Alpha Etec 28 E01 Error: Causes and Solutions

If you own an Alpha Etec 28 boiler, you might occasionally see the E01 error code flashing on your display. This code indicates a problem with the boiler’s ignition or flame detection system. While seeing an error can be stressful, understanding what it means and how to approach it can help you troubleshoot safely or know when to call our engineers.

What Does E01 Mean?

The E01 error is triggered when the boiler fails to ignite or detect a flame during the start-up process. In other words, the boiler is trying to light, but something is preventing it from doing so. Common causes include:

• Blocked or dirty burner or ignition electrodes
• Faulty gas valve or gas supply issues
• Air in the gas line
• Faulty PCB (printed circuit board) or control sensor
• Low water pressure in the system

How to Troubleshoot E01

Before attempting any troubleshooting, always turn off the boiler and isolate the power supply if you plan to inspect components. Some checks can be done safely by homeowners, while others require a Gas Safe registered engineer.

Here are a few steps you can try:

Check the Boiler Reset

• Many Alpha Etec boilers have a reset button. Press and hold it for a few seconds.
• Wait for the boiler to restart and see if the E01 clears.

Inspect Water Pressure

• Low pressure can prevent ignition. Check the pressure gauge on your boiler.
• Ideal pressure is usually 1–1.5 bar when the system is cold.
• If low, top up the system using the filling loop.

Check Gas Supply

• Ensure the gas supply is on at the mains.
• Check for any obvious blockages or leaks (do not attempt DIY repairs on gas lines).

Look at the Flame Sensor and Electrode

• If comfortable, inspect the ignition electrode and flame sensor for dirt or damage.
• Sometimes cleaning the electrode with a soft cloth resolves minor ignition issues.

When to Call the Matt Grange team

If the E01 persists after these steps, it’s time to call our Gas Safe registered engineers. Issues with the gas valve, PCB, or internal electronics should never be attempted by non-professionals, as they involve safety-critical components.

Preventing Future E01 Errors

Regular boiler maintenance can help reduce the chances of ignition problems. Consider:

• Annual servicing by a Gas Safe registered engineer
• Flushing the system periodically to prevent blockages or debris
• Checking system pressure regularly
• Keeping the boiler area clean and free from dust

Key Takeaways

• E01 indicates a flame detection or ignition issue.
• Simple resets, checking water pressure, and ensuring gas supply can sometimes fix it.
• Persistent issues require a professional engineer.
• Regular maintenance reduces risk and extends your boiler’s life.