Intergas F014 Fault Code: Causes, Fixes & Repair Costs
What does the Intergas F014 fault code mean?
The F014 code tells you that the boiler's control board has detected a problem with the S0 temperature sensor — the sensor responsible for monitoring the heat exchanger itself. Either the sensor has shifted out of its correct position, or the readings it is producing fall outside the acceptable range, prompting the boiler to lock out as a precaution. This is distinct from F015 (which relates to the S1 flow temperature sensor) and F016 (which covers the S3 domestic hot water sensor); F014 is exclusively about the S0 heat exchanger sensor.
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
- S0 sensor physically dislodged or incorrectly seated Common
Vibration during normal boiler operation — or a loose fit at the time of installation — can cause the S0 sensor to work free from its mounting point on the heat exchanger. When it is no longer making proper contact, the readings the control board receives become unreliable and the lockout is triggered.
- Failed or defective S0 sensor Common
Even when the sensor appears physically secure, it may have failed internally and be producing readings that are absent or outside the expected range. Sensors can degrade over time due to prolonged heat exposure.
- Wiring or connector fault Sometimes
The cable or connector linking the S0 sensor to the PCB may be damaged, corroded, or have worked loose. This interrupts the signal and can produce the same effect as a faulty or missing sensor.
- PCB fault Sometimes
If the printed circuit board itself is malfunctioning, it may misinterpret or fail to receive the signal from an otherwise healthy S0 sensor. A PCB fault is typically suspected only once the sensor and wiring have been ruled out.
- Limescale or heat exchanger damage Rare
In hard-water areas, heavy limescale deposits on the heat exchanger can interfere with how the sensor sits against the component or cause localised overheating that throws readings out of tolerance.
How to fix it
- Check whether your boiler is still within its warranty period DIY safe
Intergas boilers come with a minimum 12-month warranty, and many models carry extended cover of 3–10 years depending on the model and registration. If your boiler is relatively new, contact Intergas directly on 01527 888000 (Monday–Friday 8am–5pm, Saturday 9am–12pm) before spending anything on a repair — the work may be carried out at no cost to you.
- Turn off the hot water pre-heat function DIY safe
Switching off the hot water pre-heat setting via the boiler's controls can temporarily reduce the frequency with which the fault presents while you wait for an engineer. The boiler does not need to be isolated at the mains — it is safe to leave it powered on in the meantime.
- Do not repeatedly reset the boiler as a remedy DIY safe
The reset button is intended to restart normal operation after an underlying fault has already been found and fixed — not as a cure for the fault itself. Repeatedly resetting the boiler without addressing the root cause will not clear an F014 and may mask useful diagnostic information for the engineer.
- Have a Gas Safe engineer inspect and reseat the S0 sensor Gas Safe engineer
The engineer will access the heat exchanger and check whether the S0 sensor has simply come loose from its mounting bracket or pocket. In many cases, correctly reseating and securing the sensor resolves the fault without any parts being needed, keeping the cost to a minimum.
- Have the engineer test the S0 sensor with a multimeter Gas Safe engineer
If the sensor is physically secure but the fault persists, the engineer will test its electrical resistance and output with a multimeter to confirm whether it is producing readings within the correct range. A sensor that fails this test will need replacing with a genuine Intergas part.
- Replace the S0 sensor if confirmed faulty Gas Safe engineer
Intergas recommends using only genuine manufacturer parts. Fitting a like-for-like replacement sensor and correctly seating it in its mounting position will clear the fault on the majority of F014 calls once the sensor has been confirmed as the cause.
- Check the wiring loom and PCB if the fault persists Gas Safe engineer
Should reseating and replacing the sensor not resolve the issue, the engineer will trace the wiring back to the PCB looking for damaged insulation, corroded connectors, or loose terminals. If the PCB is found to be at fault, replacement will be required — at this cost level it is worth discussing with the engineer whether repair or a new boiler represents better long-term value, particularly for boilers over ten years old.
Parts you may need
- Intergas S0 heat exchanger temperature sensor · from £35
- Sensor wiring loom / connector harness · from £30
- Intergas 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 £100–£280, depending on the underlying cause.
Frequently asked questions
Can I reset my Intergas boiler to clear the F014 code?
You can press the reset button once the underlying fault has been found and corrected, as it is the mechanism for bringing the boiler out of lockout. However, resetting before anything has been fixed will not clear the F014 — the code will simply return, sometimes immediately. Avoid pressing reset repeatedly, as it will not help and may obscure useful information for the engineer.
How much will an F014 repair typically cost?
For most homeowners, the bill falls somewhere between £100 and £280. If the S0 sensor just needs reseating with no parts required, you are likely looking at an engineer's call-out fee in the region of £80–£150. If the sensor itself has failed, add roughly £35–£60 for the part, bringing the total to around £120–£250. In the less common scenario where the PCB needs replacing, costs rise significantly — typically £350–£500 all in — and at that point it is worth having an honest conversation with your engineer about whether a new boiler might be a more cost-effective long-term investment.
Is my Intergas boiler still under warranty?
Intergas offer a standard 12-month warranty as a minimum, but many of their models — including the Xtreme and Xclusive ranges — carry extended warranties of 3–10 years, often subject to annual servicing conditions. You can check your warranty status or book a covered repair by calling Intergas directly on 01527 888000. If the boiler is still within its warranty period, the F014 repair may cost you nothing at all.
What is the S0 sensor and why does it matter?
The S0 sensor is a small temperature-sensing component mounted directly on the heat exchanger — the part of the boiler that transfers heat from the burner into the central heating water. It continuously monitors the heat exchanger's temperature so the control board can keep combustion safe and efficient. If the S0 sensor is absent, loose, or defective, the boiler has no reliable way to know whether the heat exchanger is operating within safe limits, which is why it shuts down and displays F014 rather than continuing to fire.