Intergas Boiler Error Code F005
With F005 the flame drops out while burning. A well-known cause is recirculation: flue gases come back into the boiler, for example because of a blocked flue outlet. Check the outlet outside and reset once; after that, adjustment and checking is a job for an installer.
Applies to: Intergas Xtreme
Common causes
- Incorrect adjustment of the gas valve
- Recirculation or blockage of flue gases in the flue
- Poor internal earthing
What to check, in order
- Check outside whether the flue outlet is clear of leaves, plants or ice, and clear the outlet if needed.
- Check that the boiler is plugged into an earthed socket.
- Reset the boiler once; if the code returns, call an installer.
Clear the code and test
- Fix what the checks above found first — pressure topped up, a radiator bled, the thermostat set right. Resetting without fixing the cause only brings the code back.
- Make sure the boiler has power and the gas tap at the boiler is open.
- If the water pressure is below 1.5 bar, top it up to between 1.5 and 2 bar with the filling loop, as your manual shows.
- Press the reset button once and watch a full cycle: the boiler should start, heat the radiators or the tap water, and keep running without the code coming back.
When to call a professional
Most cases are solved by the checks above. Book a technician if any of these apply:
- The code comes back after you have run the checks and a test cycle.
- You smell burning, see sparks or scorch marks, or the breaker trips.
- Water is leaking and you cannot stop it.
- The fix needs panels opened beyond what your manual describes, or a part tested with a meter, and you are not set up for that.
When you call, give the brand, the code F005, your model number (on a label on the type plate, usually at the bottom or on the side of the boiler) and the checks you already ran. It shortens the visit.
Parts that may be involved
Gas valveIgnition/ionisation electrode
Parts are model-specific. Find your model number first — usually on a label on the type plate, usually at the bottom or on the side of the boiler — and match the part to that number before ordering.
Questions people ask about F005
What does F005 mean on a Intergas boiler?
F005 means: Flame failure during operation: the flame drops out or the flame signal is too weak. With F005 the flame drops out while burning. A well-known cause is recirculation: flue gases come back into the boiler, for example because of a blocked flue outlet. Check the outlet outside and reset once; after that, adjustment and checking is a job for an installer.
Can I fix Intergas F005 myself?
Start yourself: the checks on this page cover the causes you can reach without opening the machine up. If they point to a faulty part, testing or replacing it is usually a technician job.
How do I clear Intergas F005?
Fix what the checks above found first — pressure topped up, a radiator bled, the thermostat set right. Resetting without fixing the cause only brings the code back. Make sure the boiler has power and the gas tap at the boiler is open. If the water pressure is below 1.5 bar, top it up to between 1.5 and 2 bar with the filling loop, as your manual shows.
Sources checked
- Intergas HRE Parameter List / Fault Finding (manufacturer document)
- Warmgarant: Intergas storingscodes
The meaning and checks for this code were checked against the sources above in November 2026. Codes vary by model and region; if your manual lists a different meaning for your exact model, follow the manual.