THERMADOR DISH-WASHERS-HOW TO REMOVE DRAIN PUMP AND DISPENSERS & AQUA SENSORS

THERMADOR _ SIEMENS _ BOSH & GAGGENAU – DISHWASHERS

DRAIN PUMP

Drain pumps are mounted to sumps in the front of dishwashers -- they’re easily accessible from the front of dishwashers by removing toe kicks.

To remove & install drain pump
Tools needed: small flat blade screwdriver (for unlocking terminals).> Remove toe kick/base cover, pull up terminal cover and disconnect wires (using screwdriver to unlock locking terminals).> To remove pump, pull latch (on circular collar) & rotate pump clockwise (cw). To install new pump, insert @ 2:00 position & rotate counterclockwise (ccw).> Clean water & debris from base, then check float operation.> Connect wires, then install base cover & toe kick.

{See previous posts here for more details}

INSTALLATION TIPS

* Must have drain hoses with high loops (min. 20” high), even with air gaps *.* Drain hoses can be up to 10’ long – can add up to 4’ to dishwasher hose.* Secure drain hoses to rear of dishwashers with non-metal bands.* Make sure drain hoses aren’t kinked.* UC/43 & later drain pumps have (Rast 5) connectors, which aren’t interchangeable with older pumps with spade terminals.

# Drain pump is rated 120V, 60 Hz, 35W, 0.85A.

# Drain pumps in installations with Johnson Tees (in Washington State) must use stronger 4-vane pumps (#184178). Standard 9-vane drain pumps (#167082) are quieter and smoother than 4-vane pumps. Older pumps had 6-vanes.

# High loops are needed to prevent cavitating.  Often improper installations, not drain pump issues, cause dishwashers to not drain properly.

DISPENSERS_DISASSEMBLE PROCEDURE

CAUTION: Inner door edges are sharp.   Cover door edges and remove dispenser carefully.

To remove/install dispensers
> Remove outer door, remove fascia panel & disconnect wire harness from fascia panel.
> Disconnect wire harness above dispenser, then remove wires to wax motor & sensor.
> Disconnect condensation tube (for older models with condensation tubes in doors).
> Remove any tape or wire ties. Bring replacement wire ties for reassembly.
> Bend retainer tabs, then push dispenser inward toward tank. Protect hand with towel as inner door edges are sharp.
> Replace from inside of tank - position O-ring seal and bend tabs to secure. Lubricate O-rings with rinse-aid & support inner doors to avoid damage if O-rings stick.

During each wash program, the wax motor opens twice, once to dispense detergent and again to dispense rinse-aid. The wax motor opens the same -- linkages open the detergent door & operate the rinse-aid dosage plunger. Dispensers can have reed switches or optical rinse-aid sensors. 

The white plastic linkage opens the detergent dispenser door, then cocks in place to dispense rinse-aid when the wax motor operates again. After the 2nd operation, the linkage resets for the next wash.

Optical dispensers have different connections and can’t be substituted for reed switch dispensers. Note 431413 top load dispensers also use solenoid actuators

instead of wax motors.

OPTICAL SENSOR DISPENSERS

Optical and top-load dispensers measure rinse-aid levels with optical sensors instead of reed switches.

DOOR LATCHES

Other than occasional misalignment, the only door latch repairs will be replacing micro switches. OlderSHU43/53/68 dishwashers used door latches with rods connecting them with on/off switches.  [Use only latches specified for each model. Latches can have differing closing forces, be suitable for specific door seals & can have child locks.]

* Remove T-20 Torx fascia panel screws from inner door.
* Lower fascia panel from door.
* Locate door latch in console.
* Bend out console metal tabs to allow latch removal.   

{Door latches for UC/14 & up models are different than UC/06 - UC/12 models; they cannot be interchanged. Must replace strike plate & door latch together.}

AQUA SENSORS

The aqua sensor only affects energy usage, eliminating a pre-wash and/or pre-rinse cycle if water is clean. Most customers won’t notice if an aqua sensor fails. It’s located on the rear of the sump and can be reached through the left side of the dishwasher (after the left side panel is removed – see page 4). It’s not necessary to block up the tank to reach the aqua sensor.

To change out the aqua sensor, pull off the connector and pull out the aqua sensor (toward the rear of the dishwasher). The aqua sensor slides into slots in the sump. Make sure the aqua sensor is properly inserted into the slots.

The Apexx Sensotronic 2 aqua sensor # 175340is similar to standard aqua sensor #165279, except it has two (red & green) soil sensors. They mount the same way, but are not interchangeable.

CLICK ON THE PICTURES TO MAGNIFY