Ferroli Boiler Fault Codes

Is your Ferroli boiler on the blink? It’s common that ever so often your boiler might display an error code, it happens and it doesn’t always mean that you’ll need to call a repairman or need to replace the boiler, a lot of the errors can be fixed simply with a reset.

Ferroli boilers are typically very reliable, but they do from time to time display error codes, just like any boiler. In this article, we’ve had an in-depth look at everything in relation to Ferroli errors from how to reset it to each individual error code and what it means.

As you can image, there are a lot of different Ferroli boilers, so this article is rather large. You can navigate to the section that best suits your query by clicking the below links:

Ferroli boiler error code guide

Have you had an issue with your Ferroli boiler? In this section of the article, we’ll be touching on a few common problems and fixes before we dig into the individual codes.

How do you reset a Ferroli boiler?
Most Ferroli boilers have an easy to use reset switch, it should be located on the front of the boiler & you simply hold it down to reset the boiler. Although some Ferroli boilers have it in different locations.

All boilers will have a reset button and in most cases you simply have to push and hold the button for 10 seconds, wait for the boiler to do it’s thing and ignite. Make sure that you don’t keep clicking the button over and over as this can cause further issues with the boiler and lead you to having to call a boiler engineer.

You can tell when the boiler has fully reset because it should have the flame ignited and hopefully your error code would have disappeared.

What pressure should a Ferroli boiler be at?
Your Ferroli boiler, no matter what type it is, should have a pressure between 1.0 and 2.0 bars. If it drops below the 1.0 mark, you will then need to repressurise it. If this continually happens, it often means that you have a leak somewhere in your system, which you can try to locate yourself or call a boiler engineer.

How do I repressurise a Ferroli boiler?
All boilers work the same when it comes to repressurising them, it’s quite simple to do and you should be able to DIY. Here’s a quick step by step guide on what you should do:

  1. Completely switch the boiler off and let it cool down
  2. Check that both ends of the filling loop are securely attached
  3. There should be two valves, open them & allow it to fill with cold water – it should make a noise and you should see the pressure rise
  4. Close both valves & turn the boiler back on
  5. The boiler may need resetting

How long should a Ferroli boiler last?
Ferroli are a reliable manufacturer of boilers & it should last the test of time as long as you regularly service and maintain it. A boiler that is regularly serviced should last you anywhere between 10 and 15 years, so if your boiler is only a few years old and has a fault, it’s often just a reset or repair rather than a replacement job.

Most common Ferroli fault codes

Although there are several different fault codes your Ferroli boiler can display there are a few that regularly crop up time and time again. Before reading through the rather large list of fault codes in the next part of this post, we’ve pulled together some of the most common & how to fix them for you below to save you some time:

  • FH Error Code: FH can be one of two things, the flame detection electrode or a faulty PCB – you’ll need a boiler engineer but the later of the two is an expensive fix!
  • D1 Error Code: This is often an issue with the diverter valve, and will require a boiler engineer but it should be a relatively quick and inexpensive fix.
  • AO1 Error Code: This is an ignition error, it can be caused by quite a few things such as an electrode fault, excessive condensation, little to no gas supply or a power fault. You should check your gas supply and reset the boiler, but if the problem persists you will need to call a boiler engineer.
  • A51 Error Code: The A51 error is a poor combustion fault, and unfortunately this is another one where you will need to call a boiler engineer.
  • T5 Error Code: This is to do with the PCB, but it shouldn’t need replacing. Simply hold down the reset button until T5 appears, press reset a further time and then you should see it say P01 after which press the button for heating temperature and that should fix the issue.

Ferroli boiler fault code list

In this section, we’ll go into depth on all the various fault codes, a description of the issue and what you can do about it. Each Ferroli model series has a different set of fault codes, so we’ve split it out in that way.

So to find your fault much quicker, click on what Ferroli boiler model you have:

Ferroli Bluehelix Tech

The Bluehelix boiler range by Ferroli is focused on quality and longer life span, with it containing fewer components there’s a lot less that can go wrong, the cost of replacing parts on this boiler is generally cheaper as well. That being said, here are the main fault codes of this type of boiler:

Fault CodeDescription of ErrorThe Possible CauseAdvised Solution
A01The burner is not ignitingThere is no gas or an issue with the ignition - if the latter it could be the detection electrode,
with detection electrode, faulty gas valve or poor gas pressure.
Ensure that your gas is working fine & reset the boiler. If the error still occurs, call a boiler engineer.
A02The burner is off but the flame signal is presentPCB or electrode errorBoth of these issues will require you to call a boiler engineer.
A05An issue with the fanThe fan could be damaged, out of balance or no power supplyThis will require you to call a boiler engineer.
A06After the ignition phase there is no flameIonisation electrode faultThis will require you to call a boiler engineer.
A14The flue extraction duct has shut off for a safety issueThis happens if the fault F07 has generated 3x in the last 24h periodThis is a safety feature for repeated fault code issues, call a boiler engineer.
A23 through A26 – F15, F20, F21, F40, F47, F50, F51 & F53PCB parameter faultParameter setting on the printed circuit board is wrongThis will require you to call a boiler engineer.
A54, A55 & A63AGC01 Fault on the PCBPCB faultThis will require you to call a boiler engineer.
A62The PCB board isn't talking to the gas valveThe valve is damaged and might need replacedThis will require you to call a boiler engineer.
A64Maximum number of resets consecutively has been reachedYou've reset the boiler too many times in a rowLeave the boiler for a while, try reset it in a few hours time
F07, F14 & A07The gas flue has reached it's max temperature and is shutting down for safetyExcessive temperature in the flueTurn the boiler off, let it cool down and start it up again. If the problem persists call a boiler engineer.
FO8 & A08Protection against excessive temperatureDamage to the heating sensor elementThis will require you to call a boiler engineer.
FO9 & A09Protection against excessive temperatureDamage to the return sensor elementThis will require you to call a boiler engineer.
F10 & A10Error with the flow sensorThe sensor is damagedThis will require you to call a boiler engineer.
F11 & A11Error with the return sensorThe sensor is damagedThis will require you to call a boiler engineer.
F12Error with the DHW sensorThe sensor is damagedThis will require you to call a boiler engineer.
F13 & A13Error with the flue probeThe probe is damagedThis will require you to call a boiler engineer.
F34Electrical supply issueThe supply to the boiler is under the recommended 170VThis will require you to call a boiler engineer.
F37The water pressure to the boiler is incorrectThe pressure is too low for the boiler to operateThis could be an issue with a damage, blocked or disconnected water pressure switch, call a boiler engineer.
F39Error with the external probeThe probe is damagedThis will require you to call a boiler engineer.
F41ELTA T protection has been activatedThe heating sensor has been damagedThis will require you to call a boiler engineer.
F42 & A42The sensor control protection has activatedThe heating sensor has been damagedThis will require you to call a boiler engineer.
F43Intervention of the exchanger protectionThere's air in the system causing no system water circulationThis will require you to call a boiler engineer.
F56 & A56An error with the callibrationAn electrode is damaged or not correctly positionedThis will require you to call a boiler engineer.
F61 & A61PCB AGC01 ErrorPCB ErrorThis will require you to call a boiler engineer.
F66Not loaded correctlyThe firmware has not loaded correctlyReset the boiler
F67-Boiler chip card service key connectedReset the boiler
F68 & A68Fault with the boiler chip cardError loading the boiler chip cardReset the boiler, but if the error persist call a boiler engineer.

Ferroli Modena HE Combi

This is one of their largest ranges and most commonly used in homes, they generally get good reviews and are a trusted range. There reliable and easy to maintain, they also have no plate to plate heat exchanger/diverter valve, which means less to go wrong. Here are the error codes this model series can display:

Fault CodeDescription of ErrorThe Possible CauseAdvised Solution
A01The burner is not ignitingThere is no gas or an issue with the ignition - if the latter it could be the detection electrode,
with detection electrode, faulty gas valve or poor gas pressure.
Ensure that your gas is working fine & reset the boiler. If the error still occurs, call a boiler engineer.
A02The burner is off but the flame signal is presentPCB or electrode errorBoth of these issues will require you to call a boiler engineer.
A03An issue with the fanThe fan could be damaged, out of balance or no power supplyThis will require you to call a boiler engineer.
A04Fault with the flue gasThis happens if an F07 fault has happened 3x in the last 24h periodThis will require you to call a boiler engineer.
A05Error with the fanThe signal from the tachometer has been interrupted for over an hourReset the boiler, if the error persists call a boiler engineer.
A06After the ignition phase there's no flameThis could be due to to a detection electrode, unstable flame, incorrect valve offset or flue gas, so a lot of things!This will require you to call a boiler engineer.
A41Disconnected flow sensorThe positioning of the flow sensors are wrongThis will require you to call a boiler engineer.
A42Fault with the flow sensorThe flow sensor has to be changedThis will require you to call a boiler engineer.
A61The gas valve and controller aren't talking to each otherThere could be damage to the valveThis will require you to call a boiler engineer.
A62Internal error with the controllerController part 041049G has erroredThis will require you to call a boiler engineer.
A63, A64 & F66DBM12 faultFault with the controllerThis will require you to call a boiler engineer.
F07The fume has got to excessive temperaturesExcessive temperature for 2 minutes or overLet it cool down & reset the boiler
F10Fault with the flow sensorThere is possibly damage to the sensor such as wiring issues or it's short circuitedThis will require you to call a boiler engineer.
F11Fault with the return sensorSensor wiring broken or shortedCheck the wiring issue if you're competent. If not call a boiler engineer.
F12DHW = Domestic How Water sensor faultThe sensor is damagedThis will require you to call a boiler engineer.
F13Fault with the exchange probeBroken or shorted wiringThis will require you to call a boiler engineer.
F14Issue with the fanThe fan is damaged or covered in debrisIf you can see it and clean it do, but if not this will require you to call a boiler engineer.
F15Electrical supply problemThe supply to the boiler has dropped below 170VIt's an electrical fault and you will need to call a boiler engineer.
F34Mains electric irregularityIssue with the electric supplyIt's an electrical fault and you will need to call a boiler engineer.
F35The systems water pressure is incorrectEither the pressure is too low, or the sensor is damagedCheck if the system needs filling, if not call a boiler engineer.
F37Fault with the external probeIt's damaged or short circuitedThis will require you to call a boiler engineer.
F39Activation of the exchanger protection systemPotential issues include no circulation through the system, damaged sensor or air in the systemThis will require you to call a boiler engineer.
F43Fault with the flow sensorThe sensor is damagedYou need to change the sensor which will require you to call a boiler engineer.
F52041049G0 fault with the controllerInternal controller errorIt's an electrical fault and you will need to This will require you to call a boiler engineer.

Ferroli Modena HE System

This model series is the same as the above, but the system version as opposed to combi. Just like the combi model, these are known as reliable and trusted. Here are the error codes that can be displayed on Modena HE system boilers:

Modena system boilers have the same error codes as the combi version with the exception of the part numbers being slightly different.

Ferroli i Series

The i series boilers are any boilers in the range that are simply called i[kw number]. These are generally compact boilers and are reliable and extremely efficient. There generally a bit cheaper than other models and therefore might not last quite as long. Here are the error codes you can get from the i series boilers:

Fault CodeDescription of ErrorThe Possible CauseAdvised Solution
A01The burner is not ignitingThere is no gas or an issue with the ignition - if the latter it could be the detection electrode,
with detection electrode, faulty gas valve or poor gas pressure.
Ensure that your gas is working fine & reset the boiler. If the error still occurs, call a boiler engineer.
A02The burner is off but the flame signal is presentPCB or electrode errorBoth of these issues will require you to call a boiler engineer.
A03Damage to the heating sensorThere's air in the system or poor water circulationBleed your radiators & try restart the boiler. If this doesn't fix it, call a boiler engineer.
A06After the ignition phase there's no flameThis could be due to to a detection electrode, unstable flame, incorrect valve offset or flue gas, so a lot of things!This will require you to call a boiler engineer.
A09There is an error with the gas valveError with the gas valve or a wiring disconnectionThis will require you to call a boiler engineer.
A15The Fault F05 has occurred over 5x in the last 24hThe air pressure switch is likely the issueThis will require you to call a boiler engineer.
A23Error with the card parameterThe setting needs changingThis will require you to call a boiler engineer.
A24Error with the card parameterThe setting needs changingThis will require you to call a boiler engineer.
F04Wrong setting on the cardThe setting needs changingThis will require you to call a boiler engineer.
F05Contact error with the air pressure switchThere is something wrong with the flue it's not the right size or obstructedThis will require you to call a boiler engineer.
F07Error with the air pressure switchOn activation of the fan the contacts have closedReset the boiler
F10Error with the delivery sensorDisconnected or shorted wiringThis will require you to call a boiler engineer.
F11Error with the DHW sensor errorDisconnected or shorted wiringThis will require you to call a boiler engineer.
F34The supply voltage has dropped below 170VIssue with the electric supplyIt's an electrical fault and you will need to call a boiler engineer.
F35Mains electric frequency is faultyThere's an issue with the electric supplyThis will require you to call a boiler engineer.
F37Water pressure errorThe pressure is either too low or the switch is damagedReset the boiler, if it doesn't fix it, call a boiler engineer.
F43Intervention from the exchanger protectionAir in the system or no system waterFill the system - but if that doesn't fix it then call a boiler engineer.
F50DBM23B controller errorInternal error with the controllerThis will require you to call a boiler engineer.
F51DBM23B controller errorInternal error with the controllerThis will require you to call a boiler engineer.

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Mat

A complete novice trying to navigate in the world of DIY. I bought my first home about 2 years ago & ever since I've been trying to research & learn how best to tackle common household problems.

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