Vokera boiler fault codes
Vokera boilers show an A followed by two numbers, such as A01 or A04. These meanings come from Vokera's own manuals for the Vision and Compact A.
Before you call anyone
A01 (ignition failure) and A04 (low water pressure) are the Vokera codes you're most likely to see. Vokera's manuals say both can be reset after the cause is dealt with.
| Code | What it means | Models | Can you fix it? |
|---|---|---|---|
| A01 | Ignition failure, flame not sensed. | Vision and Compact A | Checks first |
| A04 | Insufficient system water pressure. | Vision and Compact A | Usually yes |
| A02 | Limit thermostat fault. | Vision and Compact A | Checks first |
| A03 | Fan tacho signal fault. | Vision and Compact A | Checks first |
| A06 | Hot water (DHW) thermistor fault. | Vision and Compact A | No, engineer only |
| A07 | Primary (flow) thermistor fault. | Vision and Compact A | No, engineer only |
| A08 | Return thermistor fault. | Vision and Compact A | No, engineer only |
| A09 | Flue thermistor fault. | Vision and Compact A | No, engineer only |
| A77 | Low temperature thermostat fault. | Vision and Compact A | No, engineer only |
| A11 | False flame. | Compact A | No, engineer only |
| CL | Call for service. | Vision and Compact A | No, engineer only |
| St | Autostop. | Vision and Compact A | No, engineer only |
Sources
- Vokera Vision combi user, installation and servicing instructions
- Vokera Compact A user and installation instructions
Last reviewed October 2026. Spotted something that doesn't match your manual? Email hello@boilercodes.co.uk and we'll check it. How we check