According to the Johnson manual: "If the temperature reaches the cut-in value during the delay period, the display flashes between the sensed temperature and ASd, indicating that the next On-cycle is being delayed. After the set delay time has elapsed, the A419 control returns to normal operation, restarts the equipment (if cut-in has been reached), ASd stops flashing, and the LCD reverts to the normal operating display."
So it seems likely the ASD is already set to some non-zero value, and the ASD flashing during initial power-up of the Johnson would be totally normal...
Cheers!
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