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I get a FC59 on my S811+, but the SCR's check good.

The first step when confronted with a Fault Code 59 Shorted SCR is to verify that one of the power poles (SCR's) is actually shorted.

If the SCR's prove to be serviceable, there are other conditions that can cause this fault;

  • Motor is not connected.
  • Poor connections anywhere in the mains circuit including;
    • Load side of breaker or fusible disconnect.
    • Line side of soft starter.
    • Load side of soft starter.
    • Motor lead(s).
    • Junction boxes.
    • Any/all isolation or reversing contactors.

These conditions are suspect particularly if the unit will run for a while, then fault trip.

S811+/S801+ Shorted SCR