I have a 00594 weather station. I changed the batteries in the main unit and it won't pick up the radio signal. I Hvae done this before with no problem.

just in case ,if you interested with more info about
Careful Weather Station Set Up is the Key to Rewarding Weather Observation here
are some thoughts and recommendations.

Because getting the most out of your weather station depends on three very
important factors, all linked to each other.

Firstly, the outside weather sensors must be set up to get the most accurate and
reliable weather information possible from your yard or home.

Secondly, the weather sensors and receivers must be able to communicate with
each other with as little interference as possible.

And finally, the receiver with its display unit must be in a convenient
position for you to access it and use it. You may need to give some thought to
linking it with a computer or other equipment as well.

Location of the Receiver/Display Console
The best place to set up your sensors is in an accessible place in your yard or
garden.

So take a good look around. You will need to find a clear location for the
sensors, preferably out of the way ofeveryday attractions like basketball
rings, barbecues or swimming pools. It should have a clear line of sight to a
room where you can install the receiver. The receiver's location should also be
out of the way of normal home activities. And I'm not ignoring the possibility
that some members of your household may not view the weather station with as
much enthusiasm as you do.
The best choice may be your office or study, or the room where your computer
already is. If this is handy to an appropriate location for your outside
weather sensors, then you're in great shape. But don't do anything just yet.

If the layout of your house and yard is not quite so helpful, it is probably
best to tackle the problem from the other direction and consider sensor
locations.

But before we step outside, here's a quick tip on the positioning of the
receiver. Because radio signals are reduced by walls, cladding, even UV coating
on windows, the best position for your receiver is near the outside wall of the
house. Most receivers have optional wall or desk mounting, giving you quite a
lot of flexibility

The Ideal Places for Weather Sensors
Your first thoughts should be about distance between sensors and the receiver.
Transmitting range varies from 80 feet (24 metres) for many temperature
sensors, to 300 feet (about 90m) or even 1000 feet (300m) for Davis home
weather stations. Each wall the signal needs to pass through will cut the range
by 20-30 feet, and trees can also reduce signal range. Normally the longer
range transmitters will perform well in most home situations, but be aware of
the limitations on the short range units.

The ideal requirements for temperature and humidity sensors are different from
those recording wind and rainfall, so some juggling of the final position may
be required. Most home weather stations will give you quite a bit of room to
move here, with each sensor having its own transmitter, or through cabling from
wind and rainfall sensors to a single transmitter in the temperature/humidity
unit.

The main consideration here is that temperature recorders must be sheltered or
shielded from direct or strongly reflected sunlight, which will heat them up and
result in inaccurate readings, 20°F or more too high, or maybe even damage
them. Conversely, wind and rainfall recorders should be located where wind and
rain are not affected by sheltering trees or buildings.

And finally, the lip of the rain gauge should be the highest point in the
immediate vicinity - slightly above the top of a wall or post rather than a
little way down.

While some compromise may be necessary, with a bit of thought you should be able
to find a good location for all the equipment.
My regards..