Applies to: Oracle Touch.
How to fix ER21
- Tank full and seated, then power cycle and let the machine attempt a fill.
- Descale as the manual describes, including the steam boiler cycle if your model has one. Technician sources say scale on a level probe can read as "no water".
- Some service menus show a live boiler level reading while the pump runs. A technician would use it to see whether the probes register water.
- Cleaning the probes, replacing their o-rings and checking the inlet hose means opening the machine and working near mains voltage, so it is technician work.
- If the fill pump buzzes and no water reaches the boiler, a technician would check the pump.
When to stop and call a repairer
Water and mains electricity share the top of the boiler. Do not open the machine or touch the probes.
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 part or repair costs. Ask for a quote. |
How to check the error log
Switch the machine off at the wall. Hold the front Power button, switch the wall power back on and release when the logo appears. Enter the service password 00000, then open Error Counter (stored faults) or Live Debug (live temperatures and water levels). One technician video says the entry method differs between machines built before and after 2018, so if this does not work, do not keep trying.
Clear the log after a repair so you can tell whether the fault has really gone.
Beyond the fix
Tips and tricks
- Probe faults often follow a descale, because conductive descaler residue around a probe can fool the electronics.technician video
- A video suggests that rinsing the boiler with clean water after a descale can sometimes clear residue; leave opening the lid to a qualified technician.technician video
- Probe seals age; one repairer advises replacing probes and O-rings about every two years as prevention.technician video
Common mistakes
- Using a stronger or home-made descaler than Breville's; the repairer found Breville's own solution safer than pure citric acid.
- Ignoring small steam leaks near the top of the machine.
Easily confused with
- ER24 is listed on our page as a coffee boiler level probe fault, but the sources we read describe probes only in the steam boiler, so the two are not firmly separable.
Further reading
Questions
What does ER21 mean on the Breville / Sage Oracle Touch?
Steam boiler high level probe fault detected. The boiler water-level probe is not reporting what the controller expects: the boiler should be filling and the level probes should register water, and they do not. Scaled probes, a blocked inlet line, a fill pump that has stopped moving water, or a probe seal leak are the causes technician sources describe. Breville does not publish this code table, so the meaning comes from third-party service tables.
Can I fix ER21 myself?
DIY difficulty: hard. Tank full and seated, then power cycle and let the machine attempt a fill. Descale as the manual describes, including the steam boiler cycle if your model has one. Technician sources say scale on a level probe can read as "no water".
How much does it cost to fix ER21?
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 part or repair costs. Ask for a quote.
ER21 during startup or during use?
Breville / Sage Oracle Touchs report ER21 any time. There is no reliable pattern to when it appears — treat any occurrence as real.
Can I keep using the machine with ER21 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 ER21 clear on its own?
Rarely. A reset or power cycle is worth one try, but ER21 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.