Chaffoteaux 271 Fault Code: Causes, Fixes & Repair Costs
What does the Chaffoteaux 271 fault code mean?
Fault code 271 on Chaffoteaux boilers is not listed in publicly available UK documentation, but on models that use three-digit numeric codes — such as certain Talia and Minima HE variants — codes in the 2xx range are consistently associated with fan operation, air pressure switch, or flue draught faults. The boiler has detected an abnormal condition in this circuit and has locked out as a safety precaution. Because Chaffoteaux fault codes differ between model ranges and production years, you should always confirm the exact meaning against your boiler's installation manual or by calling Chaffoteaux/Ariston UK support with your full model number to hand. That said, the fan and air-pressure-switch family of faults is the most plausible interpretation for 271, and the diagnostic and repair steps on this page will cover the likely causes.
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
- Fan fault or failure Common
The boiler fan creates the draught needed to exhaust combustion gases safely. If the fan runs too slowly, stalls, or fails to start — due to a worn motor, blocked impeller, or a wiring fault — the air pressure switch will not confirm safe conditions and the boiler locks out. This is the most common cause of 2xx-range faults on Chaffoteaux boilers.
- Air pressure switch fault Common
Even when the fan is running normally, a faulty or stuck air pressure switch may fail to signal the PCB that safe draught has been established. The diaphragm inside the switch can split or the connecting hose can become blocked or disconnected, preventing the switch from operating correctly.
- Blocked or restricted flue Sometimes
A partial blockage in the flue or air-inlet duct — caused by debris, bird nesting material, or ice in very cold weather — restricts airflow and prevents the air pressure switch from closing. The boiler detects the insufficient draught and shuts down for safety.
- Condensate pipe blockage or frozen pipe Sometimes
A frozen or blocked condensate pipe can cause back-pressure in the system that affects air pressure readings. In cold weather, a white plastic pipe exiting through an outside wall is a common culprit and is one of the few issues a homeowner can safely address.
- PCB (printed circuit board) fault Rare
If all other components test correctly, a fault on the PCB itself may be misreading fan speed signals or air pressure switch inputs, triggering a spurious lockout. PCB faults are less common but should be considered once other causes have been ruled out by an engineer.
How to fix it
- Check whether other gas appliances in your home are working DIY safe
Turn on a gas hob or check a gas fire. If nothing is working, there may be a supply interruption — contact your gas supplier. If other appliances work fine, the issue is specific to the boiler.
- Inspect the external condensate pipe for freezing DIY safe
In cold weather, locate the white plastic pipe (typically 21–32 mm diameter) that exits through an outside wall, usually low down. If it is frozen solid, carefully pour warm — not boiling — water along the pipe to thaw it, or wrap a warm damp cloth around it. Once thawed, attempt a reset.
- Check the system pressure gauge DIY safe
Look at the pressure gauge on the boiler front panel. It should read between 1.0 and 1.5 bar when the system is cold. If it has dropped below 1 bar, repressurise using the filling loop (refer to your boiler manual for the exact procedure) until it reaches about 1.2 bar, then close the filling loop valves fully.
- Reset the boiler once DIY safe
Press the reset button on the control panel and hold it for the time specified in your manual (typically 3–5 seconds). Allow the boiler to complete its start-up sequence. If it fires up and runs normally, monitor it over the next day or two. Do not reset more than two or three times in total — repeated lockouts indicate a genuine fault that needs professional attention.
- Check for obvious flue obstructions from outside DIY safe
From outside the property, visually inspect the flue terminal (the grille or cap on an external wall or roof). Look for bird nesting material, leaves, or ice blocking the opening. Do not attempt to reach or probe the flue terminal yourself; if you spot a blockage, report this to the engineer.
- Have a Gas Safe engineer inspect the fan assembly Gas Safe engineer
A registered engineer will check fan speed, motor current, and impeller condition. The fan may need cleaning, lubricating, or replacing. Only a Gas Safe registered engineer should remove boiler casing or work on internal components.
- Have the air pressure switch and connecting hose tested Gas Safe engineer
The engineer will test the air pressure switch with a manometer and inspect the rubber hose linking it to the fan assembly for splits, blockages, or loose connections. A faulty switch is relatively straightforward to replace.
- Have the flue system inspected internally Gas Safe engineer
The engineer will check the full flue run for restrictions, incorrect falls, or damage that could reduce draught below safe operating levels.
- Have the PCB diagnosed if all other components are satisfactory Gas Safe engineer
If the fan, air pressure switch, and flue all check out, the PCB may be generating a false fault signal. The engineer will test the board's outputs and, if defective, replace it. Always confirm that your boiler model is correctly identified before a PCB is ordered, as Chaffoteaux PCBs are model-specific.
- Call a Gas Safe registered engineer Gas Safe engineer
If the fault persists after the homeowner checks above, or if you are unsure of the cause at any point, book a Gas Safe registered engineer. All internal boiler work — including fan, air pressure switch, PCB, and flue inspection — is legally required to be carried out by a Gas Safe registered professional. You can verify an engineer's registration at GasSafeRegister.co.uk.
Parts you may need
- Boiler fan/fan motor assembly · from £120
- Air pressure switch · from £35
- Air pressure switch connecting hose · from £12
- PCB (printed circuit board) · from £220
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
Why can't I find fault code 271 in my Chaffoteaux manual?
Chaffoteaux produces several different boiler ranges — including the Talia, Minima HE, Serelia, and older models — and each generation can use a different fault-code scheme. Some older models don't have a digital display at all and use flashing LED combinations instead. Code 271 is not listed in any publicly available UK Chaffoteaux manual, which suggests it may be specific to a particular model variant or firmware version. Your best first step is to check the sticker inside your boiler's front casing for the exact model and serial number, then call Chaffoteaux/Ariston UK support (part of the Ariston Thermo Group) and quote both the code and model number.
Is it safe to keep resetting my Chaffoteaux boiler showing fault 271?
You can try one reset as a first step, but you should not keep pressing reset repeatedly. The boiler locks out to protect you — if it is a genuine fan or flue fault, repeated resets will not fix the underlying problem and could mask a developing safety issue. If the boiler locks out again after a single reset, stop resetting and call a Gas Safe registered engineer to diagnose the cause.
How much does it typically cost to fix a fan or air pressure switch fault on a Chaffoteaux boiler?
For the most common repairs in this fault family — fan replacement or air pressure switch replacement — most UK homeowners pay between £150 and £380 including labour and parts. A diagnostic call-out alone is usually £60–£100. If the fault turns out to be the PCB, costs can rise significantly; a PCB replacement including labour typically runs £350–£550 or more depending on model and region. London and South East engineers generally charge at the higher end of these ranges.
My Chaffoteaux boiler is over 10 years old and showing this fault — should I repair or replace it?
Chaffoteaux boilers typically have a reliable service life of around 10–15 years with annual servicing. If yours is approaching or past that age and needs a major component like a fan assembly or PCB, it is worth getting a quote for a new boiler at the same time as the repair estimate. A new A-rated condensing boiler will also be noticeably more efficient than an older Chaffoteaux model, so the running-cost savings can offset the replacement cost over a few years. Ask your Gas Safe engineer to give you both options so you can make an informed decision.