Vokera Fault Codes
Searchable list
Boilers covered:
- Linea and Linea One
- Unica and Unica i
- Compact and Compact HE
- ProCombi
- Verve
- Vokera Vision 25C / 30C Combi
- Vokera Vision 20S / 30S System
- Vokera Mynute (digital-display models)
- Vokera Easi-Heat Plus Combi / System / Open Vent
- Vokera Easi-Heat i
- Vokera Vision Plus 20S / 25S / 30S
Note: Low-pressure codes (A04, E040, AL40) are often user-fixable. Most others require a Gas Safe engineer.
Modern Codes (A-series / E-series Evolve)
| Error code | Possible fault | If ticked try the troubleshooter |
|---|---|---|
| A01 | Ignition failure / flame not detected | ✓ |
| A02 | Limit thermostat fault / overheat | ✕ |
| A03 | Fan fault | ✕ |
| A04 | Insufficient system water pressure | ✓ |
| A06 | DHW thermistor fault | ✕ |
| A07 | Primary flow thermistor fault | ✕ |
| A08 | Return thermistor fault | ✕ |
| A09 | Flue thermistor fault | ✕ |
| A11 | False flame detected | ✕ |
| A77 | Low temperature thermostat fault | ✕ |
| E010 | Flame lockout | ✓ |
| E011 | Extraneous / parasitic flame | ✕ |
| E012 | Maximum number of flame losses | ✓ |
| E020 | Limit thermostat fault | ✕ |
| E030 | Fan fault | ✕ |
| E040 | Low water pressure | ✓ |
| E041 | Water pressure fault | ✓ |
| E042 | Water transducer fault | ✕ |
| E060 | DHW probe fault | ✕ |
| E070 | Flow temperature sensor fault | ✕ |
| E080 | Return line probe over temperature | ✕ |
| E090 | Flue gases over temperature | ✕ |
| E091 | Clean primary heat exchanger | ✕ |
| _St | Autostop | ✕ |
| _CL | Call for service | ✕ |
| ADJ | Calibration | ✕ |
| ACO | Service operation | ✕ |
| P | Preheating function active | ✕ |
| Hours | Stand-by | ✕ |
Classic Codes (AL-series Mynute / numeric)
| Error code | Possible fault | If ticked try the troubleshooter |
|---|---|---|
| 01 | Failure to ignite | ✓ |
| 02 | Overheat | ✕ |
| 03 | Fan/flue problem | ✕ |
| 04 | Insufficient water pressure | ✓ |
| 05 | PCB fault | ✕ |
| 06 | Hot water thermistor open circuit | ✕ |
| 07 | Primary thermistor open circuit | ✕ |
| AL10 | Ignition failure / condensate sensor activated | ✓ |
| AL20 | Limit thermostat fault | ✕ |
| AL21 | External device fault | ✕ |
| AL26 | Return temperature too high | ✕ |
| AL28 | Temperature differential inverted | ✕ |
| AL34 | Fan tacho signal fault | ✕ |
| AL40 | Low system pressure | ✓ |
| AL41 | Pressure fault | ✓ |
| AL52 | Internal fault | ✕ |
| AL55 | Jumper tag fault | ✕ |
| AL60 | Jumper tag fault | ✕ |
| AL71 | Primary (flow) thermistor fault | ✕ |
| AL73 | Return thermistor fault | ✕ |
| AL74 | No water circulation | ✓ |
| AL79 | Flow temperature too high | ✕ |