Er4
Braun Thermometer
Severity: MinorWhat Does This Error Mean?
Er4 means the battery voltage has dropped below the minimum level required to power the infrared sensor accurately. The battery icon may have been showing low for some time. Replace the battery with a fresh 1.5V AA alkaline battery to restore normal operation.
Affected Models
- Braun ThermoScan 5 IRT6500
- Braun ThermoScan 6 IRT6515
- Braun ThermoScan 7 IRT6520
- Braun ThermoScan 7 IRT6525
How to Fix It
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Locate the battery compartment
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Remove the old battery
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Insert a fresh 1.5V AA alkaline battery
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Close the compartment and test
Frequently Asked Questions
How long do Braun ThermoScan batteries last?
A standard alkaline AA battery lasts approximately 1,000–3,000 measurements depending on the model. If you use the thermometer regularly during illness seasons, expect to replace the battery every 6–12 months.
Can I use rechargeable batteries in my Braun ThermoScan?
Braun recommends against rechargeable NiMH batteries. Their 1.2V output is lower than the 1.5V alkaline standard, which can cause the thermometer to report Er4 prematurely or give inaccurate readings. Use standard alkaline AA batteries only.