Vokera Fault Codes: Meanings, Causes & How to Fix Them
If your boiler suddenly stops working and displays an error, understanding Vokera fault codes can help you quickly identify the issue and take the right action.
Vokera boilers are known for reliability, but like any heating system, they can develop faults. These codes are designed to pinpoint specific problems, ranging from minor issues you can fix yourself to more serious faults requiring a Gas Safe engineer.
In this guide, we’ll explain the most common Vokera fault codes, their causes, and step-by-step solutions.
Table of contents
Why Vokera Fault Codes Matter
When a fault occurs, your boiler may enter lockout mode (often indicated by a flashing red light). This is a safety feature to prevent further damage or risks such as gas leaks or overheating.
Understanding these codes allows you to:
- Diagnose problems quickly
- Perform basic troubleshooting
- Know when to call a professional
Common Vokera Fault Codes and Their Meanings
General Status Codes
| Code | Meaning |
| _St | Auto-stop activated |
| CL | Call for service |
| P | Preheating active |
| Hours | Standby mode |
| — | Boiler off |
A Series Error Codes
These are among the most common Vokera fault codes:
A01 – Ignition Failure
Flame not detected; could be gas supply or ignition issue
A02 – Thermostat Fault
Problem with the limit thermostat
A03 – Fan Fault
Fan not operating correctly (requires engineer)
A04 – Low Water Pressure
System pressure too low
A06 – DHW Thermistor Fault
Hot water temperature sensor issue
A07 / A08 – Temperature Faults
Overheating in flow or return water
A09 – Flue Thermistor Fault
Problem with flue temperature monitoring
Vokera Mynute Error Codes
AL10, AL20, AL21, AL26, AL28, AL34
Try resetting the boiler
AL40 / AL41
Low pressure; refill system and reset
AL52, AL55, AL60, AL71, AL73, AL74, AL79
Require professional diagnosis
Evolve Boiler Error Codes
E10 – Flame Lockout
Ignition or flame detection problem
E020 – Thermostat Fault
Overheating or sensor issue
E030 – Fan Fault
Fan malfunction
E040–E042 – Water Pressure/Transducer Fault
Check system pressure
E060 – Hot Water Probe Fault
Sensor issue
E090 – Flue Overheating
High flue gas temperature
E091 – Heat Exchanger Blockage
Requires cleaning
E058 – Voltage Issue
Power supply fault
E085 / E094 / E095 – Combustion Fault
Potentially dangerous call an engineer immediately
Step-by-Step Fix for Vokera Fault Codes
Time needed: 5 minutes
Before calling an engineer, try these safe troubleshooting steps:
- Reset the Boiler
Locate the reset button
Hold for a few seconds
Allow the system to restart - Check Water Pressure
Ideal range: 1.0–1.5 bar
If low, top up using the filling loop - Check Gas Supply
Ensure gas is turned on
Test other appliances like your hob - Inspect for Obvious Issues
Frozen condensate pipe
Blocked vents or flue
Power supply interruptions - Call a Gas Safe Engineer
If the fault persists or involves internal components (fan, PCB, gas valve), contact a Gas Safe registered engineer.
Never attempt internal boiler repairs yourself.
When to Call a Professional
You should always seek expert help if:
- The fault code keeps returning
- The boiler enters lockout mode repeatedly
- You see combustion or gas-related errors
- There are unusual noises or smells
Conclusion
Understanding Vokera fault codes can save you time, stress, and money. While some issues like low pressure can be resolved quickly at home, others require professional expertise.
Acting promptly ensures your boiler remains safe, efficient, and reliable, keeping your home warm all year round.
Frequently Asked Questions
To reset a Vokera boiler, turn the mode selector dial to the OFF/RESET position, wait 5 to 10 seconds, and turn it back to its original setting (e.g., ‘Hot Water Only’ or ‘Heating and Hot Water’). Alternatively, if your model has a dedicated button, press and hold the Reset button for 3 to 5 seconds.
Boiler error codes are diagnostic messages displayed on your heating system that point to specific malfunctions like low pressure, ignition failure, or overheating. Because codes vary heavily by brand, you must find your boiler’s exact make and model to understand the specific problem and perform a safe repair.
If your Vokera boiler is not firing up, the most common culprits are low system pressure (below 1 bar), ignition failure (Error A01), or a frozen condensate pipe in winter. You can often fix pressure or reset issues yourself, but gas or ignition component faults require a professional.
On Vokera boilers, Error 10 (or Fault 10) typically indicates an ignition failure. It means the boiler is trying to spark but cannot successfully ignite the gas to create a flame.
To turn on a Vokera boiler, ensure the power and gas supplies are active. Set the mode switch to the desired setting (Hot Water Only, or Heating and Hot Water), and confirm your external thermostat and timer are calling for heat.
