Ariston Boiler Problems (Error Codes) & Fixes

Ariston boilers are known for their reliability, but like any heating system, they can encounter issues over time. In this guide, we’ll discuss the most common Ariston boiler problems, the corresponding error codes, and potential solutions to help you identify and resolve these issues. From low water pressure to ignition failure, we’ll cover it all, ensuring that you have the information needed to address any problems effectively.

Top Ariston Boiler Problems

Here are the most common Ariston boiler issues, along with their fault codes and potential fixes:

1. Low Water Pressure (Fault Code 108)

One of the most frequent issues with Ariston boilers is low water pressure. The boiler will display fault code 108 when this happens, causing it to stop working or go into lockout mode. Low water pressure is a common problem in many boiler brands, not just Ariston, and typically isn’t a major concern.

However, if the drop in pressure is sudden, it may indicate a more serious issue, such as a leak somewhere in the system. Gradual pressure loss is normal and can be resolved by topping up the system manually.

How to Fix Low Water Pressure in Your Ariston Boiler

To resolve the 108 fault code, you’ll need to increase the water pressure manually. Check the pressure gauge on your boiler — if the needle is below 1, it indicates low pressure. The ideal pressure should be around 1.5, within the green zone on the gauge.

Follow the manufacturer’s instructions for increasing the pressure. Once the correct pressure is reached, restart the boiler. If the issue persists, or if pressure continues to drop, there may be a leak in the system, requiring the attention of a qualified Gas Safe engineer.

2. Failing to Ignite (Fault Codes SP1 or SP2)

An Ariston boiler failing to ignite can be due to several issues, which are usually indicated by fault codes SP1 or SP2. These codes point to ignition failure, which can stem from a variety of problems, such as:

• Faulty ignition leads
• Broken diaphragms or airlocks
• Blocked burner
• Issues with the spark generator
• Low or no gas supply
• Low gas pressure
• Debris in the pilot jet

How to Fix Ignition Failure in an Ariston Boiler

Start by checking the boiler pressure and ensuring that the thermostat is functioning correctly. If these components are in order and the fault persists, you’ll need to call a Gas Safe engineer to diagnose the issue. Ignition problems can be complex and should not be tackled as a DIY project.

3. No Pilot Light (Fault Code 501)

The pilot light is crucial for heating your home. If it fails to ignite or stays off, the boiler won’t be able to heat water or supply heating. On older boilers, you might see the pilot light through a viewing window, but on modern Ariston models, the 501 fault code will notify you of the issue.

Possible causes include:

• Drafts from the flue extinguishing the flame
• A faulty thermocouple
• A blocked gas valve
• A flue blockage

How to Fix No Pilot Light in an Ariston Boiler

Fixing a pilot light issue is not a task for homeowners. You’ll need to call a registered Gas Safe engineer to diagnose and repair the problem safely.

Read more: How Much Does A New Boiler Cost?

4. Printed Circuit Board (PCB) Fault (Fault Codes 301-307)

The PCB is the control center of your Ariston boiler, coordinating the electronic functions of all the components. Fault codes 301 to 307 indicate a problem with the PCB. Common causes include wiring issues, water damage, or component failure.

How to Fix a Faulty PCB in an Ariston Boiler

PCB issues must be addressed by a Gas Safe engineer. If the issue is related to loose wiring, it’s usually a quick fix. However, if the PCB is damaged due to water ingress or electrical failure, a replacement PCB might be necessary.

5. Ariston Fan Fault (Fault Code A41)

The fan in your boiler ensures that harmful gases are vented safely from your home. If the fan fails, the boiler will lock out and display the A41 error code. This fault requires immediate attention, as it poses a significant safety risk.

How to Fix a Faulty Fan in an Ariston Boiler

A qualified engineer will check if the fan is receiving the necessary power supply by using a voltmeter. If the fan is faulty, it will need to be replaced. It’s also a sign that your boiler may be aging, and continuous repairs can become costly. In some cases, replacing the boiler may be the best long-term solution.

Read more about: best boilers in uk

6. Faulty Air Pressure Switch (Fault Code E43)

The air pressure switch, like the fan, is responsible for ensuring that harmful gases are safely vented. If the switch malfunctions, the boiler will lock out, and the E43 error code will appear. This is a serious issue as it indicates that the boiler cannot safely remove exhaust gases, and it must be fixed before the boiler is used again.

How to Fix a Faulty Air Pressure Switch in an Ariston Boiler

The air pressure switch needs to be repaired or replaced by a Gas Safe engineer. In some cases, the problem may also involve the PCB, as these components work together to ensure safe boiler operation. Before ignition, the PCB signals the fan to start, enabling gas to flow into the burner. If the fan or air pressure switch fails, the system won’t ignite, resulting in a lockout.

Read more about: Main Boiler Error Codes / Fault Codes

Do You Need a New Boiler?

If your Ariston boiler frequently experiences problems, it might be time to consider replacing it. As boilers age, they become more prone to issues, and the cost of repairs can add up quickly. A new, energy-efficient boiler can save you money in the long run, as well as improve the reliability of your heating system.

If you’re considering a new boiler, here are a few reasons to get a quote:

• Gas Safe installation within 24 hours: You can have a new boiler installed quickly and safely.
• Trusted service: With thousands of satisfied customers and an average rating of 4.9 on Trustpilot, your new boiler installation will be in safe hands.
• Price match guarantee: If you find a cheaper like-for-like quote, it will be matched.
• Flexible payment options: Interest-free finance and flexible payment plans make new boilers affordable.
• Up to 12-year guarantee: Some new boilers come with up to a 12-year guarantee, offering peace of mind.
• Fixed price guarantee: No hidden costs or surprises with a fixed price quote.

Should You Reset Your Ariston Boiler?

Resetting your boiler should only be done after addressing the underlying issue. A reset alone won’t fix the problem and can sometimes lead to further damage if the cause isn’t resolved. Follow the boiler manual instructions for resetting, which typically involves holding the reset button for up to 10 seconds.

Final Thoughts

Ariston boilers, like any heating system, can experience a range of issues over time. From low water pressure to ignition failure, these problems can usually be resolved by following the appropriate steps or calling a qualified Gas Safe engineer. Regular maintenance and timely repairs will help ensure that your boiler operates safely and efficiently for years to come.

If your Ariston boiler continues to encounter problems despite repairs, consider replacing it with a more reliable and efficient model. A new boiler can save you money on repairs and energy bills, providing a more comfortable home environment.