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If your outside temperature is not showing on your clock, that may mean that the clock and the transmitter have lost their connection. To reconnect them you must first take the batteries out of both of the units for 15 minutes. First put the batteries back into the transmitter, and then the clock. Let them sit side by side inside your home. When both the indoor and outdoor temperatures show on your clock with the same reading, or within two degrees of each other, then you may put your transmitter back outside. Remember to keep the transmitter out of the direct sun in a dry place. Also keep it away from metal, which can affect the readings.
Can't see much in the photo, but in general, push the "SET" button repeatedly to scroll though all the settings. Temperature UP and DOWN arrows change the settings when the display is flashing. Press "RUN" to lock it all in. Hope this helps.
I had one of these a while back and it had a required sequence for putting in the batteries. When the signal dies and you have to replace the transmitter batteries and the clock batteries in a certain sequence. The transmitter batteries cannot just be replaced. You also had to remove the clock batteries, then put in the transmitter batteries, then replace the clock batteries.
Could be a defective temperature probe. Test the probe by removing the wires. Take a VOM set for ohms. read the violet color wires for plus or minus 5% of 1100 ohms. If it reads OK at this resistance change out the ERC (clock). If it reads outside this resistance, change the temperature probe.
Without having parts to try, this would be difficult to know what the fault is. Inside this unit there is a circuit board, and on the outside there is the exernal temperature sensor.
There are only a few things that can go wrong. There is not much that is servicable unless you can find a spare board, or a spare temperture probe. There is very little posiblity that in any practicality this unit can be serviced at the component level.