Intergas Boiler Error Code 4
Code 4 means no flame is seen at start-up. Often the gas supply is the problem, for example a closed gas tap. Check the gas supply and reset once; if that does not help, an installer must check the ignition, the gas valve and the earthing.
Also shown as: 04
Applies to: Intergas HRE and Kombi Kompakt
Common causes
- Gas tap at the boiler or at the gas meter closed, or no gas supply
- Gas inlet pressure too low (below about 20 mbar)
- Ignition unit, ignition/ionisation electrode or gas valve faulty
- Poor earthing of the ionisation electrode or the boiler
What to check, in order
- Check that the gas tap under the boiler and at the gas meter is open, and that another gas appliance, such as the cooker, works.
- Check that the boiler is plugged into an earthed socket.
- Reset the boiler once and listen whether it tries to start again.
- If the boiler does not start or cuts out again, call a certified 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 4, 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 unitIgnition/ionisation electrodeGas 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 4
What does 4 mean on a Intergas boiler?
4 means: No flame signal: the burner does not ignite or the flame is not detected. Code 4 means no flame is seen at start-up. Often the gas supply is the problem, for example a closed gas tap. Check the gas supply and reset once; if that does not help, an installer must check the ignition, the gas valve and the earthing.
Can I fix Intergas 4 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 4?
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.