Breville / Sage Barista Touch Impress ER01: temperature sensor open circuit (not detected)
ER01 means: Ferro heater temperature sensor open circuit detected at startup.
How to fix ER01
- 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 ThermoJet (ferro) heater 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 ThermoJet (ferro) heater temperature sensor (NTC). On the Barista Touch Impress 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
Unplug the machine. Press and hold the Power button while plugging it back in. When the password screen appears, enter 02015 to open Service Mode, then open the error log.
Clear the log after a repair so you can tell whether the fault has really gone.
Related codes on the same part
- ER02 — Ferro heater temperature sensor open circuit detected during operation
- ER03 — Ferro heater temperature sensor short circuit detected at startup
- ER04 — Ferro heater temperature sensor short circuit detected during operation
Same fault on other Breville / Sage machines
FAQ
What does ER01 mean on the Breville / Sage Barista Touch Impress?
Ferro heater temperature sensor open circuit detected at startup. The control board cannot read the ThermoJet (ferro) heater 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 fails the self-test at power-on, the machine refuses to start until the sensor reads again.
Can I fix ER01 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 ThermoJet (ferro) heater 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 ER01?
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 BES881; fixes follow documented repairs and owner reports. Model revisions can differ. If your appliance is under warranty, contact the manufacturer before opening it.