Ferroli A61 Fault Code: Causes, Fixes & Repair Costs
What does the Ferroli A61 fault code mean?
The A61 is a lockout fault on Ferroli boilers — codes starting with 'A' always require a manual reset to clear, unlike 'F' codes which may resolve on their own. This particular code means the main control board has lost communication with the gas valve controller. In plain terms, the PCB cannot send or receive signals to and from the gas valve, so the boiler has no safe way to regulate gas flow. As a safety measure, it shuts itself down completely and locks out. The closely related code F61 indicates an internal PCB (AGC01) error; if your display is showing F61 rather than A61, the fault sits within the board itself rather than in the communication link to the valve.
General guidance only — not a substitute for professional advice, and not certified by a Gas Safe engineer. Always have your specific appliance assessed by a qualified professional. Any gas work must be carried out by a Gas Safe registered engineer. If you smell gas or suspect carbon monoxide, leave the property and call the National Gas Emergency line on 0800 111 999.
Common causes
- Wiring loom fault between PCB and gas valve Common
The most frequent cause. The cable harness connecting the control board to the gas valve can develop loose terminals, corroded pins, or a break in the wire itself — especially on older Ferroli models. Even a partially broken connection is enough to trigger A61 because the board receives no valid response from the valve controller.
- Faulty or failed gas valve Sometimes
If the wiring checks out, the gas valve itself may have failed internally. The valve contains its own electronics that communicate back to the PCB, and if that circuitry fails, the communication link drops and the lockout is triggered. This is more common on boilers that have seen several years of use.
- PCB (control board) failure Rare
Less commonly, the fault lies with the PCB rather than the valve. If the board's output driver or communication port has failed, it cannot initiate or maintain the dialogue with the valve even if the valve is perfectly healthy. F61 is the closer indicator of a pure PCB fault, but A61 can also result from a board that is partially functional.
How to fix it
- Check that the gas supply to the property is live DIY safe
Make sure other gas appliances in the home — cooker, hob, or gas fire — are working normally. If nothing is working on gas, contact your gas supplier rather than the boiler engineer. If gas supply is confirmed, move on to the next step.
- Attempt a single manual reset of the boiler DIY safe
Locate the reset button on your Ferroli boiler (usually a flame symbol or marked 'Reset') and hold it for a few seconds as described in your user guide. If the boiler fires up and runs normally, monitor it closely over the next few hours. If A61 returns straight away or after a short while, do not keep resetting — repeated lockouts on this code indicate a genuine component fault that needs an engineer.
- Arrange for a Gas Safe registered engineer to inspect the wiring loom Gas Safe engineer
The engineer will isolate the boiler and check the cable harness that runs between the PCB and the gas valve. They will look for loose or corroded terminals, chafed insulation, and any breaks in continuity. This step alone often identifies and resolves the fault if a connector has simply worked loose.
- Gas valve replacement if wiring is sound Gas Safe engineer
If the wiring loom is undamaged and connections are secure, the next step is to test the gas valve itself. A Gas Safe engineer must carry out this work as it involves a gas-carrying component. If the valve has failed, it will be replaced with a compatible Ferroli unit and the boiler retested for safe operation.
- PCB replacement if valve and wiring are both confirmed good Gas Safe engineer
Should the valve and wiring both test correctly, the control board is likely to be at fault. PCB replacement on Ferroli boilers involves sourcing the correct board (availability can be an issue on older models), fitting it, and re-commissioning the boiler. On boilers over ten years old, the engineer may advise weighing the PCB cost against a full boiler replacement.
- Call a Gas Safe registered engineer if the fault persists or you have not already done so Gas Safe engineer
A61 is not a fault that can be resolved without professional diagnosis. If the reset did not hold, or you are unsure of anything, contact a Gas Safe registered engineer. You can verify registration at gassaferegister.co.uk. If at any point you smell gas, leave the property immediately without operating any switches and call the National Gas Emergency Service on 0800 111 999.
Parts you may need
- Ferroli gas valve (compatible replacement) · from £120
- Ferroli PCB / control board · from £180
- Wiring loom / cable harness · from £35
The exact spare depends on your boiler's GC number (on the data badge). Check this against the part before buying.
Typical repair cost
Expect to pay roughly £150–£380, depending on the underlying cause.
Frequently asked questions
Can I reset a Ferroli A61 fault myself?
Yes, a single reset attempt is safe for a homeowner to try. Hold the reset button as described in your Ferroli user guide. However, if the A61 code returns after one or two resets, stop there. Repeated resets won't fix an underlying wiring or component fault, and continuing to force the boiler to attempt ignition without a proper diagnosis can make diagnosis harder for the engineer.
What is the difference between Ferroli fault codes A61 and F61?
Both codes relate to the gas valve communication circuit, but they point to slightly different locations. A61 is a lockout fault indicating that communication between the main PCB and the gas valve controller has failed — the likely culprits are the wiring loom or the gas valve itself. F61 is described as an internal PCB (AGC01) error, pointing more directly at the control board. Either way, a Gas Safe engineer is needed, but the distinction can help them narrow down the diagnosis more quickly.
How much does it cost to fix a Ferroli A61 fault?
Most homeowners pay between £150 and £380 all-in for this repair. A simple wiring loom fix or loose connection is at the lower end. A gas valve replacement typically comes in at £250–£350 including parts and labour on a Ferroli. PCB replacement sits in a similar range, though some Ferroli boards — particularly for older Modena models — can cost over £300 for the part alone, pushing the total higher. If your boiler is over ten years old, it is worth asking your engineer whether repair represents good value against the cost of a new boiler.
My Ferroli is over ten years old — should I repair it or replace it?
This is worth thinking through carefully. If the repair quote is approaching 30–40% of what a new boiler would cost, most heating engineers and consumer advice bodies suggest replacement is the sounder investment. A new A-rated condensing boiler will also be significantly more efficient than an older Ferroli, reducing your gas bills. Get a repair quote and a replacement quote side by side before committing either way. Note that standard home insurance rarely covers boiler breakdowns — dedicated boiler cover or a home emergency policy is the usual route if you want ongoing protection.