Troubleshooting LED's on the MC-2000 and MC-2000H
15V- The 15V light indicates that a logic circuit is being powered (needed for a closed-loop system). It will be lit anytime the treadmill is plugged into the wall and the on/off switch is in the on position. If not lit, the controller has to be replaced.
SPD SIG- Means the board is receiving a speed signal from the console. If 15V is lit but SPD SIG is not lit, check the wiring and connections from the console to the controller.
GATE- Means the board is converting voltage from AC to DC and should be providing current to the motor. If SPD SIG is lit and 15V is lit but GATE is dark, the controller has failed. The intensity of the GATE LED should change with speed input changes.
HV BUSS- The capacitor is charging and should be outputting voltage to the motor. Both the SPD SIG and GATE LEDs should be lit when HV BUSS is lit.