Turn multimeter to the V setting for voltage (If your meter differs, choose the V with the wave symbol and range to 500V)
Locate the G4 junction block on the right side of the control panel above the circuit breakers on the bottom. Install black lead from your meter into the green and yellow block
**CAUTION** only hold the red test lead by the plastic portion near the wire lead. You are checking high voltage and high amperage and injury could result.
Locate the filter in the right of the of the control panel. It is labelled C100F
Test voltage of L1 to Ground
Test voltage of L2 to Ground
Test voltage of L3 to Ground
Test voltage of L1 to L2
Test voltage of L2 to L3
Test voltage of L1 to L3