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Er1

Braun Thermometer

Severity: Minor

Source: OnlyErrorCodes.com — Every error code. One place.

Braun ThermoScan Er1 Error — Fix Guide

What it means

Er1 means the ThermoScan's probe tip is too warm — above 40.5°C (104.9°F) — to take an accurate reading.
This happens when the thermometer has been used repeatedly in quick succession or has been stored in a warm place.
Rest the thermometer with the probe exposed to room air for 1 minute before retaking the measurement.

Affected Models

  • Braun ThermoScan 5 IRT6500
  • Braun ThermoScan 6 IRT6515
  • Braun ThermoScan 7 IRT6520
  • Braun ThermoScan 7 IRT6525
  • Braun No Touch + Forehead

How to Fix It

  1. Remove the lens filter and rest the thermometer

    Remove the plastic lens filter from the probe tip.
    Hold the thermometer with the probe tip pointing upward in open room air (18–25°C).
    Wait 60 seconds.
    The probe cools down quickly when exposed to ambient air.

  2. Do not store the thermometer in a warm location

    Storing the Braun ThermoScan in a bathroom cabinet, near a radiator, or in a closed case that traps heat can warm the probe before use.
    Store the thermometer in a cool, dry drawer at room temperature.

  3. Fit a fresh lens filter before retaking the reading

    Always use a new lens filter for each measurement.
    Fit a fresh filter, ensure it clicks firmly onto the probe, and take the reading.
    A missing or incorrectly fitted filter also causes measurement errors.

  4. Take the reading without repeat measurements

    Avoid taking multiple readings back-to-back within a short period.
    Each measurement warms the probe slightly.
    If a second reading is needed, wait at least 1 minute between measurements.

Frequently Asked Questions

Does Er1 mean the thermometer is broken?

No.
Er1 is a temporary condition caused by probe temperature, not a hardware fault.
Once the probe cools to room temperature, the thermometer operates normally.

Why does my Braun show Er1 every first measurement of the day?

If the thermometer is stored somewhere warmer than 40°C — inside a case left in a hot car, near heating, or in a warm bathroom — the probe will be above the threshold before you even use it.
Move the storage location to a cooler spot and the issue will stop.