Common Ferroli boiler error codes

Ferroli boilers are known for their affordability, compact design, and energy efficiency. However, like any boiler, they may occasionally display faults. If your heating or hot water stops working, your Ferroli boiler will usually show an error code on its screen. These codes help identify what’s gone wrong—whether it’s low pressure, ignition failure, or a faulty sensor. 

In this guide, we’ll walk you through the most common Ferroli boiler error codes, how to identify them, and what steps you can take to fix the issue. We’ve also included a complete error code list by model and provided tips on how to avoid future problems. 

At Maintracts Services Ltd, we specialise in diagnosing and repairing all types of boiler faults, including Ferroli boiler error codes. Our Gas Safe registered engineers offer fast, professional support to get your heating and hot water working again with minimal disruption. Call us on 020 8131 9985 for expert boiler repair or routine servicing in London. 

 

 

How To Identify A Ferroli Boiler Fault Code

Most modern Ferroli boilers display an error code on their LCD screen. If your model doesn’t have a digital display, flashing lights may indicate a fault instead. Here’s how to check and react:

1. Find The Fault Code

Examine your boiler’s control panel and record the code displayed on it. This will help identify the issue faster.

2. Try Resetting Your Boiler

Locate the reset button, usually marked with an 'R' or a flame icon. Hold it for around 5–10 seconds. If the boiler restarts successfully, the fault may have been a one-off issue.

3. Check The User Manual

If you have your Ferroli boiler manual to hand, it will include a list of fault codes. Alternatively, refer to our complete Ferroli boiler error code list below.

 

Common Ferroli Boiler Error Codes And Their Fixes

Some boiler faults are minor and can be sorted quickly at home. Others may be signs of more serious problems and should be dealt with by a professional. Here are the most frequently encountered Ferroli boiler error codes, along with their meanings.

1. F37 – Low System Pressure

This is caused by insufficient water in the system, possibly due to a leak or after bleeding the radiators. Here’s how to fix it:

• Locate the filling loop under your boiler (usually a silver braided hose).
• Slowly open the valves until the pressure gauge reaches 1.0–1.5 bar.
• Close the valves and reset the boiler.

2. A01 – Ignition Failure

It's a faulty ignition electrode, which indicates no gas or low voltage. The following are ways you can fix it:

• Check if other gas appliances are working.
• Reset the boiler.
• If the fault returns, a Gas Safe engineer should check the gas valve or ignition unit.

3. F05 – Air Pressure Switch Error

A flue obstruction or a broken fan causes it. Here’s how to fix it:

• Inspect the flue pipe for any blockages (e.g. debris, snow, or bird nests).
• If the flue is clear, the pressure switch or fan may require professional attention.

4. A06 – No Flame After Ignition

This results from low gas pressure, frozen condensate pipe, or a faulty flame sensor. You need to fix it in the following ways:

• In winter, check for a frozen condensate pipe and thaw it with warm water.
• If unresolved, contact a qualified engineer to inspect the gas supply and sensors.

 

Ferroli Boiler Error Codes By Model

Different models come with unique sets of fault codes. Here's a quick overview of some popular models and their most common error messages.

1. Ferroli BlueHelix Tech

• F37 – Low pressure
• A01 – Ignition failure
• A06 – No flame
• F34 – Low voltage supply

2. Ferroli Modena HE System & Combi

• A02 – Flame detected with burner off
• F07 – High flue gas temperature
• F35 – Irregular mains frequency

3. Ferroli Optimax HE Plus

• A16 – Gas valve fault
• F43 – Exchanger protection activated

 

Complete Ferroli Boiler Error Code List

Here’s a detailed list of Ferroli boiler error codes and possible fixes:

Error Code	Fault Description	Suggested Fix
A01	Ignition problem	Check the gas supply and electrode
A02	Flame is detected when the burner is off	Reset or replace the PCB
A03	Damaged heating sensor	Bleed radiators, check the pump
F04	Parameter error	Reset the boiler, check settings
F05	Air pressure switch error	Clear the flue or replace the air pressure switch
A06	No flame after ignition	Check the gas supply and inspect the gas valve
F07	Faulty air pressure switch	Replace the air pressure switch
A09	A faulty gas valve or wiring	Replace the gas valve or reconnect the wiring
F10	Faulty delivery sensor	Check wiring, replace sensor if needed
F11	Hot water sensor issue	Reconnect or replace the hot water sensor
A15	Frequent F05 errors	Replace the air pressure switch
A16	Gas valve issue	Replace the gas valve
A23 / A24	Parameter or card programming issue	Reset the boiler or update the control PCB
F34	Low mains voltage (<170V)	Use a voltage stabiliser
F35	Main frequency fault	Stabilise the electrical supply
F39	External probe error	Inspect and replace the external probe if damaged
F43	Heat exchanger protection triggered	Bleed system, inspect the heat exchanger
F50 / F51	Internal DBM23B controller error	Reset the boiler, and replace the controller if necessary
F12	Domestic hot water (DHW) sensor fault	Replace the DHW sensor
F13	Flue probe fault	Clean or replace the flue probe
F14 / F15	Flow sensor or fan issues	Replace the sensor or check the fan for blockages
A41 / A42	The flow sensor is disconnected or damaged	Reconnect wiring or replace the flow sensor
A50	Gas valve fault	Inspect connections and replace the gas valve if it is faulty

 

Note: If your boiler is leaking gas, making strange noises, or constantly shutting off, switch it off and contact our Gas-Safe registered engineer immediately for emergency support. We are available 24/7 to offer support as needed.

 

Preventing Future Boiler Issues

While occasional faults are inevitable, most boiler issues can be avoided with regular upkeep. Here are some tips to keep your Ferroli boiler in top condition:

• Book an annual boiler service in London or your local area.
• Monitor the pressure gauge weekly—it should remain between 1.0 and 1.5 bar.
• Bleed your radiators to remove trapped air.
• Check your flue for blockages, especially after storms or snowfall.
• Keep your boiler’s manual handy and store it near the unit.

 

When To Replace Your Ferroli Boiler

Even a well-maintained boiler won’t last forever. If your unit is over 10 years old, frequently breaking down, or costing more to repair than it's worth, it may be time for a replacement. New boilers are quieter, more efficient, and come with extended warranties. 

If you're facing recurring faults despite regular servicing, consider upgrading to a newer model. While researching options, you may also want to compare how other brands perform. Our local heating engineers are qualified to offer fixes for Glow-worm boiler error codes, Ideal Logic boiler fault codes, Baxi boiler error codes, Ariston boiler error codes, and Biasi boiler fault codes. We will also provide you with an understanding of how other manufacturers address faults. 

 

Conclusion

Understanding Ferroli boiler error codes can save you time, stress, and money by helping you identify the root of a fault early on. While minor issues can be easily resolved at home, others may require the skills of a qualified engineer. Ignoring warning signs can lead to bigger problems down the line, so it’s always best to take action promptly.  

Regular maintenance and annual servicing are crucial for keeping your boiler running smoothly and preventing recurring error codes. If your Ferroli boiler is ageing or frequently breaking down, consider an upgrade. 

For fast repairs, professional support and honest advice, trust Maintracts Services Ltd. We offer reliable boiler service in London, whether it’s a quick fix or a long-term solution. Contact us today on 020 8131 9985 to restore warmth and peace of mind!