M-D: When power on, M-D indicator lights on for 3-5 seconds, then lights off. The M-D doesn’t light continuously when treadmill in use. If continue lightening, it means MOS(FET2,FET1) broken, so replace controller board.
LIMIT: If over currency or resistance force too big, LIMIT lights on, and machine stops automatically.
S-D: S-D light on will cause machine stop. Can turn on the input power and restart treadmill. If PCB S-D lights on continue, it means PCB short circuit.
UP: Incline up light. If doesn't light, function don't work.
DOWM: Incline down light. If doesn't light, function don't work.
PWM: PWM signal from meter (console) to PCB, the PWM lights when speed up. If this light is on but machine does not work, check motor wire or change PCB
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