Breville / Sage Dual Boiler 00: temperature sensor open circuit (not detected)
00 means: Steam boiler temperature sensor not detected.
How to fix 00
- Switch the machine off at the wall, wait 60 seconds and switch it back on. A one-off reading glitch clears; a real open circuit comes straight back.
- Remove the water tank, hopper and drip tray, then the base or rear panel (Phillips screws). Find the sensor plug for the steam boiler temperature sensor (NTC) on the control board, unplug it, look for green corrosion or heat marks, and push it firmly back on.
- Check for water where it should not be. Moisture on the board or in a connector reads as an open or short. Dry everything and look for the leak that caused it (usually a boiler o-ring or hose clip).
- If the code returns, replace the steam boiler temperature sensor (NTC). On the Dual Boiler it is a plug-in part; note which way the wires route before pulling the old one.
- Clear the stored error afterwards (see how to read the error log below) so you can tell whether it recurs.
When to stop and call a repairer
Stop and book service if you find a swollen or burnt component on the board, or if the sensor plugs are fine and a new sensor does not clear the code: that points at the control board.
What it costs
Parts: Genuine NTC sensor assemblies run about $25 to $95 depending on which sensor it is (steam wand and milk-jug sensors are the dear ones). O-ring kits are $10 to $20.
Service: Out-of-warranty Breville service quotes for internal faults are commonly $300 to $500, sometimes more, plus shipping. Independent espresso repair shops are usually cheaper for a sensor swap.
Worth repairing? Usually yes. A sensor plus o-rings is under $100 and 30 to 60 minutes. Only a dead control board makes the repair questionable on an older machine.
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. Press MENU to reach item 3 (error log) and item 4 (boiler level status such as LLL / HHH). In the error log, MENU steps through codes 00 to 12 with a count for each. At "ErSt", hold MANUAL until it beeps to clear the codes (the cup counter is not reset).
Clear the log after a repair so you can tell whether the fault has really gone.
Related codes on the same part
- 01 — Steam boiler temperature sensor short circuit
FAQ
What does 00 mean on the Breville / Sage Dual Boiler?
Steam boiler temperature sensor not detected. The control board cannot read the steam boiler temperature sensor (NTC). On this code the sensor reads as an open circuit: the wire has come off, the plug is loose or corroded, or the sensor itself has failed. Because it dropped out mid-cycle, a loose or heat-damaged connection is the most likely cause.
Can I fix 00 myself?
DIY difficulty: moderate. Switch the machine off at the wall, wait 60 seconds and switch it back on. A one-off reading glitch clears; a real open circuit comes straight back. Remove the water tank, hopper and drip tray, then the base or rear panel (Phillips screws). Find the sensor plug for the steam boiler temperature sensor (NTC) on the control board, unplug it, look for green corrosion or heat marks, and push it firmly back on.
How much does it cost to fix 00?
Genuine NTC sensor assemblies run about $25 to $95 depending on which sensor it is (steam wand and milk-jug sensors are the dear ones). O-ring kits are $10 to $20. Out-of-warranty Breville service quotes for internal faults are commonly $300 to $500, sometimes more, plus shipping. Independent espresso repair shops are usually cheaper for a sensor swap.
Is it worth repairing?
Usually yes. A sensor plus o-rings is under $100 and 30 to 60 minutes. Only a dead control board makes the repair questionable on an older machine.
Code meanings are compiled from manufacturer service references and repair documentation for the BES920; fixes follow documented repairs and owner reports. Model revisions can differ. If your appliance is under warranty, contact the manufacturer before opening it.