Vokera A01 Fault Code: Causes and Step-by-Step Fix Guide
If your boiler is displaying the Vokera A01 fault code, it indicates an ignition failure. In simple terms, your boiler has attempted to ignite but failed to detect a flame, causing it to lock out as a safety precaution.
This is a common issue with Vokera boilers, and in many cases, it can be resolved with a few basic checks. In this guide, we’ll cover the causes of the Vokera A01 fault code and provide step-by-step solutions to get your heating back up and running.
Table of contents
What Does the Vokera A01 Fault Code Mean?
The Vokera A01 fault code means the boiler cannot ignite the burner or detect a flame after ignition. To prevent unburned gas from accumulating, the boiler automatically shuts down (lockout mode).
This fault is usually linked to gas supply issues, ignition components, or internal boiler parts.
Common Causes of the Vokera A01 Fault Code
Based on manufacturer documentation and widely referenced heating industry sources, the most common causes include:
No Gas Supply
- Gas valve turned off
- Prepayment meter out of credit
- Temporary supply interruption
Frozen Condensate Pipe
In winter, the external condensate pipe can freeze, blocking wastewater flow and preventing the boiler from firing.
Dirty or Faulty Flame Sensor / Electrode
- Carbon buildup or corrosion
- Prevents flame detection or ignition spark
Gas Valve or PCB Failure
- Faulty gas valve restricting gas flow
- Defective PCB (Printed Circuit Board) disrupting ignition sequence
Step-by-Step Fix for Vokera A01 Fault Code
Time needed: 5 minutes
Before calling an engineer, follow these troubleshooting steps:
- Check Your Gas Supply
Ensure the main gas valve is turned on
Test other appliances (e.g., gas hob)
Check your meter has sufficient credit - Inspect the Condensate Pipe
Locate the external plastic pipe from your boiler
If frozen, pour warm (not boiling) water over it
Ensure the blockage is cleared - Reset the Boiler
Turn the control knob to the reset position (usually fully anti-clockwise)
Hold for 3–5 seconds
Return it to normal settings and allow the boiler to restart
Only attempt a reset once or twice. Repeated resets can worsen the issue. - Observe Boiler Operation
Listen for ignition attempts (clicking sounds)
Check if the boiler fires up normally
If the fault returns, further internal diagnosis is required. - Call a Gas Safe Registered Engineer
If the Vokera A01 fault code persists, contact a qualified professional. An engineer will:
Clean or replace the flame sensor
Inspect ignition electrodes
Test the gas valve and PCB
Ensure safe and compliant operation
Never attempt to open or repair internal boiler components yourself.
How to Prevent the Vokera A01 Fault Code
- Schedule annual boiler servicing
- Insulate condensate pipes to prevent freezing
- Ensure consistent gas supply
- Address minor faults early
Conclusion
The Vokera A01 fault code is a safety shutdown caused by ignition failure. While simple issues like gas supply or frozen pipes can often be resolved quickly, persistent faults usually require professional repair.
Acting promptly ensures your boiler remains safe, efficient, and reliable, especially during colder months.
Frequently Asked Questions
An A01 boiler fault (common in brands like Vokera) means ignition failure. The boiler tried to light the burner but couldn’t sense a flame, so it shut down for safety. Common causes include a disrupted gas supply, dirty ignition electrodes, a faulty gas valve, or a frozen condensate pipe.
To reset a Vokera boiler, locate the mode selector dial and turn it to the ‘OFF/RESET’ position. Hold it there for 5 to 10 seconds, then turn it back to your desired heating or hot water mode. Alternatively, if your model has a dedicated reset (R) button, press and hold it for 3 to 5 seconds.
The reason your Vokera boiler is not firing up may be due to various factors such as a lack of power, low pressure, or issues with the thermostat. Check these elements before seeking professional assistance if the problem persists.
