Intergas Boiler Error Code F001
With F001 the boiler gets too hot while heating. Usually the heat cannot escape because of air in the system, low water pressure or a pump that is not running. Bleeding, topping up and resetting often helps; otherwise an installer must check the pump and the sensors.
Applies to: Intergas Xtreme
Common causes
- Air in the system, so the water does not circulate properly
- Circulation pump not running or faulty
- Fault or incorrect fitting of flow sensor S1 or hot water sensor S3
What to check, in order
- Open the radiator valves, bleed the system and check the water pressure; top up to 1.5 to 2 bar if needed.
- Reset the boiler once and check whether it starts normally again.
- If the code returns, call an installer to check the pump and the sensors.
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 F001, 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
Circulation pumpFlow sensor S1
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 F001
What does F001 mean on a Intergas boiler?
F001 means: Temperature too high during central heating operation. With F001 the boiler gets too hot while heating. Usually the heat cannot escape because of air in the system, low water pressure or a pump that is not running. Bleeding, topping up and resetting often helps; otherwise an installer must check the pump and the sensors.
Can I fix Intergas F001 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 F001?
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.