If you have lost the outside temperature on the clock display then do the following:-
1. Make sure you have good batteries installed in the remote transmitter
2. Remove the batteries from the main clock and keep them out until the clock display disappears.
3. Re-install the batteries in the clock.
4. Wait until the display returns and includes the outside temperature display as well.
5. Set the clock again for current time/date etc.
Also check the link bellow:-
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Setting the clock
Use these instructions to set the clock.
1 Use MULTI-CONTROL to select
2 Press MULTI-CONTROL to display the
• Press BACK to return to the previous display.
3 Press MULTI-CONTROL to select the segment
of the clock display you wish to set.
Each time you press MULTI-CONTROL, one
segment of the clock display is selected.
As you select segments of the clock display,
the selected segment blinks.
4 Turn MULTI-CONTROL to put a clock
• You can also perform the same operations by
pushing MULTI-CONTROL up or down.~
This is from the manual
Usually answered in minutes!