Yamato Scientific WG221S Water Purifiers - Manual (Page 40)

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Safety Device and Error Codes
Troubleshooting
Troubleshooting when is lit to indicate water leak.
(1) Turn the earth leakage circuit breaker in the right side of the unit OFF.
(2) After the defect is repaired, to re-start the operation, wipe the water at the bottom areas of the device
and dry it, and also remove the leak detecting electrode and dry it .
(3) Set the electrode in the original position.
(4) Close the door.
(5) Turn the breaker ON, and push the POWER switch. Normal operation starts as the defect is repaired.