Intergas Boiler Error Code F004
F004 means the boiler wants to start but no flame is produced. Check the gas supply first and reset once. If the code stays, an installer must check the ignition, the gas valve and the condensate drain.
Applies to: Intergas Xtreme
Common causes
- Gas tap closed, or gas inlet pressure too low (below 20 mbar) or dropping out
- Blocked condensate drain
- Ignition unit or gas valve has no power or is faulty
- Poor internal earthing
What to check, in order
- Check that the gas tap under the boiler and at the gas meter is open, and that the gas cooker works.
- Reset the boiler once and listen whether it starts again.
- If it does not start, call a certified installer to check the ignition, the gas valve and the condensate drain.
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 F004, 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
Ignition unitGas valve
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 F004
What does F004 mean on a Intergas boiler?
F004 means: No flame during start-up. F004 means the boiler wants to start but no flame is produced. Check the gas supply first and reset once. If the code stays, an installer must check the ignition, the gas valve and the condensate drain.
Can I fix Intergas F004 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 F004?
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.