Error Message "5603" On Horizon T101 Upon Startup

Suddenly, the LED console readouts on my Horizon T101 Treadmill don't display,
and the treadmill won't respond to any selections made, though selections do
"beep" when pushed.

A Code 5603 flashes on the LED Time readout display, and SELECT on the main
display at startup, but there's no display on the Select Workout or Start screens.

There's no explanation of error codes in my T101 manuals.

I lubricated the T101 in September, and it was running fine up until this AM.


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