A codes: lockout
The boiler is locked and stays off. The cause (flame, overheating) needs a diagnosis by an engineer.
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Ferroli Error Codes
Your Ferroli Bluehelix, Divacondens or Domiproject boiler shows A01, F37 or another code? The table explains the common Ferroli codes. With Ferroli, a code starting with A is a lockout that keeps the boiler stopped, while an F code is a fault that may clear once its cause disappears. We repair Ferroli boilers 7 days a week with the price given first.
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FerroliBluehelix, Divacondens
A and F codesLockout or fault
7 days a weekEvenings too
Price upfrontAgreed before work
Ferroli boilers in Belgian homes
The Italian manufacturer Ferroli sells compact condensing combi boilers that are often chosen for flats and small houses. The Bluehelix and Divacondens ranges are the most common today; many older Domiproject and Domina boilers are still running.
The code we are called for most is A01: the burner did not light and the boiler locked out. Next comes F37, a water pressure that is too low, followed by sensor faults (F10, F11) and overheating (A03).
Codes F34 and F35 are worth knowing: they do not point to the boiler itself but to its power supply, which can be disturbed by a weak line or another appliance.
Diagnosis and service of a Ferroli
Our engineer reads the code, measures gas pressure, ionisation and temperatures, tests the pump and the pressure sensor, and only then decides which part is responsible. You are told the price of the repair before he starts.
The yearly service keeps A01 and A06 lockouts away by cleaning the burner, inspecting the electrode and the condensate siphon and analysing the combustion. You receive the service attestation afterwards.
Common Ferroli error codes
The Ferroli codes we see most. Search for yours in the box; any other code, give it to us by phone.
| Code | Meaning | What the technician checks |
|---|---|---|
| A01 | Burner does not light: no flame detected (lockout) | Gas supply, ignition and detection electrode, gas valve. |
| A02 | Flame signal while the burner is off | Electrode, wiring, circuit board. |
| A03 | Overheating protection triggered | Circulation, pump, air in the circuit, flow sensor. |
| A06 | No flame after the ignition phase | Gas pressure, minimum gas setting, electrode. |
| F10 | Flow sensor 1 fault | Flow sensor and its wiring. |
| F11 | Hot water sensor fault | Hot water sensor and its wiring. |
| F14 | Flow sensor 2 fault | Second flow sensor and its wiring. |
| F34 | Supply voltage below 180 V | Electrical supply to the boiler. |
| F35 | Abnormal mains frequency | Electrical supply to the boiler. |
| F37 | Incorrect system water pressure (too low) | Circuit pressure, leaks, pressure sensor. |
| F39 | Outdoor sensor fault | Outdoor sensor and its cable. |
| F40 | System water pressure too high | Filling, expansion vessel, pressure sensor. |
Code not in this table: call us, our technician knows it.
Smell of gas? Do not touch any switch, open the windows, leave the house and call 112 from outside. For any other code, write it down and call us: the technician knows what to look at and brings the right parts.
A and F codes: what is the difference?
F codes: fault
A sensor, the pressure or the power supply is out of range. Some clear by themselves when the condition returns to normal; if not, the part is tested.
When the code returns
A code that keeps coming back always hides a real cause. Note it and call us.
Our call-out in three steps
Tell us the code
Model and code on the display. We plan the visit and the parts.
Measurement
The engineer confirms the cause with his instruments before any replacement.
Repair
Price announced first, repair, test, job report and invoice.
What our customers say
Where do we work?
Ferroli boilers are repaired and serviced by our engineers throughout Belgium: Brussels, Wallonia and Flanders. Call us and we will tell you the first time a technician can come.
BrusselsWalloon BrabantFlemish BrabantHainautNamurLiègeLuxembourg provinceAntwerpEast FlandersWest FlandersLimburg
The brands we work with
Our technicians work on all brands: they install, service and repair appliances from the major manufacturers. For a new installation, we recommend the model that suits your home and budget.
We buy our equipment from all the major Belgian wholesalers and suppliers, including Facq, Van Marcke and Desco: genuine parts, quickly available.
Frequently asked questions
What does A01 mean on a Ferroli boiler?
The burner did not light and the boiler has locked out. Gas supply, ignition electrode, flame detection and gas valve are inspected.
What does F37 mean?
The water pressure in the heating system is not correct, usually too low. A pressure that keeps falling points to a leak or a faulty part.
My Ferroli shows A03: is it serious?
The overheating protection has tripped. The water is not circulating well enough: pump, air in the circuit or flow sensor must be examined.
What do F34 and F35 mean?
The supply voltage is too low (F34) or the mains frequency is abnormal (F35). The electrical supply to the boiler is examined.
What should I do when a code appears?
Write it down and call us. Repeated restarts will not repair the boiler.
Do you service Ferroli boilers?
Yes, all Ferroli gas boilers, with cleaning, combustion analysis and the service attestation.
Your Ferroli shows a code?
Call us or pick a time online: a heating engineer comes to find and repair the fault.