Upper surface of low/medium
water level sensor detection area,
lower surface of water overflow
sensor detection area - 0 V
when the sensor detects the area,
5 V when not detected.
Check and replace
water level sensor
Is the water level
sensor normal?
Feed/NOS valve when room-
temperature water conditions are
normal:DC24/0volts
Check and replace MAIN PBA
Is the MAIN PBA
valve voltage normal?
Check valve latter part under
normal room-temperature water
conditions (Foreign matter)
Check and replace after verifying
Is there a FEED-NOS
valve malfunction?
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