If you’re having issues getting a temperature reading, you may need to do a simple thermometer reset. To reset your thermometer, first, remove all batteries from the device (both from the sensor and the display screen). After all the batteries are removed, first re-insert the display screen batteries. Then, you can reinsert the sensor batteries. This order of battery insertion will reset your thermometer.
Keep in mind, that it can take some time for your unit to fully heat up (sometimes 2-3 hours or more depending on the room, temperature, and size of treatment load). Also, note that the display screen may lose signal if it is too far away from the unit, or if the unit heats above 140°F. If this happens, simply follow the reset instructions above.