Can't find a owners manual for EnviraStation weather station DWS 220

hello
u'd need a proper manual for this in my opinion
like there are plenty of dealers and online shops that deal in those..
you can get some free at reliable-store and it;s actually really illustrative

This is for a DWS-150B it may be similar or at least give you an idea
DWS 150 IB Weather Watcher

Usually it is due to bad batteries or remote is too far away from home unit. Put units next to each other and press the channel button on front of the home unit. It will start a search to find the remote. If it finds it with a temp reading press the channel button again and you should hear a beep. Channel is locked in. If you still do not get a temp reading try changing batteries in both units and try again. Another try is to unplug the home unit and wait several minutes with no batteries in either house unit or remote. Replace batteries in remote then in house unit and plug back into power. Set all settings and see if you get the reading. If not try step one again. Weak batteries will do the same thing as well as remote to far away from unit.

http://www.manualnguide.com/shared/dws-150-ibweatherwatcher/11/

Is the outside unit LED on? I replaced the battery on the outside unit and in doing this reset the outside information.

the above response is wrong. that is not the manual for envirastation dws-130

You must remove the batteries in the base unit, replace them, and it should work properly. You can press the Tx button on the back of the remote unit to verify the RF reception. To ensure it is working properly, place both units next to each other indoors and make sure they read the same temperature.
The manual can be found here. Refer to page 3 for more information.

After inserting the batteries, DO NOT set the time until the OUTSIDE temperature registers. That's the trick.

I keep the outside unit of our in/out set under a coffee can shaded under a bench; one could argue the aesthetics but shielding it from wind and sun is mandatory otherwise one can get record temps pretty often.
The outside units generally transmit to the receivers only every few minutes to keep battery consumption down so moving them won't necessary gie you an immediate change.