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Circulation pumps, heaters & sumps for water switch / non-water switch models
can’t be interchanged.
Circulation pumps
Bosch dishwashers use separate circulation and drain pumps to reduce overall
size, noise, vibration and energy consumption. This allows the use of tall tanks,
increasing overall space inside dishwashers where full-sized plates can be
placed in both upper and lower racks. Circulation pumps are suspended by
rubber straps to further reduce noise and vibration.
BLDC
Pump, motor and control come as one unit (# 665510). Speed changes as
needed for wash cycle and washability. Pump is isolated from motor, so there’s
no seal needed and no need to loosen or replace impellers.
Float
The float is a safety device which starts the drain pump if there’s too much
water in the tank. It doesn’t act like a bilge pump (i.e. it won’t drain water from
the base).
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If there’s water in the base or the float switch isn’t working, error code E5 is
possible.