S-Class SC-CF & SC-MP control system service manual

Page 39

"Nothing Seems to Work!" Flow Chart If nothing seems to work, follow Troubleshooting Flow Chart below to identify the problem:

yes

no

For 240 VAC systems:

Verify if keypad is connected correctly to board. All eight pins must be plugged in and black wire must be on top of the plug.

Do you read ≈ 240 VAC between line 1 & line 2, ≈ 120 VAC between line 1 & neutral, ≈ 120 VAC between line 2 & neutral on the board? For 120 VAC systems: Do you read ≈ 120 VAC between line 1 & neutral?

There is an electrical wiring problem. Call an electrician.

Is there a jumper cable connected between line 2 & neutral?

Replace Spa Pack if there is still nothing on keypad display.

SC-CF & SC-MP Service Manual

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