My bet is was just a power glitch or a corrupted message that raised the alarm
and that your unit is OK. If the error reoccurs then you may have a hardware
problem.
There is an undocumented message that you can send to the unit to set the
allowed range of the EFC signal. Default for the Tbolt is around +/- 5V or +/-
6V. Most Tbolts seem to run with the EFC around 0V or 3V.
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