Vokera is a British boiler manufacturer based in Hertfordshire, founded in 1985. Known for producing reliable, affordable combi and system boilers, they are popular in the UK rental market. Vokera fault codes use ‘A’ for lockout faults and numerical codes for status/blocking conditions.
Vokera Boiler Fault Codes
All Vokera Fault Codes 39
| Code | Fault | Severity | Type | View guide |
|---|---|---|---|---|
| 01 | Failure to Ignite (Simple Display) On Vokera boilers with simpler displays, code 01 indicates the boiler has failed to ignite. | Medium | DIY Check | View Guide |
| 02 | Overheat (Simple Display) On Vokera boilers with simpler displays, code 02 indicates the boiler has overheated. | High | Engineer | View Guide |
| 03 | Fan/Flue Problem (Simple Display) On Vokera boilers with simpler displays, code 03 indicates a problem with the fan or… | High | Engineer | View Guide |
| 04 | Low Water Pressure (Simple Display) On Vokera boilers with simpler displays, code 04 indicates insufficient water pressure. | Low | DIY Check | View Guide |
| 05 | Fan Fault Fan not operating correctly. | High | Engineer | View Guide |
| 06 | Air Pressure Switch APS not detecting airflow. | High | Engineer | View Guide |
| 07 | Overheat Boiler exceeded safe temperature. | High | Engineer | View Guide |
| 08 | NTC Fault A temperature sensor has failed. | Medium | Engineer | View Guide |
| 09 | Gas Valve Gas valve not responding. | High | Engineer | View Guide |
| 10 | Low Pressure System pressure too low. | Low | DIY Check | View Guide |
| 11 | Pump Fault Pump not running. | High | Engineer | View Guide |
| 12 | Condensate Condensate pipe blocked. | Medium | DIY Check | View Guide |
| A01 | Ignition Failure The boiler has failed to ignite — the flame was not sensed during the ignition… | Medium | DIY Check | View Guide |
| A02 | Limit Thermostat Fault The safety limit thermostat has activated or has a fault. This can indicate the boiler… | High | Engineer | View Guide |
| A03 | Fan Fault The boiler fan is not operating correctly — it may not be starting, running too… | High | Engineer | View Guide |
| A04 | Low Water Pressure The system water pressure is insufficient for safe operation. The most common easily-fixable Vokera fault. | Low | DIY Check | View Guide |
| A05 | Fan Fault The fan is not running at the correct speed. | High | Engineer | View Guide |
| A06 | DHW Thermistor Fault The domestic hot water temperature sensor has a fault — open circuit, short circuit, or… | Medium | Engineer | View Guide |
| A07 | Primary Flow Thermistor Fault The primary heating flow temperature sensor has a fault — the water temperature is reading… | Medium | Engineer | View Guide |
| A08 | Return Thermistor Fault The return temperature sensor has a fault — the return water temperature is reading too… | Medium | Engineer | View Guide |
| A09 | Flue Thermistor Fault The flue gas temperature sensor has a fault, or there may be a flue thermostat… | High | Engineer | View Guide |
| A10 | Return NTC Fault The return NTC sensor is faulty. | Medium | Engineer | View Guide |
| A11 | False Flame Detected The boiler is detecting a flame signal when none should be present. A serious safety… | High | Engineer | View Guide |
| A12 | DHW NTC Fault The hot water NTC sensor is faulty. | Medium | Engineer | View Guide |
| A13 | Low Water Pressure System pressure is too low. | Low | DIY Check | View Guide |
| A14 | Rapid Temperature Rise Flow temperature rising too fast. | High | Engineer | View Guide |
| A15 | Condensate Blocked The condensate drain is blocked or frozen. | Medium | DIY Check | View Guide |
| A16 | Gas Valve Fault The gas valve is not responding. | High | Engineer | View Guide |
| A17 | PCB Fault Internal PCB error. | High | Engineer | View Guide |
| A18 | Overheat Protection Safety thermostat activated. | High | Engineer | View Guide |
| A19 | Diverter Valve Fault The valve is stuck. | Medium | Engineer | View Guide |
| A20 | Pump Fault The pump is not running. | High | Engineer | View Guide |
| AL40 | Low Water Pressure (Mynute) On Vokera Mynute boilers, AL40 indicates low system water pressure. | Low | DIY Check | View Guide |
| AL41 | Very Low Water Pressure (Mynute) On Vokera Mynute boilers, AL41 indicates critically low system water pressure. | Medium | DIY Check | View Guide |
| E011 | Extraneous Flame (Evolve) On Vokera Evolve boilers, E011 indicates an extraneous (false) flame has been detected when the… | High | Engineer | View Guide |
| E020 | Limit Thermostat / Overheat (Evolve) On Vokera Evolve boilers, E020 indicates the limit thermostat has been activated due to overheating. | High | Engineer | View Guide |
| E030 | Fan Fault (Evolve) On Vokera Evolve boilers, E030 indicates a fan fault. | High | Engineer | View Guide |
| E040 | Low Water Pressure (Evolve) On Vokera Evolve boilers, E040 indicates low system water pressure via the water transducer. | Low | DIY Check | View Guide |
| E10 | Flame Lockout (Evolve) On Vokera Evolve boilers, E10 indicates a flame lockout — the boiler has failed to… | Medium | DIY Check | View Guide |