Anova Sous Vide E03 Error — Temperature Sensor Fault

What Does This Error Mean?

E03 means the temperature sensor is reading data the controller can't trust — either it's broken, shorted, or reading impossibly high or low.
The unit refuses to heat without a working sensor.
Check for mineral buildup on the bottom of the Anova (descale if heavy).
If E03 persists after descaling, contact Anova support — sensor repair isn't user-fixable.

Affected Models

Anova Precision Cooker
Anova Precision Cooker Pro
Anova Nano
Anova Precision Cooker 2.0

Common Causes

Temperature sensor failed (open or shorted)
Heavy mineral buildup insulating the sensor
Sensor wire broken inside the unit
Controller sensor input damaged
Recent power surge damaged sensor circuit

How to Fix It

Power off and remove from water.

Press the power button.
Unplug from the outlet.
Carefully lift the Anova out of the water bath.
Be gentle — heating element area can be hot.
Set on a towel to drip dry.
Inspect the heating element area.

Look at the bottom of the Anova where the heating element is.
Heavy white scale (calcium deposits from hard water) insulates the temperature sensor.
If you see thick deposits, that's your likely E03 cause.
Light scale doesn't typically cause issues.
Descale the Anova.

Fill a container with 50/50 white vinegar and water.
Set the Anova to 60°C (140°F) and run for 30 minutes.
The vinegar dissolves mineral deposits.
Rinse thoroughly with fresh water afterward.
Repeat if heavily scaled.
Test with fresh water.

After descaling, fill a fresh container with cool water.
Power on.
Set to 60°C and start.
Watch the temperature display.
If it climbs smoothly to 60°C and stops, the sensor is working again.
If E03 returns, the sensor is genuinely failed.
Contact Anova support.

If descaling doesn't fix E03, contact support at support.anovaculinary.com.
Provide model and serial number.
Under warranty: replacement typical.
Out of warranty: repair is rarely cost-effective on these consumer-priced devices.
Most users replace at 150-250 USD.

Frequently Asked Questions

How often should I descale?

Every 2-3 months for typical use in hard water areas.
Annually in soft water areas.
If you can see white scale building up on the heater area, descale.
Regular descaling extends the life of your Anova significantly.

Can I use my Anova while waiting for replacement?

No — without a working temperature sensor, sous vide cooking isn't safe.
Food may be undercooked or overcooked.
Use a stovetop pot with a separate thermometer as a workaround, or use a different cooking method until the Anova is replaced or repaired.