Chapter 14 Fault CodesMH300
ID No.
Display Fault Name Description
78
STO Loss 3
(STL3)
S1–DCM and S2–DCM internal loop detection error
Action and Reset
Action condition Hardware detection
Action time Immediately act
Fault treatment parameter N/A
Reset method Hardware failure, and cannot reset. Cycle the power.
Reset condition N/A
Record Yes
Cause Corrective Actions
STO1 and SCM1, or STO2 and
SCM2 short circuit
connected
Re-connect the short circuit lines
Hardware failure
After you make sure all the wiring is correct, if STL3 fault still exists after
cycling the power, return to the factory for repair.
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