My acurite model 01046/02081 reads the outside temperature higher then it is and the forcast is off on it. It has new batteries and is placed less then 300 feet from station outside

My National Geographic Weather Station is the opposite. The outside sensor only indicates the temperature, but the single CR2023 battery lasts a year. The inside unit on my desk lasts around 5 - 6 months and lets me know if needs a battery by showing the outside temperature as ' -- '

Although the manual says 'rechargeable batteries are not recommended', I would try 4 Sanyo Eneloop batteries. Or you could contact Acurite Support and ask them if your battery use is excessive?

01602BPDI - Professional Weather Station Instructions

AcuRite.com https://www.acurite.com > 01602-instructions

Professional Weather Center model 01602BPDI. Questions? Contact Customer Support at. (877) 221-1252 or visit www.AcuRite.com. SAVE THIS MANUAL FOR FUTURE ...

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.

take it back as it is not fit for the purpose
have it checked under warranty

Typically the Sensors Sync-Up within 10 to 20 Minutes. However, placement of the Outdoor Sensor is also important. The National Weather Service (NWS) and NOAA measure the Temperature in the Shade, and NOT in the Sun. So be sure that your "Exterior Sensor" is placed in the Shade, under an overhang for example. However, be careful not to place the sensor under an overhang, where there may be a soffit-vent or gable-vent, that is used to vent out warm air from the attic. Even a three (3) season, unheated porch can be warmer than the actual external temperature, due to passive/solar heat captured thru the windows (East/South/West).

Here's the manual for the AcuRite Weather Forecaster. If it's not showing the outside temperature, make sure the A-B-C switch is set to match the display unit. Not doing so might be the reason it's not synchronizing and displaying the outdoor temperature. https://www.acurite.com/media/manuals/75077-75107-instructions.pdf

We would recommend a reset of your unit. Please verify that you are using good-quality, standard alkaline batteries such as Energizer or Rayovac, then follow the steps below.
1. Bring both the sensor and display unit indoors and remove at least one battery from each.
2. Make sure the A-B-C switch on both units match. Sometimes changing to a different channel can help.
3. Reinstall the battery in the outdoor sensor.
4. Reinstall the battery in the display unit.
5. Let the units sit within a couple feet of each other for about 20 minutes to gain a strong connection.
If you need any further assistance, please contact AcuRite Customer Support at 1-877-221-1252 or [email protected].

Have you changed the batteries on the outside sender unit?

http://www.acurite.com/advancedsearch/result/?q=1099RX

There is no reset button, installing new batteries causes the sensor to reset itself.

Try removing and re-installing the batteries.

Good luck,
Steve

Sometimes the RF frequency from the outside transmitter loses contact with the clock's frequency ( it has happened to me only twice in 6 years ), and then the outside temp will not show. Simple solution to fix this is: Take down the outside transmitter and the internally mounted clock. Remove batteries from both. Wait about 10 mts. First install batteries in the transmitter, then after about 30 seconds, install batteries in the clock. In about 5 mts, you will find the clock showing the external temp like before.