Intergas F010 Fault Code: Causes, Fixes & Repair Costs
What does the Intergas F010 fault code mean?
The F010 fault code on Intergas boilers (including the Xtreme and Xclusive ranges) indicates a problem with the S0 temperature sensor, which sits at the top left of the primary heat exchanger. This sensor is an NTC (Negative Temperature Coefficient) thermistor — a small component that monitors water temperature inside the heat exchanger to help the boiler control burner output, prevent overheating, and avoid unnecessary short cycling. When the boiler's PCB receives a reading from the S0 sensor that falls outside the expected range — or receives no signal at all — it interprets this as a fault, triggers a lockout, and displays F010 on the screen with a flashing red indicator. The boiler will not fire for heating or hot water until the fault is resolved and the unit is reset.
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
- Faulty or degraded S0 sensor Common
The S0 NTC thermistor is the most common culprit. Over time, thermistors can drift out of their calibrated resistance range or fail entirely, causing the PCB to detect an implausible temperature reading and lock the boiler out. Resistance checks by an engineer will quickly confirm whether the sensor itself is at fault.
- Damaged or loose wiring to the S0 sensor Common
The wiring loom connecting the S0 sensor to the PCB can suffer from loose terminals, corrosion at the connectors, or physical damage — all of which can produce intermittent or absent signals that the PCB reads as a sensor fault. Engineers will inspect the full length of the wiring and the connector pins before condemning the sensor itself.
- Incorrectly seated or poorly mounted sensor Sometimes
If the S0 sensor has not been clipped or secured properly against the heat exchanger — for example, following a previous repair or service — it may not make adequate thermal contact. This leads to inaccurate readings that fall outside acceptable limits and trigger F010.
- PCB failure Rare
If the sensor and its wiring both test within specification, attention turns to the PCB itself. A faulty PCB may misinterpret valid sensor signals or fail to supply the correct reference voltage to the sensor circuit. PCB faults are relatively uncommon compared to sensor or wiring issues, but they do occur, particularly on older boilers.
How to fix it
- Check that your gas supply is active DIY safe
Before assuming the boiler has a serious fault, confirm that other gas appliances in your home (such as a gas hob) are working normally. If there is no gas supply, contact your gas supplier rather than a boiler engineer.
- Reset the boiler once DIY safe
Press and hold the reset button on your Intergas boiler as described in your user manual. Intergas boilers are designed to be reset only after the underlying problem has been identified and resolved — resetting is not a fix, but a single attempt is reasonable to see whether the fault clears. If F010 returns immediately or after a short time, do not keep resetting; move to the next step.
- Check boiler system pressure DIY safe
Glance at the pressure gauge. Intergas boilers typically require between 1.0 and 1.5 bar when cold. If pressure is low, top up via the filling loop according to your user manual. Low pressure alone will not cause F010, but it is worth ruling out before calling an engineer.
- An engineer should check the S0 sensor resistance Gas Safe engineer
A Gas Safe registered engineer will disconnect the S0 sensor and use a multimeter to measure its resistance across the operating temperature range. If the reading deviates significantly from the values in the Intergas engineer parameters document, the sensor should be replaced.
- An engineer should inspect the S0 sensor wiring and connectors Gas Safe engineer
The engineer will trace the wiring from the S0 sensor back to the PCB, checking for loose terminals, corrosion, pinched cables, or heat damage. A damaged wire or corroded connector is often a quick and inexpensive fix if caught early.
- An engineer should check and re-seat the S0 sensor if necessary Gas Safe engineer
If the sensor and wiring both check out, the engineer will verify that the sensor is correctly positioned and firmly attached to the heat exchanger. Poor thermal contact can produce erratic readings without the sensor or wiring being defective.
- An engineer should replace the S0 sensor if it is confirmed faulty Gas Safe engineer
If resistance tests confirm the sensor has failed, the engineer will fit a replacement NTC thermistor. This is typically the most cost-effective repair for an F010 fault and should resolve the lockout once the boiler is reset.
- An engineer should investigate and replace the PCB if all other causes are ruled out Gas Safe engineer
If the sensor, wiring, and mounting all test correctly, the PCB is the remaining suspect. PCB replacement is a more involved and costly repair, but it is sometimes unavoidable. On older boilers, this is also a good point to discuss with your engineer whether repair or replacement of the boiler represents better value.
- Call a Gas Safe registered engineer Gas Safe engineer
All diagnostic and repair work on the internal components of an Intergas boiler — including the S0 sensor, wiring loom, and PCB — must be carried out by a Gas Safe registered engineer. You can find a local registered engineer at gassaferegister.co.uk. Always ask to see their Gas Safe ID card before work begins.
Parts you may need
- S0 NTC thermistor sensor (Intergas compatible) · from £45
- Sensor wiring loom / connector harness · from £30
- Intergas PCB (model-dependent) · 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 £150–£350, depending on the underlying cause.
Frequently asked questions
Can I reset my Intergas boiler to clear the F010 fault myself?
You can attempt a single reset using the reset button on the boiler's control panel — this is described in your Intergas user manual and is safe for homeowners to try. However, Intergas designs the reset function to be used after a fault has been identified and fixed, not as a remedy in itself. If F010 returns after resetting, the underlying sensor or wiring problem still exists and you will need a Gas Safe registered engineer to diagnose and repair it. Repeatedly resetting the boiler will not fix the fault and could potentially mask a developing problem.
How much does it cost to fix an Intergas F010 fault in the UK?
For most people, the repair involves either a wiring check or an S0 sensor replacement, which typically costs between £150 and £350 including parts and labour. The S0 sensor itself is a relatively affordable component (around £30–£50 for the part), so if the sensor alone needs replacing it tends to be at the lower end of that range. If the PCB turns out to be the cause, costs rise considerably — PCB replacement on an Intergas boiler generally runs to £350–£500 or more depending on the model and your location. Regional labour rates also vary: engineers in London and the South East typically charge more than those in the North of England or Scotland. If your boiler is still under warranty (Intergas offers up to 10 years on some models), the repair may be covered — check your warranty documents first.
What is the S0 sensor on an Intergas boiler and where is it located?
The S0 sensor is an NTC (Negative Temperature Coefficient) thermistor — a small temperature-sensing component that monitors water temperature at the top left of the Intergas heat exchanger. It feeds real-time temperature data to the PCB so the boiler can regulate burner output accurately, preventing overheating and improving efficiency. Because it sits directly on the heat exchanger, it is an internal component that only a Gas Safe registered engineer should handle.
My Intergas boiler keeps showing F010 — could it be something other than the sensor?
Yes. Although a failed or out-of-range S0 sensor is the most frequent cause of F010, loose or corroded wiring between the sensor and the PCB is almost equally common and is often a cheaper fix. A poorly seated sensor that has slipped out of position can also trigger the code without the sensor itself being defective. In a small number of cases the PCB is at fault, misreading a perfectly good sensor signal. A Gas Safe engineer will work through these possibilities systematically — starting with resistance checks on the sensor and a wiring inspection — before recommending any parts replacement.