Trouble-shooting
Error message | Situation | Solution |
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| No lens filter is attached. | Attach new, clean lens filter. |
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| The thermometer cannot identify | IRT 4020: Clear the display by |
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| a secure position of the probe. | pushing the «start» button once. |
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| An accurate measurement was | IRT 4520: Clear the display by |
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| not possible. | pushing the «I/O» button once. |
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| POS = position error | Take care that the positioning of |
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| the probe is correct and remains | |
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| stable. |
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| Ambient temperature is not within | Allow the thermometer to remain |
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| the allowed operating range | in a room for 30 minutes where |
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| (10 – 40 °C or 50 – 104 °F). | the temperature is between |
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| 10 and 40 °C or 50 and 104 °F. |
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| Temperature taken is not within | Make sure a new, clean lens filter |
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| typical human temperature range | is attached and thermometer is |
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| (34 – 42.2 °C or | properly inserted. Then, take a |
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| HI = too high | new temperature. |
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LO = too low
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| System error – | Wait 1 minute until the thermo- |
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| flashes continuously and will not | meter turns off automatically, then |
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| be followed by the ready beep | turn on again. |
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| and the ready symbol. |
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| If error persists, | ... reset the thermometer by re- |
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| moving the batteries and putting |
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| them back in. |
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| If error still persists, | … have the thermometer checked |
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| at a Braun Customer Service |
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| Center. |
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