Last Updated on 15 July 2025 by Maelle

IN BRIEF

Error F28 on your Saunier Duval boiler: an ignition problem detected. Prevents ignition, despite start-up attempts. Possible causes: obstruction in the flues or fan failure. Check the boiler’s water pressure.
Make sure the gas supply is turned on. Check the thermostat and D85 settings.Reset the boiler if necessary.
Have you encountered error F28 on your Saunier Duval boiler? Don’t panic, this is a fairly common issue that can freeze your appliance and leave you in the cold. This situation often manifests itself as a message that prevents the boiler from igniting, and it’s important to understand what’s behind this error code. In this guide, we’ll explore the possible causes of this failure and provide you with practical tips to quickly and efficiently restart your boiler. Discover quick and effective solutions for troubleshooting error F28 on Saunier Duval boilers. Take advantage of our expert advice to restore your appliance’s functionality and ensure your thermal comfort. Hi friends! Today, we’re going to talk about a topic that, I admit, can be disruptive in your daily life: the F28 error on your Saunier Duval boiler. Don’t panic, this article is here to help you understand why this error occurs and how to resolve it effectively. So, put on your handyman’s coat and let’s get started! What is error F28 and why does it occur? What does error F28 mean? The error code F28 on a Saunier Duval boiler indicates a problem with the ignition, specifically the flue system. This usually means your boiler is trying to start, but something is blocking the flames! Basically, it’s like trying to start a barbecue in the open air without enough wind. What are the possible causes?Blocked flues:
Debris or soot can block the flue outlet. Fan problem: If the boiler fan isn’t working properly, air can’t circulate as expected.Incorrect pressure:
Low pressure can also cause this problem.Spark plug failure: If the spark plug is damaged, ignition won’t occur.
Reminder: Always check your boiler’s pressure. A pressure between 1 and 1.5 bar is generally recommended! How to diagnose Error F28?
What are the warning signs? Before the error message appears, you may notice certain symptoms. These clues can help you identify the source of the problem:

A strange noise coming from the boiler.A smell of gas or burning. The boiler won’t start despite several attempts. How to diagnose? To make an accurate diagnosis, follow these steps: Check the boiler’s pressure level. Inspect the flue ducts for obstructions. Make sure the fan is working properly. Check the spark plug for cracks.

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What are the solutions to resolve Error F28?

How to clear the flue ducts?For optimal operation of your boiler, flue evacuation is crucial. Here are the steps to take: Unplug the boiler before any work. Inspect and clean the ducts.Use appropriate tools if necessary. How to test the fan?Checking the fan may require a bit more technique. Here are some clues to use:

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Listen to the fan’s noise when starting.

Check for an obstruction.

If nothing works, you may need to consider replacing it. When to call a professional? What are the signs that you need to call a professional? If you’ve tried everything but the error persists, it may be time to move on to the next step: The boiler is acting up again despite all the checks. The spark plug appears damaged. Signs of leakage or corrosion appear.

How to choose a qualified repairer?

You want to avoid scams, right? Here are some criteria for choosing a good repairer: Recommendations from trusted people.
Check online reviews. Make sure they have the necessary certifications.
How to reset your boiler after the F28? What is the reset process?
After fixing the problem, you’ll want to restart your boiler. Here’s how: Check that everything is reassembled and installed correctly.

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Remember to restore the pressure to the correct level. Find the reset button and press it!What are your tips for an effective restart? To restart your boiler smoothly, don’t forget these tips:

Don’t get impatient; wait a few moments before turning it back on.

Set the thermostat to the desired temperature.

Do a final check of the settings before confirming.

What behaviors should you adopt to avoid Error F28 in the future? How to maintain your boiler on a daily basis? Preventative maintenance is often the key! Here are some points to follow:
Check the pressure regularly.
Clear the pipes and don’t hesitate to clean them.

Call a professional for an annual inspection.

What actions should you avoid?

Be careful; certain habits can affect the proper functioning of your boiler:
Don’t ignore unusual noises.
Avoid risky DIY projects. Don’t ignore the warning signs on the boiler display. Fun fact: By taking care of your boiler, not only do you prevent incidents like Error F28, but you also optimize its lifespan and energy efficiency.!
Find out how to quickly resolve the F28 error on your Saunier Duval boiler with our practical tips and troubleshooting tricks. Don’t let the cold catch you by surprise and ensure optimal comfort at home!

FAQs about the F28 error on Saunier Duval boilers

What does the F28 error mean on a Saunier Duval boiler?

The F28 error indicates an ignition problem, usually related to a blockage in the flues or a fan failure. This prevents the boiler from starting properly.

How can I resolve the F28 error on my boiler?
To resolve the F28 error, start by checking the boiler pressure. If the pressure is too low, this may be the cause of the problem. Also, make sure the gas and electricity supplies are turned on, and check that the ignition electrode assembly is working properly.
Should I call a professional to resolve the F28 error? If, after performing the basic checks, your boiler still doesn’t restart, it’s advisable to contact a professional. Some repairs may require specific technical skills to ensure the safety and proper operation of your equipment.

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