Frigidaire MDB125 User guide

Exploded View of Wash System
001016(MECH)
and cause the pump to air lock.The drain
loop on the side of the tub must be kept in
place after servicing.
The main pump can easily be removed by
disconnecting the drain pump connector
hose and the wiring harness connections
made at the circulation motor. Once the
pump assembly is removed from the
dishwasher, the motor/impeller assembly
can be removed from the sump by taking
out the five (5) T-20 Torx head screws from
the plastic motor bracket and then the three
(3) T-20 Torx head screws from the volute
cover. Using a large flat head screwdriver
inserted between the impeller screw and
the sump’s volute, the motor/impeller
assembly can be gently pried out of the
sump. Use the screwdriver as a lever.
Pump Assembly
The pump assembly is driven by a 1/12 HP,
shaded pole motor. Rotation is in the
counterclockwise direction at 3100 to 3200
RPM. The motor drives a pump which
supplies 100 percent filtered water at a rate
to approximately 12 GPM.
Draining is accomplished by using a small
separate synchronous drain pump mounted
to the side of the sump. The drain pump is
connected to the main pump by a small
rubber hose.The drain check valve is
located at the entrance to the drain pump.
The drain hose is attached by a worm gear
clamp to the discharge of the drain pump.
The drain is then routed up the side of the
dishwasher and attached to the side of the
tub. This drain loop insures that an air
pocket cannot form near the drain pump
900 Watt Heater
Refer to the cycle chart on the reverse side
to determine when the heater is on during
the wash cycle.
Voltage checks of the heater should be
made with the timer set in the main wash.
DrainHose
HeatingElement
Filter
SoilDirector
VoluteCover
DrainMotor
ConnectorHose
Sump
IncomingWaterSupply
Water Valve
Water Inlet
Tube
Circulation
Motor Assembly
Nut
LowerSprayArm/Tower Assembly
Tub and Door Seal
The door seal is pressed into the tub
channel for an interference fit. Center the
gasket (marked on back) at the tub top
center and press in place without stretching
or bunching.The gasket takes a short turn
at the bottom of the tub channel before
ending at the channel end wall.
Mounting
Rib
Tub
Interior
Gasket Cross Section
ShortTurn
Product Specifications WaterSupply
Minimumincomingwatertemperature.............
................................................... 120°F(49°C)
Pressure (PSI) min./max. ..................... 20/120
Connection(NPT) ........................................ 3/8”
Consumption(NormalCycle) ..........................
............ 7.2 U.S. gal., 6.0 imp. gal., 27.3 liters
Electrical
Rating ..................................... 120Volts, 60Hz
SeparateCircuit ......15ampmin.-20ampmax.
Motor(Amps).............................................. 1.1
HeaterWattage.......................................... 900
TotalAmps(loadrated) ............................. 10.0
Trouble Shooting Tips
ElectricShock Hazard
Check the list below each symptom. Repair or replace defective components as encountered.
Symptom. . .Dishwasher will not operate when
turned on (wait at least 90 seconds).
1. Fuse(blown or tripped).
2. 120 VAC supply wiring connection faulty.
3. Timer (contacts open or defective)
4. Motor(inoperative, checkresistances).
5. Door switch (open contacts).
6. Door latch not making contact with door switch.
7. Selector switch (open contacts).
Symptom. . .Motor hums but will not start or
run.
1. Motor (bad bearings or locked rotor).
2. Motor stuck due to prolonged
non-use.
Symptom. . .Motor trips out on internal thermal
overloadprotector.
1. Impropervoltage.
2. Sealfacesbinding.
3. Motorshaftbinding.
4. Motorwindingsshorted.
5. Glass or foreign items in pump.
Symptom. . .Dishwasher runs but will not heat.
1. Heaterelement(open).
2. Timerdefective.
3. Wiringorterminaldefective.
Symptom. . .Dishwasher will not pump out.
1. Drainrestricted.
2. Timercontactdefective.
3. Defectivedrainpump.
4. Air lock in drain hose.
5. Makesurehose isattachedinproperpositionon
side of tub.
6. Blockedimpeller.
7. Openwindings.
Symptom. . .Dishwasher will not fill with water.
1. Watersupply turned off.
2. Defective water inlet fill valve.
3. Check fill valve screen for obstructions.
4. Defectivefloat switch.
5. Timercontactdefective.
6. Wiringdefective.
7. Float stuck in “UP” position.
Symptom. . .Timer does not advance.
1. Timermotor (stalled or open.)
2. Check timer for power to timer motor.
3. Timer shaft binding to or knob interference with
escutcheon.
Symptom. . .Dishwasher water siphons out.
1. Drain hose (high) loop too low.
2. Drain line connected to a floor drain not vented.
(Install air gap at counter top.)
3. Drain hose not connected to side of tub.
Disconnect electrical power at the fuse box or circuit breaker box before
adjusting or replacing components. Failure to follow this warning could
result in death or serious injury.
Motor
Bracket