Ferroli Boiler Repairs
Experienced Ferroli Boiler Repairs specialists
Available 24 hours a day, 7 days a week
Insurance approved
All parts guaranteed for a year
Fully Gas Safe trained engineers
Ferroli Boiler Repairs London
Gas Safe registered engineers • 24/7 call handling • London wide
Call Now: 0203 868 6251
Tell us the fault code and model. We will advise the safest next step.
Common Ferroli models we repair include Modena, Optimax, Domicompact, and Domicondens, with frequent calls for codes A01, A06, F37, and F05.
We fix Ferroli boiler fault codes, no heating, no hot water, lockout, leaking, and low pressure across London.
We also offer boiler servicing and boiler installation across London.
Quick Navigation
Safety First
Smell gas? Turn off the gas supply at the meter if it is safe to do so. Open windows. Leave the property. Call the National Gas Emergency Service on 0800 111 999. Do not use switches, and do not use naked flames.
CO alarm sounding? Open windows immediately. Leave the property. Call 999. Do not re-enter until cleared by emergency services.
Boiler leaking heavily? Turn off the boiler at the controls. If safe, turn off the water supply. Call an engineer.
Quick Checks Before You Call
Before calling an engineer, these safe checks may resolve simple issues with your Ferroli boiler.
Check the gas supply
Is gas working at other appliances in your home? If not, check your meter and any prepayment credit.
Check the pressure gauge
Pressure should read around 1.0 to 1.5 bar when cold. If below 1 bar, you may need to repressurise using the filling loop.
Check the thermostat
Is the room thermostat set above current room temperature? Are the batteries working?
Check the timer or programmer
Is the heating scheduled to be on? Check the clock is set correctly.
Try a single reset
Locate the reset button on your Ferroli boiler. Press once and wait. If the fault returns, do not keep resetting. Call an engineer.
Check the condensate pipe
In cold weather, the external condensate pipe can freeze. Look for a white plastic pipe exiting through an outside wall. If frozen, pour warm water over it gently.
Ferroli Fault Codes
Note: Ferroli fault codes can vary by model and generation. If your code is not listed here, call us with the exact code and model and we will advise the safest next step.
Common Ferroli fault codes and what to do
| Code |
What It Means |
What To Do |
| A01 |
Ignition failure (no burner ignition) |
Check gas supply and whether other gas appliances work. In freezing weather, check condensate pipe. If still locked out, call an engineer. |
| A06 |
No flame after ignition phase |
Reset once. Check if other gas appliances work and check condensate pipe in winter. If it returns, call an engineer. |
| F37 |
Low system water pressure |
Top up to 1.0 to 1.5 bar. If it drops again within days, call an engineer. |
| F05 |
Fan or flue / air pressure switch issue |
Do not attempt DIY on flues. If it returns after a reset, call an engineer for safe checks. |
| A03 |
Overheat or circulation related protection (model dependent) |
Do not keep resetting. If radiators are cold or noisy, call an engineer to check circulation and safety controls. |
| F34 |
Low mains voltage (model dependent) |
Reset once. If it continues, call an engineer to assess electrical supply stability and boiler controls. |
Most Searched Ferroli Problems
If you are seeing a lockout, loss of hot water, or your Ferroli boiler keeps resetting, tell us the fault code and model and we will confirm the safest next step.
A01 – ignition failure
A01 is the most common Ferroli fault code. The boiler tries to ignite but fails. Common causes include gas supply issues, a faulty ignition electrode, or a blocked condensate pipe in winter. Check gas is on elsewhere in the home. Try one reset. If the lockout returns, stop and call an engineer.
F37 – low pressure
If your Ferroli shows F37, system pressure has dropped below the minimum threshold. Top up via the filling loop to around 1.0 to 1.5 bar when cold. If pressure drops again within days, there may be a leak in the system or a failing expansion vessel. Call an engineer to find the cause.
No hot water but heating works
On Ferroli combi boilers, you may get heating but no hot water, or the reverse. This often points to a diverter valve issue. The diverter valve directs hot water between taps and radiators. When it wears or sticks, hot water delivery becomes unreliable. Call an engineer for diagnosis.
A03 – overheat lockout
If your Ferroli shows A03, the boiler has overheated and locked out for safety. This can indicate a circulation problem, pump failure, or blocked heat exchanger. Do not keep resetting. Call an engineer to check the system.
Why Ferroli Boilers Develop Faults
Ferroli boilers are popular in the UK. Here is what we commonly see.
Ignition electrode wear
Ignition faults (A01, A06) can occur when the ignition electrode wears or becomes coated with carbon. Condensate blockages in winter can also contribute to repeated lockouts.
Pressure relief valve and expansion vessel
Low pressure faults (F37) often point to a failing expansion vessel or a weeping pressure relief valve. The expansion vessel absorbs pressure changes as water heats and cools. If the diaphragm fails or the air charge is lost, pressure drops can occur.
Fan and air pressure switch
Fan faults (F05) prevent safe combustion and flue gas extraction. The boiler will lock out for safety. Causes include fan motor failure, blocked flue, or air pressure switch faults.
Diverter valve on combi boilers
The diverter valve directs hot water between your taps and radiators. When it wears or sticks, you may get heating but no hot water, or the reverse.
PCB and electrical faults
The printed circuit board controls all boiler functions. On older Ferroli models, PCB faults can occur. Low mains voltage (F34) can also cause erratic behaviour.
Ferroli Models We Repair
We repair Ferroli combi, system, and regular boilers in London, including:
Modena range: Modena 80E, Modena 102E, Modena 25C, Modena 30C
Optimax range: Optimax HE 25C, Optimax HE 31C, Optimax HE 38C
Domicompact range: Domicompact F24B, Domicompact F30B
Domicondens range: Domicondens F24, Domicondens F28
Other models: Domina, Divatop, Arena, Bluehelix, Torino
Ferroli parts are generally available. We check availability before attending and advise honestly if repair is not viable or cost effective.
Repair or Replace Your Ferroli Boiler?
We help you decide based on age, reliability, and parts availability.
Repair makes sense when
- Boiler is under 10 years old
- This is the first major fault
- Parts are readily available
- Boiler has been regularly serviced
Replacement may be better when
- Boiler is 12 to 15 years old or more
- You have had multiple breakdowns recently
- Parts are obsolete or hard to source
- The boiler is undersized for the property
- Energy bills are higher than expected for the property size
Our engineers give honest assessments. We focus on safety and reliability, not pushing unnecessary replacements.
Ferroli Boiler Servicing
Annual servicing reduces breakdown risk and keeps your Ferroli boiler running efficiently. See Boiler servicing London.
Landlords and Letting Agents
We provide boiler repairs and gas safety certification for landlords across London. See Landlord gas safety certificate (CP12).
Ferroli Repairs Across London
London wide coverage for Ferroli boiler repairs. Book an engineer or view our London areas we cover.
Have your postcode and fault code ready and we will confirm the quickest appointment slot.
Other Boiler Brands We Repair
Worcester • Vaillant • Ideal • Baxi • Glow worm • Viessmann • Potterton • Vokera • Alpha • Atag
View all brands
Ferroli Boiler Repair FAQs
How quickly can you attend for a Ferroli breakdown?
We offer same day attendance where slots are available. For no heating or hot water, we prioritise urgent breakdowns. Call our 24/7 line and we will advise availability.
Do you carry Ferroli parts?
We stock common Ferroli parts including diverter valves, ignition electrodes, pressure sensors, and PCBs. For less common parts, we can usually source within 24 to 48 hours.
Is it safe to reset my Ferroli boiler?
Try one reset. If the fault returns after resetting, stop and call an engineer. Do not keep resetting.
How much does a Ferroli boiler repair cost?
Costs vary depending on the fault and parts required. We diagnose first and quote before any repair work begins.
Related Services
Speak to Our Team
For safe next steps, call now.
Call 0203 868 6251 | Book an Engineer
Gas Safe registered • 24/7 call handling • Quote before work
