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4.5
Drain pump
4.5.1
Drain pump basics
The BLDC (Brushless DC) 9-vane drain pump has variable speed
and direction. The power control module controls pump speed
and direction, detects end of draining and blocked rotor and
corrects locked rotor conditions.
•
The dishwasher won’t run if the drain pump is
disconnected or disabled.
•
The drain pump is best accessed by pulling out the
dishwasher and placing it on it’s back.
•
Ratings: 3-pole BLDC, 54 VAC, 55 Hz, 2500 – 3500 RPM,
0.1 - 0.32 A, 10 – 25 W, class F insulation, 9-vane
impeller.
•
Resistances as follows:
o
1 – 2:
80.5
Ω (@ 68 ºF)
o
2 – 3:
80.5
Ω (@ 68 ºF)
o
3 – 1:
80.5
Ω (@ 68 ºF)
To remove the drain pump, rotate it clockwise and pull it out.
4.5.2
Drain pump operation
The impeller draws water from the sump and pumps it through
the non-return valve into the drain hose.
While water is being pumped, the BLDC (Brushless DC) motor
senses the pump status based on the current (amp) draw of the
motor windings:
•
No water
(i.e. idle – not pumping)
•
No pressure build-up
(missing pump cover)
•
Pump blockage
•
Blocked or kinked drain hose
If there is too little water in the sump, pumping is stopped.
If there is no drain pump cover in the sump, water pressure
cannot build up and the pump cannot pump. An error code is
stored in memory.
1. Wire guide
2. Seal
3. Impeller
4. Pump lock
1
2
3
4
