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The indoor temperature and humidity and outdoor temperature readings can be calibrated on the display to improve accuracy. Calibration can improve accuracy when sensor placement or environmental factors impact your data accuracy. 1. To access calibration mode, press AND HOLD the "?", "?", and "SET" buttons for at least 5 seconds. 2. Once in calibration mode, the preference you are currently setting will be highlighted on the display. 3. Press the "?" or "?" buttons to calibrate the data value higher or lower from the actual reading. 4. Press the "SET" button to confirm the calibration adjustment. The " " icon will remain illuminated next to calibrated values. 5. The next adjustable data will begin flashing, indicating it is ready to be calibrated. Repeat Steps 1 - 4 to calibrate additional data. The preference set order is as follows: OUTDOOR TEMPERATURE INDOOR TEMPERATURE INDOOR HUMIDITY BAROMETRIC PRESSURE (must be set to MANUAL mode; see page 12) After 20 seconds of inactivity, the display will save the adjustments and exit calibration mode. Note: Calibrations will be erased if the display is reset or if batteries are removed and the power adapter is unplugged.
You have to remove all batteries, both outdoor and indoor. Install replacement batteries in the outdoor unit. Back indoors, install replacement batteries in the indoor unit and wait for temperature to be displayed. If nothing happens, the outdoor unit may have failed.
You may have to "reset" it by removing both indoor and outdoor unit batteries, waiting briefly, then reinstalling batteries in the outdoor unit followed by the indoor unit. After awhile, the outdoor unit should begin sending information to the indoor unit.
According to instructions for similar systems, you have to replace batteries in the outdoor unit first, then the indoor unit and wait 10 minutes without pressing any buttons for the indoor unit to begin displaying the outdoor temperature.
I have a BIOS wireless indoor/outdoor thermometer. The indoor base unit doesn't display the outdoor temperature - it is blank - however the other temperatures - humidity, indoor temp, etc., are displayed, What is the problem? We have misplaced the manual so we don't know what to do.