4. Water overflow due to a water level sensor malfunction
Water level sensor status
Water
overflow
detected
Status Operation
Low water level
sensor
Full water level
sensor
OPEN OPEN
Water overflow
detected
Error
Only Step 5 indicators
of the hot water and
cold water flash.
SHORT
OPEN
Water overflow sensing operation
1. Detecting water overflow
Water overflow sensor status Operation
1MΩ or lower continues for 20 seconds. Water overflow ducting status
∞
Normal status
2. Indication part operation
1) Water overflow detecting status: Low water level sensor SHORT/full water level sensor SHORT
- Only Step 4 indicators of the hot water and cold water flash.
3. Valve operation
1) Water overflow detecting status
- Feed water shut-off, feed valve power OFF, NOS valve power ON.
4. Water overflow sensor operation
1) Water overflow detecting status
- The water overflow sensor shuts off the power.
5. Cancelling the water overflow ducting status
1) Cancelling the water overflow detecting status during full water level operation.
- When the water level is changed to middle or low water level status, the water overflow
detecting status is cancelled.
2) If the water level sensors (low/full water level sensors) are defective, water overflow detecting
status is cancelled.
- The status is also cancelled when the power is disconnected and then connected again.
Compensation for power cut-off
If the power is turned off and then on again during normal operation, the previous HOT/COLD water
selection mode is maintained.
Test mode (shortened time function)
1. If the power is connected with the cold water selection switch pressed down, the FND indicators is
turned on in order and the test mode starts. (The cold water selection switch should be pressed down
for 2 seconds or more.)
2. In the test mode, all load operations and related delay time are cancelled.
3. Water overflow detecting time is cancelled. (The 20-second delay time is eliminated with the
shortened time function in the test mode.)
3. The test mode is cancelled 30 minutes later and the system operates in normal mode.
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