Ferroli boilers fault codes
Ferroli make one distinction that is genuinely more useful than most manufacturers manage, and it is worth learning before you look up any individual code. An A prefix means a permanent shutdown: the appliance has stopped and will stay stopped until somebody presses reset. An F prefix means a temporary shutdown that clears itself automatically as soon as the measured value comes back into range. So an F37 that appears and disappears is the appliance telling you the pressure is marginal, while an A01 is a hard lockout that needs intervention. Some faults escalate from one to the other — three F07 events inside twenty-four hours becomes an A04, and that promotion from temporary to permanent is the appliance saying a recurring problem has become a real one.
Where the code shows on a Ferroli
The code flashes on the display and clears by itself when normal operation resumes, which means an F-prefix fault can come and go without anyone seeing it. If the appliance is behaving oddly but shows nothing, that is worth knowing. On the Optimax and Modena ranges the code alternates with the flow temperature. Older Ferroli appliances indicate faults by LED pattern rather than by a numeric display, with the legend printed inside the case.
How to reset a Ferroli
Press the reset button for about one second — on most Ferroli appliances it is marked R or shown as a flame with a cross. Only A-prefix faults need this; F-prefix faults clear on their own and pressing reset does nothing for them. If the appliance locks out repeatedly on the same A code, the fault is real and further resets simply repeat a failed sequence.
Most common Ferroli faults
The Ferroli codes people look up most.
- A01Get it checkedThe burner failed to light and the appliance has locked out. Ferroli list a blocked siphon as a cause, which is worth checking early.
- F37Usually simple to fixSystem water pressure is outside the correct range. Because this is an F code it clears by itself once you top the system back up.
- A03Get it checkedHigh limit protection has operated. Ferroli point at circulation and at the flow sensor position, and both are worth checking.
- A05Get it checkedThe fan tachometer signal has been missing for an hour or more. The appliance has stopped and needs an engineer.
Every Ferroli fault code
6 published codes. Filtering happens in the page — every code is in the HTML.
Showing 6 of 6 codes
Ferroli models
Codes can differ between generations. Check yours.
Guides that help with Ferroli faults
How to repressurise a boiler
The five-minute job that resolves more no-heating calls than any other. Here is how to do it properly, and how to tell when topping up is the wrong answer.Read the guideWhat to do when your condensate pipe freezes
The single most common winter boiler fault, and one of the few you can genuinely fix yourself in fifteen minutes with a kettle and some patience.Read the guideBoiler fault codes explained: what they actually tell you
Codes look like diagnoses and are not. Understanding which family a code belongs to turns a meaningless number into a genuinely useful starting point.Read the guide
Looking for Ferroli’s own support? www.ferroli.com. We are not affiliated with Ferroli.