Ferroli Boiler Error & Fault Codes: Troubleshooting Guide
Ferroli boilers are known for their sleek design and affordability, but like any boiler, they can experience faults over time. If your Ferroli boiler has stopped working, you’ll likely see an error code displayed on the control panel. These codes indicate what’s wrong, whether it’s a pressure issue, ignition failure, or a faulty sensor.
Common Ferroli boiler error codes include F37 (low pressure), A01 (ignition failure), and F05 (air pressure switch error). Some issues can be fixed at home by repressurising your system or resetting the boiler, while others require a Gas Safe engineer.
In this guide, we’ll explain what these error codes mean, how to fix the most common issues, and when to call in a professional.
How to Identify a Ferroli Boiler Fault Code
Find the Fault Code
- Ferroli boilers display fault codes on the LCD screen. If no screen is present, you may need to check for flashing lights.
- Make a note of the error code before attempting any fixes.
Try Resetting Your Boiler
- Locate the reset button (typically marked with an ‘R’ or a flame icon).
- Press and hold it for 5-10 seconds.
- If the boiler restarts and works normally, the issue may have been temporary.
Check the User Manual
- The Ferroli boiler manual contains a full list of error codes.
- If you don’t have the manual, refer to our list below.
Common Ferroli Boiler Error Codes & Their Fixes
Some error codes indicate minor issues that you can fix yourself, while others require professional repair. Below are the most frequent Ferroli boiler error codes, what they mean, and how to fix them.
F37 – Low System Pressure
Cause: Not enough water in the system, usually due to a small leak or recent radiator bleeding.
Fix:
- Locate the filling loop (a silver braided hose beneath the boiler).
- Open the valves slowly until the pressure gauge reads 1.0-1.5 bar.
- Close the valves and reset the boiler.
A01 – Ignition Failure
Cause: No gas supply, faulty ignition electrode, or low power.
Fix:
- Check if other gas appliances (like a hob) are working.
- Reset the boiler.
- If the problem persists, it may require a Gas Safe engineer to inspect the gas valve.
F05 – Air Pressure Switch Error
Cause: Flue blockage or fan issue.
Fix:
- Check if the flue pipe is blocked by debris or snow.
- If the flue is clear, the air pressure switch or fan may need professional repair.
A06 – No Flame After Ignition
Cause: Low gas pressure, blocked condensate pipe, or faulty sensor.
Fix:
- Check for frozen condensate pipesin winter (if frozen, thaw with warm water).
- If the issue persists, an engineer will need to test the gas pressure and burner.
Pro Tip: If your error code isn’t listed here, scroll down for our complete Ferroli error code table.
Ferroli Boiler Error Codes by Model
Different Ferroli boiler models have unique error codes. Below is a breakdown for the most common models:
Ferroli BlueHelix Tech
- F37 – Low pressure
- A01 – Ignition failure
- A06 – No flame detected
- F34 – Low voltage supply
Ferroli Modena HE System & Combi
- A02 – Flame detected with burner off
- F07 – High flue gas temperature
- F35 – Irregular mains frequency
Ferroli Optimax HE Plus
- A16 – Gas valve fault
- F43 – Exchanger protection activated
For a full list of error codes, see our Ferroli boiler error code table below.
Complete Ferroli Boiler Error Code List
| Error Code | Fault Description | Possible Fix |
|---|---|---|
| A01 | Ignition problem. It may be a faulty electrode or a lack of gas. | Check gas supply, reset the boiler, and inspect the ignition electrode. |
| A02 | A faulty electrode or a card error. | Reset the boiler; if the problem persists, a new electrode or PCB may be required. |
| A03 | Damaged heating sensor causing a lack of water circulation or air within the heating system. | Bleed radiators, check for airlocks, and ensure the circulation pump is working. |
| F04 | Incorrect setting of the card parameter. | Reset the boiler and check for software updates or reprogramming. |
| F05 | Error on the air pressure switch; the flue baffle may be obstructed or incorrectly sized. | Check for flue blockages, clean out any obstructions, and inspect the air pressure switch. |
| A06 | Post ignition phase, there is no flame. Gas pressure issues might cause this. | Check gas pressure, reset the boiler, and inspect the gas valve. |
| F07 | Faulty air pressure switch causing the contacts to close when the fan comes on. | Inspect and replace the air pressure switch if necessary. |
| A09 | Faulty gas valve. It may also be due to a disconnect in the wiring. | Check wiring connections; if faulty, replace the gas valve. |
| F10 | Faulty delivery sensor with wiring causing a short circuit or it’s become disconnected. | Check sensor wiring; replace the sensor if necessary. |
| F11 | Faulty hot water sensor may be damaged or disconnected. | Ensure the sensor is connected properly; replace if faulty. |
| A15 | Presented when fault F05 happens several times within one day – may be due to a faulty air pressure switch. | Inspect the air pressure switch; replace if faulty. |
| A16 | Faulty gas valve. | Check gas valve connections; replace if required. |
| A23 | Problem with the card parameter. It may be due to incorrect settings. | Reset the boiler and check the control board programming. |
| A24 | Problem with the card parameter. It may be due to incorrect settings. | Reset the boiler and check for software updates. |
| F34 | Electricity supply under 170V – problems with the mains electricity. | Check mains voltage and wiring; use a voltage stabiliser if necessary. |
| F35 | Issues with the frequency of the mains electricity. | Check electrical supply and stabilise power fluctuations. |
| F37 | Water pressure too low, or the water pressure switch may be damaged. | Repressurise the system using the filling loop to 1.0-1.5 bar. |
| F39 | External probe error. | Inspect external sensors and replace if damaged. |
| F43 | Intervention by the exchanger protection system. It may be due to a lack of water or air in the system. | Bleed radiators and check the heat exchanger for blockages. |
| F50 | An internal error within the DBM23B controller. | Reset the boiler; if the issue persists, replace the controller. |
| F51 | An internal error within the DBM23B controller. | Reset the boiler; if unresolved, a new controller may be needed. |
| F12 | DHW (Domestic Hot Water) sensor error. | Check and replace the DHW sensor if needed. |
| F13 | Flue probe fault. | Inspect the flue and clean any debris. |
| F14 | Flow sensor error. | Ensure the sensor is properly connected; replace if faulty. |
| F15 | Fan problem. | Check for blockages in the fan and ensure proper operation. |
| A41 | Flow sensor disconnected. | Reconnect the flow sensor and ensure secure wiring. |
| A42 | Flow sensor damaged. | Replace the damaged flow sensor. |
| A50 | Gas valve fault. | Check gas valve connections and replace if faulty. |
Warning: If your Ferroli boiler is leaking gas, making loud noises, or repeatedly shutting down, stop using it immediately and call a Gas Safe engineer.
Preventing Future Boiler Issues
To avoid dealing with frustrating error codes, consider these preventative measures:
- Book an annual boiler service to spot issues early.
- Keep an eye on your pressure gauge (it should always be between 1.0-1.5 bar).
- Bleed your radiators to prevent air buildup.
- Check your flue regularly for blockages, especially in winter.
When to Replace Your Ferroli Boiler
If your Ferroli boiler is over 10 years old, frequently breaks down, or requires costly repairs, replacing it may be the best option. New A-rated boilers are far more energy-efficient, which can save you money on heating bills.
If you’re experiencing regular issues, consider upgrading to a new, reliable boiler with a ;ong-term warranty.
Frequently Asked Questions (FAQs)
Q: What does the F37 error code mean on a Ferroli boiler?
A: It means low system pressure. You can fix it by repressurising the boiler using the filling loop.
Q: How do I reset my Ferroli boiler?
A: Press and hold the reset button for 5-10 seconds until the boiler restarts.
Q: Why does my Ferroli boiler keep losing pressure?
A: Possible causes include small leaks, a faulty pressure relief valve, or air in the system.
Q: How much does it cost to repair a Ferroli boiler?
A: Minor fixes cost around £100-£200, while major repairs can exceed £500.
Q: When should I replace my Ferroli boiler?
A: If it’s frequently breaking down, over 10 years old, or no longer cost-effective to repair.
Conclusion
Ferroli boilers may experience common issues like low pressure, ignition failure, and sensor faults, but some problems can be resolved at home by repressurising the system or resetting the boiler. However, if your boiler continues to fail, professional repair is essential.
At WarmZilla, our Gas Safe engineers can diagnose and repair any Ferroli boiler issue, ensuring your home stays warm and safe.
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