Intergas F007 Fault Code: Causes, Fixes & Repair Costs
What does the Intergas F007 fault code mean?
The F007 code appears on Intergas boilers — primarily the Xclusive and Xtreme ranges — when the boiler's control board cannot detect enough of an electrical signal from the flame-sensing electrode to confirm a stable burner flame is present. The ionisation electrode works by passing a tiny current through the burner flame; if the signal falls below the expected threshold, the boiler treats it as a flame failure and locks out as a safety precaution, cutting the gas supply. In short: the boiler lit (or tried to light) but couldn't verify the flame was actually there, so it shut itself down.
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
- Dirty or degraded ionisation electrode Common
Over time, carbon deposits and oxidation build up on the electrode tip, insulating it and reducing the ionisation signal it can produce. This is the single most common reason for F007, particularly on boilers that haven't been serviced recently or are more than three years old. The electrode gradually burns away through normal use and eventually can no longer generate a reliable reading.
- Loose, corroded, or damaged wiring to the electrode Common
The low-voltage lead connecting the ionisation electrode to the PCB is thin and can become corroded at the connector, chafed against the heat exchanger, or simply work loose over time. Even a slightly poor connection here is enough to drop the signal below the detection threshold and trigger F007.
- Electrode incorrectly positioned or misaligned Sometimes
If the electrode tip is not sitting in precisely the right position within the burner flame, the signal it picks up will be weak or intermittent. This can happen after a service where the electrode was disturbed but not refitted correctly, or following any internal work on the boiler.
- Failed ionisation electrode requiring full replacement Sometimes
If cleaning and repositioning don't resolve the fault, the electrode itself may have worn beyond recovery. Electrodes are consumable parts that Intergas — like most manufacturers — expects to be replaced at service intervals, roughly every three to five years depending on condition.
How to fix it
- Reset the boiler once DIY safe
Press and hold the reset button (usually marked with a flame or 'R' symbol on Intergas boilers) for a few seconds until the display clears. If the boiler fires and runs normally, monitor it for the next hour. If F007 returns immediately or after a short run, move on — repeated resets without resolving the underlying fault won't help and may indicate a more established problem.
- Check your gas supply is live DIY safe
Make sure other gas appliances in your home (a gas hob, for example) are working. If there's no gas getting through, the boiler would fail to establish a flame and could throw a related code. If you have no gas supply at all, contact your gas supplier rather than an engineer.
- Do not attempt to access or clean internal components yourself Gas Safe engineer
The ionisation electrode sits inside the combustion chamber. Accessing it requires removing the boiler casing and working close to the burner and gas components — this is work that must only be carried out by a Gas Safe registered engineer. There is no homeowner-safe workaround for this step.
- Book a Gas Safe registered engineer to inspect the electrode and wiring Gas Safe engineer
An engineer will remove the burner assembly, visually inspect the electrode tip for carbon fouling or wear, and clean it if it is still serviceable. They will also check the wiring loom from the electrode back to the PCB, looking for corrosion, loose pins, or damage to the insulation. In many cases, a clean and a wiring check is all that's needed.
- Replace the ionisation electrode if cleaning doesn't resolve the fault Gas Safe engineer
If the electrode is worn, pitted, or cracked, the engineer will fit a new one. Intergas electrodes are straightforward to source and replace. After refitting, the engineer will run the boiler through a full ignition sequence and confirm the ionisation signal is back within specification before signing off the repair.
Parts you may need
- Intergas ionisation / ignition electrode · from £45
- Electrode connecting lead / ignition pin wiring · from £25
- Burner gasket (replaced if burner is removed) · from £12
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 £90–£220, depending on the underlying cause.
Frequently asked questions
Can I fix Intergas F007 myself?
No — not beyond resetting the boiler and checking the gas supply is on. The electrode and its wiring are inside the combustion section of the boiler, and working in that area requires Gas Safe registration. Attempting it yourself risks personal safety, will almost certainly void any remaining warranty, and is a legal grey area under UK gas safety regulations. Call a Gas Safe registered engineer.
How much does it cost to fix F007 on an Intergas boiler?
Most people pay somewhere between £90 and £220 all in, covering the engineer's callout, labour, and parts. A clean and wiring check at the lower end, or a full electrode replacement at the higher end, both comfortably fall within that range. If the PCB has been damaged by a prolonged wiring fault, costs can rise significantly beyond this — a new PCB on an Intergas can be £200–£400 for parts alone — but that scenario is uncommon with F007.
How often should the ionisation electrode be replaced on an Intergas boiler?
Intergas and most industry guidance suggests inspecting the electrode at every annual service and replacing it roughly every three to five years, or sooner if it shows visible wear, pitting, or cracking. Electrodes are classed as consumable parts and are generally not covered under the boiler warranty for this reason. Keeping up with annual services is the best way to catch electrode wear before it causes a lockout.
My Intergas boiler keeps showing F007 after reset — is it serious?
A fault that returns quickly after reset points to a genuine component issue rather than a one-off glitch. It's worth getting it looked at promptly rather than repeatedly resetting, as running the ignition cycle repeatedly without a confirmed flame can put additional wear on other components. The repair itself is usually straightforward and inexpensive, so there's little benefit in delaying.