Model: Levo Digital Clocks and Timers
13:15 is a Primex code that represents the number of digits and clock's firmware version. The cause of this issue is due the clock is not seeing a signal from a Transmitter.
Check the status of the Transmitter(s) to be sure they have the correct information on its display and red LED is not flashing. Once the Transmitter is broadcasting, clocks will correct at their next scheduled update.
Does Transmitter have an External Antenna? During troubleshooting, you can power-cycle a Transmitter with an External Antenna to allow it to broadcast continuously for 8 hours.
Reset the clock. A reset causes the clock to scan for a broadcasting Transmitter frequency.
From its setting panel, press and release the Reset button -
There is also a potential the clock is experiencing interference and not allowing the clock to receive a broadcasting signal. Move the clock to an area where other clocks are set to the correct time. This task should isolate the issue to either a defective clock or signal issue.
When certain types of electronic light ballasts become defective they may radiate broadband noise, which can interfere with wireless devices. While interference issues are unlikely with the Primex system, high levels of noise present in the 72-76MHz range could potentially cause clocks which are located far from the Transmitter and also within the close proximity of these ballasts to not receive a signal. Very limited instances have occurred in the past, which has only been found to happen when ballasts become defective.
If the issue cannot be resolved, additional troubleshooting is required.