Ferroli claims that it is the relentless consumer demand and the need to address climate change that keeps “Ferroli at the leading edge of appliance design”. Well, design may be a strong point for Ferroli boilers, but are they as reliable as they are aesthetically pleasing? If you’re reading this blog, you’re probably dubious about this claim.
Ferroli was established in 1955, by Dante Ferroli. The original head office is located in San Bonifacio, near the Italian city of Verona. Ferroli now operates in over 14 countries across Europe and Asia, becoming a known boiler manufacturer in the industry.
For over 60 years, Ferroli’s objective has been to drive innovations in the heating industry and produce highly efficient appliances, superbly built and suited to a wide range of specifications.
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Ferroli admits taking great pride in their ability to offer amazing service at all times, stating that all products are “produced entirely in-house”, which allows for “complete control over the quality, delivery and all-important aftersales”. Their products and service being so good that in 2017, the Ferroli BlueHelix Tech 25C was voted Best Boiler and Best Purchase in the Italian magazine, AltroConsumo.
If we take a look at their Trustpilot reviews, off the bat, they seem pretty good. With 3.9 out of 5 stars and over 70% of reviews being positive. However, when we delve a little deeper, the negative reviews consistently talk about poor efficiency and unreliability, going completely against Ferroi’s claims to be highly efficient and reliable.
In 2021, Which? conducted an annual boiler survey, gathering results from 12,000 boiler owners and 166 heating engineers. The results took into consideration the daily user experience and expert opinion. Which? categorised the scores into;
- Reliability Score
- Customer Score
- Engineer Recommendation
- Build Quality
- Availability of Parts
- Ease of Fixing Faults
- Ease of Servicing
Ferroli was scored the lowest of all brands in the survey with an overall score of 35%, compared to other boiler brands such as Vokera, who scored at least 50%. When breaking the scores down, Ferroli received;
- 3/5 Overall Reliability
- 1/5 Engineer Recommendation Score
- 2/5 Consumer Score
Overall, a pretty bad rating.
But I’m guessing you’re reading this blog, nodding your head, thinking, yes I already know.
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The aim of this blog is to help to identify the issues your boiler may be having, with a list of all error/fault codes with Ferroli boilers.
Check out the table below to find your error code and see what the fault code on your Ferroli boiler relates to.
Ferroli Boiler Error Codes
| Fault Code | System Behaviour |
| A01 | Ignition error – possible electrode fault or power too low, no gas or excessive condensate level |
| A02 | Electrode or card error |
| A03 | Heating sensor damaged, no water circulation or air in the system |
| F04 | Wrong card parameter setting |
| F05 | Air pressure switch contact error – wrong flue baffle obstructed or not correctly sized |
| A06 | No flame after the ignition phase – low pressure in gas system burner minimum pressure setting |
| F07 | Air pressure switch error – contacts closed on activation of fan |
| A09 | Gas valve error – wiring could be disconnected or error with gas valve |
| F10 | Delivery sensor error, sensor damaged wiring shorted or disconnected |
| F11 | Domestic hot water (DHW) sensor error – sensor damaged, wiring shorted or disconnected |
| A15 | Fault F05 generated 5 times within the last 24 hours – possible error with the air pressure switch |
| A16 | Gas valve error – wiring disconnected or faulty gas valve |
| A23 | Card parameter error – possibly wrong card parameter setting |
| A24 | Card parameter error – possibly wrong card parameter setting |
| F34 | Supply voltage under 170V – electric mains error |
| F35 | Faulty mains frequency – electric mains error |
| F37 | Error with system water pressure, possible pressure too low or water pressure switch is damaged |
| F43 | Exchanger protection intervention – could be because no system water circulation or there’s air in the system |
| F50 | Controller DBM23B error – controller could have an internal error |
| F51 | Controller DBM23B error – controller could have an internal error |
Ferroli Bluehelix Tech Error Codes
| Fault Code | System Behaviour | Possible cause |
| A01 | No burner ignition | No gas or ignition – issue with detection electrode, faulty gas valve or insufficient gas supply pressure |
| A02 | Flame signal present with burner off | Electrode error or PCB error |
| A05 | Fan error | No 230V power supply or tachometric signal interrupted fan damaged or out of balance |
| A06 | No flame after the ignition phase | Ionisation electrode fault – flame unstable or air/flue ducts obstructed or condensate trap or pipes blocked |
| F07 – F14 – A07 | High flue gas temperature | The flue gas probe detects excessive temperature |
| F08 – A08 | Overtemperature protection intervention | Heating sensor damaged – no water circulation in the system or air in the system |
| F09 – A09 | Overtemperature protection intervention | Return sensor damaged – no water circulation in the system or air in the system |
| F10 – A10 | Flow sensor error | Sensor damaged – wiring shorted or wiring disconnected |
| F11 – A11 | Return sensor fault | Sensor damaged – wiring shorted or wiring disconnected |
| F12 | DHW sensor error | Sensor damaged – wiring shorted or wiring disconnected |
| F13 – A13 | Flue probe fault | Probe damaged – wiring shorted or wiring disconnected |
| A14 | Flue extraction duct safety device intervention | Fault F07 generated 3 times in the last 24 hours |
| F34 | Supply voltage under 170V | Electric mains trouble |
| F37 | Incorrect system water pressure | Pressure too low – water pressure switch either damaged, blocked or not connected |
| F39 | Optional external probe error | Probe damaged or wiring shorted – probe disconnected after activating the outside temperature mode |
| F41 | Activation of maximum ELTA T protection | Heating sensor damaged, return sensor damaged, no water circulation as air in the system |
| F42 – A42 | Sensor control protection activation | Heating sensor damaged, return sensor damaged or disconnected |
| F43 | Exchanger protection intervention | No system water circulation – air in system |
| A23 – A24 – A26 – F15 – F21 – F40 – F47 – F50 – F51 – F53 | Printed circuit board (PCB) parameter fault | Wrong PCB parameter setting |
| F56 – A56 | Calibration error/calibration procedure not completed | Incorrect parameters electrode damaged or not correctly positioned |
| F61 – A61 | Printed circuit board (PCB) AGC01 error | PCB AGC01 internal error |
| A54 – A55 – A63 | Printed circuit board (PCB) AGC01 fault | PCB AGC01 fault |
| F67 | – | Boiler chip card (BCC) service key connected |
| F68 – A68 | Boiler chip card (BCC) service key fault | Error loading BCC service key file |
| A62 | No communication between PCB and gas valve | PCB not connected – valve damaged, replace the valve |
| A64 | Maximum number of consecutive resets exceeded | Maximum number of consecutive resets exceeded |
| F66 | – | Firmware not loaded successfully |
Ferroli Modena HE System Error Codes
| Fault Code | System Behaviour |
| A01 | No burner ignition – possible electrode error, defective gas valve or incorrect inlet gas pressure |
| A02 | Flame detected with the burner off – electrode defective main board defective |
| A03 | High limit protection – possible flow temperature sensor not active or incorrectly located, no system circulation |
| A04 | Flue gas fault – fault F07 happened 3 times in the last 24 hours |
| A05 | Fan error – tachometer signal interrupted for 1 hour or longer |
| A06 | No flame after the ignition phase – electrode error, flame unstable, incorrect valve gas offset or flue gas circuit obstructed |
| A41 | Flow sensor error – sensor disconnected |
| A42 | Flow sensor error – sensor damaged |
| F07 | High fume temperature – the exchanger probe detects an excessive temperature |
| F10 | Flow sensor error – sensor damaged, short-circuited, sensor damaged or wiring broken |
| F11 | Return sensor error – t-sensor damaged, short-circuited, sensor damaged or wiring broken |
| F13 | Exchanger probe error – t-sensor damaged, short-circuited, sensor damaged or wiring broke |
| F14 | Flow sensor error – t-sensor damaged, short-circuited, sensor damaged or wiring broken |
| F15 | Fan problem – tachometer signal interrupted fan connection or damaged debris in fan. You need to check and clean fan debris |
| F34 | Supply voltage under 170v – electric supply error |
| F35 | Irregular mains frequency – electric supply problem |
| F37 | Incorrect system water pressure error – possible sensor damaged or pressure too low |
| F43 | Exchanger protection activation – no system circulation air in the system |
| F52 | Flow sensor – fault sensor damaged |
| A61 | Controller ABM03B error – controller has an internal error |
| A62 | No communication between controller and gas valve – controller not connected or valve damaged |
| A63 – A64 – F66 | Controller ABM03B error – controller internal error |
Ferroli Modena HE Combi Error Codes
| Fault Code | System Behaviour |
| A01 | No burner ignition – possibly no gas, detection or ignition electrode fault, defective gas valve, incorrect inlet gas pressure |
| A02 | Flame detected with the burner off – possibly caused by ionisation, defective electrode or mainboard defective. Check the printed circuit board (PCB) or ionizing electrode wiring |
| A03 | High limit protection – flow temperature sensor not active, incorrectly located or no system circulation. Check the position of the flow sensor or check pump and radiator valves |
| A04 | Flue gas fault – could be because F07 happened 3 times in the last 24 hours – check the flue |
| A05 | Fan problem – tachometer signal interrupted for 1 hour or longer – check the wiring and the fan |
| A06 | No flame after ignition phase – possible causes: detection electrode fault, flame unstable, incorrect valve gas offset, flue gas circuit |
| A41 | Flow sensor disconnected – check the correct positioning and operation of the flow sensors |
| A42 | Flow sensor fault – sensor needs changing |
| F07 | High fume temperature – the exchanger probe detects an excessive temperature for over 2 minutes – check the exchanger. |
| F10 | Flow sensor fault – possible causes: sensor damaged, short-circuited or wiring broken check the wiring |
| F11 | Return sensor fault – sensor wiring shorted or broken – check the wiring |
| F12 | Domestic hot water (DHW) sensor fault – sensor damaged, wiring shorted or wiring disconnected – check the wiring |
| F13 | Exchange probe fault – wiring shorted or wiring broken – check wiring |
| F14 | Fan problem – tachometer signal interrupted fan connection. Fan damaged or debris in fan – check the wiring, the fan and clean debris |
| F15 | Supply voltage under 170v – electric supply problem – the electrical system needs checking |
| F34 | Irregular mains frequency – possible electric supply problem – the electrical system needs checking |
| F35 | Incorrect system water pressure – the possible cause is pressure too low or sensor damaged – the system may need filling or check the sensor |
| F37 | External probe fault sensor damaged or short-circuited – check the wiring |
| F39 | Exchanger protection activation – possibly caused by no system circulation, the air in the system or sensor damaged |
| F43 | Flow sensor fault – sensor damaged – sensor needs changing |
| F52 | Controller 041049G0 fault – controller internal error |
| A61 | No communication between controller and gas valve controller – could not be connected or valve damaged |
| A62 | Controller 041049G – internal error |
| A63 – A64 – F66 | Controller DBM12 fault |
Ferroli Discontinued Boiler Error Codes
DOMIcondens HE 26 C
OPTIMAX HE PLUS 31C boiler
OPTIMAX HE PLUS 38C boiler
| Boilers | Fault Code | System Behaviour |
| DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C | A01 | No burner ignition |
| OPTIMAX HE PLUS 38C | A01 | The burner fails to light |
| DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | A02 | Flame present signal with burner off, possible electrical fault |
| DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | A03 | Over-temperature protection activation |
| DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C | A04 | Fume thermostat fault |
| OPTIMAX HE PLUS 38C | A04 | Fume extraction duct safety device activation |
| DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C | A05 | Fan fault or fume pressure switch fault |
| OPTIMAX HE PLUS 38C | A05 | Fan protection activated |
| DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | A06 | No flame after the ignition phase |
| OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | F07 | High fume temperature |
| DOMIcondens HE 26 C | F07 | Card parameter |
| DOMIcondens HE 26 C | A09 | Gas value fault |
| DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | F10 | Delivery sensor 1 fault |
| DOMIcondens HE 26 C | F11 | DHW sensor fault |
| OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | F11 | Return sensor fault |
| OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | F13 | Fume sensor fault |
| DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | F14 | Delivery sensor 2 fault |
| OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | F15 | Fan fault |
| DOMIcondens HE 26 C | A16 | Gas valve fault |
| DOMIcondens HE 26 C | F20 | Combustion control fault |
| DOMIcondens HE 26 C | A21 | Poor combustion fail |
| DOMIcondens HE 26 C | A23 | Set nominal system water pressure not reached within 4 minutes |
| DOMIcondens HE 26 C | A24 | 4 fillings within 24 hours |
| DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | A34 | Supply voltage under 170V / 180V |
| DOMIcondens HE 26 C | A35 | Faulty mains frequency |
| OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | A35 | Mains frequency anomaly |
| DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | A37 | Incorrect system water pressure |
| DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | A39 | External probe fault |
| DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | A41 | Sensor positioning |
| DOMIcondens HE 26 C / OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | F42 | Heating sensor fault |
| DOMIcondens HE 26 C | A43 | Exchange protection activation |
| DOMIcondens HE 26 C | A50 | Gas valve fault |
| DOMIcondens HE 26 C | A51 | Poor combustion fault |
| OPTIMAX HE PLUS 31C boiler / OPTIMAX HE PLUS 38C | A62 | No communication between electronic controller and gas valve |
Below is a complete list of Ferroli boiler manuals courtesy of our friends over at freeboilermanuals.com. If the answer to your boiler issue can’t be found in the fault code tables, maybe you will find it in the Ferroli boiler manual.
- Arena 30 A
- Arena 30 C
- Ferroli Atlas A
- Ferroli Atlas D
- Ferroli Bluehelix TECH RRT 24C
- Ferroli Bluehelix TECH RRT 28C
- Ferroli Bluehelix TECH RRT 34C
- Ferroli Bluehelix PRO RRT 18S
- Ferroli Bluehelix PRO RRT 24S
- Ferroli Bluehelix PRO RRT 30S
- Ferroli DOMIcompact F 24 B
- Ferroli DOMIcompact F 24 D
- Ferroli DOMIcompact F 30 B
- Ferroli DOMIcompact F 30 D
- Ferroli DOMIcondens F
- Ferroli DOMIcondens HE26c
- Ferroli Domina 80 E
- Ferroli Domina 102 DGT
- Ferroli Domina N 80 DGT
- Ferroli Econcept 50A
- Ferroli Econcept 51A
- Ferroli Energy top B
- Ferroli Extrema C
- Ferroli F24
- Ferroli F24B
- Ferroli F30
- Ferroli F30B
- Ferroli F30E
- Ferroli Falcon 11
- Ferroli Falcon 80
- Ferroli FERcondens 25 HE
- Ferroli FERcondens 25 HE LPG
- Ferroli Fertech 18 OV
- Ferroli Fertech 25 OV
- Ferroli Fersystem Tech 31 C
- Ferroli Fersystem Tech 38 C
- Ferroli Hawk 11
- Ferroli i25 Erp
- Ferroli i29 Erp
- Ferroli LEB TS
- Ferroli Maxima 35 C
- Ferroli Maxima 35 S
- Ferroli Modena 27 C HE
- Ferroli Modena 32 C HE
- Ferroli Modena 80 E
- Ferroli Modena 102
- Ferroli Modena 38c HE
- Ferroli Modena 18S HE
- Ferroli Modena 25S HE
- Ferroli Modena 32S HE
- Ferroli New Condense FS 300 Series
- Ferroli New Condense FS 600 Series
- Ferroli Optima 201
- Ferroli Optima 601
- Ferroli Optima 701
- Ferroli Optima 800
- Ferroli Optima 801
- Ferroli Optima 900
- Ferroli Optima 901
- Ferroli Optima 1001
- Ferroli Optima 2001
- Ferroli Optimax 25 C
- Ferroli Optimax 25 S
- Ferroli Optimax 25 OV
- Ferroli Optimax HE Plus 25 OV
- Ferroli Optimax HE Plus 25 S
- Ferroli Optimax HE Plus 31 C
- Ferroli Optimax HE Plus 31 S
- Ferroli Optimax HE Plus 38 C
- Ferroli Optimax HE Plus 18OV
- Ferroli Optimax HE Plus 18 S
- Ferroli Optimax HE Plus 25 OV
- Ferroli Optimax HE Plus 25 S
- Ferroli Optimax HE Plus 31 C
- Ferroli Optimax HE Plus 35 S
- Ferroli Optimax HE Plus 38 C
- Ferroli Option
- Ferroli Pegasus 56
- Ferroli Pegasus 67 -107S
- Ferroli Prextherm RSH
- Ferroli Quadrifoglio B
- Ferroli Roma 55 FF
- Ferroli Sigma 20-40
- Ferroli Sigma 40-60
- Ferroli Sigma 60-100
- Ferroli Sigma 30 FF
- Ferroli Sigma 40 FF
- Ferroli Sigma 50 FF
- Ferroli Sigma 60 FF
- Ferroli System 10-23
- Ferroli Tempra
- Ferroli Tempra 12
- Ferroli Tempra 18
- Ferroli Tempra 30
- Ferroli T One 18 S HE
- Ferroli T One 25 S HE
- Ferroli T One 32 S HE
- Ferroli T One 25 C HE
- Ferroli T One 30 C HE
