FAI L: A FAI L message (along with fail tone) indicates that a circuit malfunction has been
detected, in which case speed readings are inhibited and the unit should be removed from
service and repaired. FAI L will remain in the message window until reset by being
powered off.
Hot:
The Hot message is used to indicate that the counting unit is outside of its rated
temperature range. After the counting unit cools down, it will automatically begin
normal operation.
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