Chaffoteaux 214 Fault Code: Causes, Fixes & Repair Costs
What does the Chaffoteaux 214 fault code mean?
Fault code 214 on Chaffoteaux boilers signals a problem with the domestic hot water (DHW) temperature sensor. The '2' prefix in Chaffoteaux's fault-code numbering system identifies the DHW circuit as the affected area, while the digits '14' point specifically to the temperature sensor within that circuit. In practice, the boiler's control board (PCB) is failing to receive a valid temperature reading from the hot water side — either the sensor itself has developed a fault, the electrical connection between sensor and PCB has broken down, or in rarer cases the PCB itself is at fault. Because reliable temperature data is essential for safe operation, the boiler shuts down hot water production until the issue is resolved. This code appears consistently across modern Chaffoteaux ranges including the Talia, Inoa, and Pigma series.
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
- Failed DHW NTC thermistor Common
The DHW temperature sensor is a small NTC thermistor — a component whose electrical resistance changes predictably with temperature. Over time, thermistors can fail internally due to a broken circuit or a short circuit, producing readings that are wildly out of range or absent altogether. At room temperature (around 25°C) a healthy Chaffoteaux DHW thermistor should read approximately 8.1–8.6 kΩ; a reading of zero or infinite resistance confirms the component has failed and needs replacing.
- Loose, corroded, or damaged wiring connector Common
The wiring loom that connects the DHW sensor to the PCB can suffer from oxidised pins, loose push-fit connectors, or insulation damage caused by prolonged heat exposure inside the boiler casing. Even a slightly poor connection can cause intermittent or missing resistance readings, triggering fault code 214 without the thermistor itself being defective.
- Scale or corrosion on the sensor body Sometimes
In hard-water areas, limescale can build up around the sensor where it contacts the DHW flow, insulating it from the water temperature and causing inaccurate readings. Corrosion around the sensor housing can also impair contact. This tends to develop gradually and may cause the fault to appear first as an intermittent issue before becoming permanent.
- Faulty PCB (printed circuit board) Rare
If the thermistor tests within specification and all wiring connections are sound, the fault may lie with the PCB itself. The PCB processes the resistance signal from the sensor; a damaged input circuit, burnt track, or failed component on the board can prevent it from interpreting a perfectly good sensor signal. Visible signs include discolouration, deformation, or signs of overheating on the board surface.
How to fix it
- Reset the boiler once DIY safe
Press and hold the reset button on your Chaffoteaux boiler as described in your user guide. If the fault clears and the boiler runs normally, monitor it over the next hour or two. A single successful reset after a transient glitch is acceptable, but do not attempt more than two or three resets in total — repeated resets on a persisting fault can mask a genuine safety issue and, on some models, may lock the boiler out further.
- Check that your gas supply is working DIY safe
Confirm that other gas appliances in your home (hob, gas fire) are operating normally. If they are not, contact your gas supplier rather than resetting the boiler repeatedly. A temporary interruption to the gas supply can occasionally trigger sensor-related faults.
- Check the system pressure DIY safe
Look at the pressure gauge on your boiler — it should read between 1.0 and 1.5 bar when cold. If it is below 1 bar, top it up via the filling loop following the instructions in your Chaffoteaux user manual. Low pressure alone will not cause code 214, but it is good practice to rule out multiple concurrent issues before calling an engineer.
- Visually inspect accessible wiring around the boiler (do not remove the boiler casing) DIY safe
With the boiler switched off at the mains, take a look at any wiring visible at the front of the boiler without removing panels. Look for obvious signs of chafing, burnt insulation, or connectors that have worked loose at external junction points. Do not open the boiler casing — internal wiring and components must only be inspected by a Gas Safe registered engineer.
- Call a Gas Safe registered engineer to diagnose and repair the fault Gas Safe engineer
If the fault code 214 returns after a reset, or the boiler will not reset at all, you need a Gas Safe registered engineer. The engineer will open the boiler casing safely, use a multimeter to test the DHW NTC thermistor's resistance, inspect the wiring loom and connector pins for oxidation or damage, and replace the sensor if it is out of specification. If a new sensor does not clear the fault, they will assess the PCB for signs of damage and advise on repair or replacement accordingly.
Parts you may need
- DHW NTC thermistor (e.g. Ariston/Chaffoteaux part 61000733) · from £20
- Wiring loom / sensor connector harness · from £35
- Chaffoteaux PCB (main control board) · from £280
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 £100–£280, depending on the underlying cause.
Frequently asked questions
Can I fix Chaffoteaux fault code 214 myself?
The only safe DIY steps are a single boiler reset and a visual check of external wiring. All internal work — testing the thermistor, replacing it, or inspecting the PCB — must be carried out by a Gas Safe registered engineer. It is a legal requirement in the UK for anyone working on a gas appliance to hold current Gas Safe registration.
How much does it cost to fix fault code 214 on a Chaffoteaux boiler?
For a straightforward DHW thermistor replacement, expect to pay roughly £100–£280 all in (parts plus one to two hours of labour). The thermistor itself is an inexpensive part — typically £15–£40 — so most of the cost is engineer time. If the PCB turns out to be faulty as well, a replacement board can add £200–£400 to the bill, so it is worth getting a clear diagnosis before committing to the repair.
Why does my Chaffoteaux boiler show code 214 but still heat the radiators?
Fault code 214 specifically affects the DHW (hot water) circuit sensor, so in some cases the central heating function may continue to operate while hot water production is blocked or unreliable. The boiler uses separate sensors and controls for heating and hot water, which is why one can fail independently of the other. You should still get the fault diagnosed promptly — running a boiler with a sensor fault long-term can put additional strain on the PCB.
My Chaffoteaux boiler keeps coming back with code 214 after I reset it — what does that mean?
A fault code that keeps returning after resets almost always indicates a genuine component failure rather than a one-off glitch. In the case of 214, the most likely culprit is the DHW NTC thermistor or its wiring connection. Repeated resets will not fix the underlying issue and may shorten the life of other components. Book a Gas Safe engineer to carry out a proper diagnosis — the repair is usually straightforward and relatively affordable if it turns out to be just the sensor.