Applies to: Dual Boiler.
How to fix 01
- Switch off at the wall and unplug. Leave the machine for an hour so any moisture dries, then try again. A short that clears after drying suggests a leak to find.
- Inspecting the steam boiler temperature sensor (NTC) plug and the wiring near the boiler means opening the machine, which is technician work. A technician would look for a wet patch, white scale trails or a perished o-ring around the probe.
- A technician would replace any leaking o-rings at the boiler fittings and sensor probes; the leak, not the sensor, may be the true fault.
- If the code persists after everything is dry, the steam boiler temperature sensor (NTC) needs replacing by a technician.
- Afterwards, clear the error log and run a full heat-up and a shot to confirm.
When to stop and call a repairer
If you see scorch marks, smell burning, or the machine trips your GFCI / RCD, stop: that is an electrical fault, not just a sensor.
What it costs
| Parts | Not published by Breville. Ask an authorised service centre for a quote. |
|---|---|
| Service | Not published by Breville. Ask an authorised service centre for a quote. |
| Worth repairing? | Often yes, but Breville does not publish repair costs. If a leak has soaked the control board, get a quote before spending anything. |
How to check the error log
Switch the machine off at the wall. Hold EXIT and MANUAL while switching the power back on to enter the self-check menu. Technician videos say it shows boiler level status (such as LLL for low and HHH for high) and temperatures in the order coffee boiler, steam boiler, group head. The same videos say the stored error codes (00 to 12, with a count for each) sit in a separate engineer menu, opened by holding 1 CUP and 2 CUP and pressing the power button. Breville does not document either menu, so treat these steps as unconfirmed.
Clear the log after a repair so you can tell whether the fault has really gone.
Beyond the fix
Tips and tricks
- In the hidden self-check menu, compare the three temperature screens. A reading near room temperature, or far from the other two, points at a sensor or connector before any parts are bought.technician video
- Look for steam or wetness around the machine's inside during use, and for a lid that stays warm when switched off. Leaks above the control board are a known cause of odd sensor and heater faults; a technician fixes these.technician video
- Do not open the machine yourself to chase this. Mains voltage stays live inside even when switched off at the front, so book a qualified technician to test the sensor and its connector.technician video
Common mistakes
- Replacing the boiler or element first, when a sensor or connector on the temperature circuit is the cheaper thing to test.
- Skipping the self-check temperature readout, which separates the three heating circuits.
Easily confused with
- A steam boiler stuck at a low reading with three beeps and no code on screen is often a steam fill or descale problem, not a sensor fault; the boiler never heats.
Further reading
Questions
What does 01 mean on the Breville / Sage Dual Boiler?
Steam boiler temperature sensor short circuit. The steam boiler temperature sensor (NTC) is reading as a short circuit: the board sees near-zero resistance, which a healthy sensor does not produce. Technician sources name water bridging the sensor contacts (a leak or steam at the probe seal) and a failed sensor as the likely causes. Because it failed at startup, a wet connector or a sensor that has already failed is plausible. Breville does not publish this code table, so the meaning comes from third-party service tables.
Can I fix 01 myself?
DIY difficulty: hard. Switch off at the wall and unplug. Leave the machine for an hour so any moisture dries, then try again. A short that clears after drying suggests a leak to find. Inspecting the steam boiler temperature sensor (NTC) plug and the wiring near the boiler means opening the machine, which is technician work. A technician would look for a wet patch, white scale trails or a perished o-ring around the probe.
How much does it cost to fix 01?
Not published by Breville. Ask an authorised service centre for a quote. Not published by Breville. Ask an authorised service centre for a quote.
Is it worth repairing?
Often yes, but Breville does not publish repair costs. If a leak has soaked the control board, get a quote before spending anything.
01 during startup or during use?
Breville / Sage Dual Boilers report 01 any time. There is no reliable pattern to when it appears — treat any occurrence as real.
Can I keep using the machine with 01 showing?
Usually you can finish the drink you are making, but do not ignore it — the underlying fault rarely heals itself. Work through the cheap checks first.
Will 01 clear on its own?
Rarely. A reset or power cycle is worth one try, but 01 with a "hard" difficulty rating almost always means a failed component that has to be replaced.
How long does the repair take?
This one is a bench repair for most owners — the teardown, test and reassembly are the bulk of the work, not the part itself.