Samsung BQ1AQ4T013 Service Manual page 38

4-1-12 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.
- 36 -