent RF communication/range issue. | View Details |
| – |
The thermostat plastic housing is cracked or damaged after impact.
|
Mechanical damage to the thermostat enclosure. | View Details |
| – |
The thermostat shows a much higher or lower room temperature than actual.
|
Temperature measurement inaccuracy/sensor misplacement. | View Details |
| – |
Thermostat app shows incorrect room name or zone mapping.
|
Zone configuration/mapping error. | View Details |
| – |
Thermostat buttons or dial are stiff or jammed.
|
Mechanical control obstruction. | View Details |
| – |
Thermostat causes boiler to short-cycle (frequent on/off) even when the house is not warm.
|
Short cycling due to control settings or system mismatch. | View Details |
| – |
Thermostat does not respond to app commands, but the app shows it as online.
|
Cloud-to-device command handling fault. | View Details |
| – |
Thermostat does not switch to summer mode; heating comes on even in warm weather.
|
Seasonal mode/temperature threshold misconfiguration. | View Details |
| – |
Thermostat frequently disconnects from Wi-Fi but continues to control heating locally.
|
Unstable Wi-Fi connection. | View Details |
| – |
Thermostat shows an error or misbehaves after a power surge or lightning storm.
|
Surge damage to thermostat electronics. | View Details |
No matching codes found
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