Samsung BQ1VQ6T012 Service Manual page 39

4-1-11 E-78
Water Over Supply Error (E-78)
YES
Connect steam generator
Is steam generator water
water level connector. level connector disconnected?
NO
NO
Does Water Valve work? : Check short circuit in the PCB part
such as relay and sensor part.
Replace the Water Valve
YES
S/W Error
After Power > On,
NO
does the symptom continue?
YES
Replace the PCB.
Perform the operation again and check if it
is working properly.
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