When taking temperature, it now beeps a lot then simply say LO. have tried changing the batteries it makes no difference.
This reading also happens if the temperature probe wires are not making good contact with the circuit board trying to read the probe. If you can't open up to fix it by resoldering the faulty wires, then its replacement time.
How do you open it? Is there a trick?
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Have you tried replacing the disposable-lens filter ?
The manual is available at: http://brauntherms.com/downloads/IRT4020_4520_MNLA_U.0035_OM_25JAN11.pdf
LO means temperature is too low, less than 93.2F or 34C. Most common solution is to use a new, clean Lens Filter. We have always had to replace these regularly.
Care and cleaning The probe tip is the most delicate part of the thermometer. It has to be clean and intact to ensure accurate readings. If the thermometer is ever accidentally used without a lens filter, clean the probe tip as follows: Very gently wipe the surface with a cotton swab or soft cloth moistened with alcohol. After the alcohol has completely dried out, you can put a new lens filter on and measure. If the probe tip is damaged, please contact your authorized local service centre. Use a soft, dry cloth to clean the thermometer display and exterior. Do not use abrasive cleaners. Never submerge this thermometer in water or any other liquid. Store thermometer and lens filters in a dry location free from dust and contamination and away from direct sunlight. Additional lens filters (LF 40) are available at most stores carrying Braun ThermoScan.
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