Bosch dishwasher troubleshooting

The table lists all the main malfunctions of dishwashers and instructions for self-repair. Find the symptoms of the breakdown and read about the ways how to solve the problem in the column next to the symptom.

Bosch Classixx dishwasher troubleshooting

ProblemSolution
Dishes do not dryThe rinse agent dispenser may be empty. Check the rinse-aid dispenser and refill it if necessary. Dishware drying can be accelerated and enhanced by opening the dishwasher door slightly and propping it open with the top rack.
Indicator light(s) do not come onA fuse may have blown or a circuit breaker tripped. Check the fuse or circuit breaker at your fuse box/breaker box and replace the fuse or reset the breaker if necessary.
Dishwasher does not startThe dishwasher door may not be properly shut. Make certain the dishwasher door is shut and latched.
Dishwasher runs a long timeIf the dishwasher completes the cycle, but the run time seems exceptionally long, it may be due to cold incoming water. Before starting the dishwasher, open the hot water faucet at the sink nearest the dishwasher. Run the water until it runs hot, then turn off the water and start the dishwasher.
Machine cycle does not advance to rinseThe water supply line may be shut off. Check the water supply valve and open it if it's shut.
White spots left on dishesMore rinse agent is needed. Go to the Adding Detergent and Rinse Agent section of this manual for instructions on increasing the amount of rinse agent dispensed.
Water not pumped from dishwasherMake certain the drain hose isn't kinked, clogged, or improperly installed. Make certain a portion of the drain hose is at least 20 inches above the dishwasher's enclosure floor. Filters may be clogged. Make certain the filter system isn't clogged The kitchen sink drain may be clogged; you may need a plumber rather than a serviceman for the dishwasher. If an air gap is installed at sink, it may be clogged.
Detergent dispenser cover will not shutYou may not be correctly shutting the detergent dispenser cover, or a cycle was not finished and should be cancelled. Go to the Adding Detergent and Rinse Agent section of this manual for instructions on shutting the detergent dispenser cover. Go to the Operating the Dishwasher section of this manual for instructions on canceling a cycle.
Streaks on glasswareToo much rinse agent is being dispensed. Go to the Adding Detergent and Rinse Agent section of this manual for instructions on decreasing the amount of rinse agent dispensed.
Rattling noisesUtensils may not be properly arranged.
Suds in dishwasherYou may have used the wrong type of dishwashing detergent. Use only automatic dishwasher detergents.
Unsatisfactory washing results• Incorrect amount of detergent.
• Utensils incorrectly arranged or rack overloaded.
• Spray arm rotation blocked by utensils.
• Spray arm nozzles need cleaning.
• Filters not properly fitted into position.
• Unsuitable cycle selected

Bosch SHX33A05US dishwasher troubleshooting

ProblemPossible CauseSuggested Action
Washability problems (dishwasher won’t clean properly)
HINT: Water level will not affect washability as water fill is measured by pressure, not time – water level cannot be adjusted.
Inappropriate dishwasher detergent used.Instruct customer to use a powdered dishwasher detergent (e.g. Cascade powder).
Blocked or clogged upper/ lower spray arms.Check spray arms - clean or replace as needed.
Water doesn’t circulate properly due to debris in circulation motor impeller.Twist and remove filter, then remove debris from right side of sump where water enters circulation pump impeller. If debris has jammed impeller, turn off and pull out dishwasher, remove tank, remove circulation motor and unscrew and clean out imp.
Filter not locked down securely, allowing debris to enter sump.
CAUTION: Use caution when removing debris from sump to avoid being cut by sharp debris such as aluminum can tabs or broken glass.
HINT: If impeller is damaged, replace entire impeller assembly or it won't seal adequately.
Twist and remove filter, then debris from sump. Instruct customer to twist and lock filter (cylinder) securely into sump. HINT: Due to high temperature rinse (161 breaking down food debris and triple filtering system trapping food debris, filters shouldn't normally clog up. Problem often caused by filter not being securely locked down.
Drain hose behind dishwasher doesn’t have an adequate loop.
Partially clogged air gap, allowing wastewater from prior washes to circulate in dishwasher.Loop drain hose behind the dishwasher (with the top of the loop) at least 20" above the floor.
Water doesnt drain properlyUnclog sink air gap.
Soap doesn't enter dishwasher due to dispenser actuator (A2) failure.
HINT: Must pull out dishwasher and remove left side panel to access float switch.
Turn off dishwasher and test actuator - replace if faulty.
HINT: One "wax" motor operates both the detergent and rinse aid dispensers through a mechanical linkage. The system always resets when door closes. Check linkage by moving it manually. Check "wax" motor by running a continuity check on its terminals.
Suds or foam remains in dishwasher.Too much detergent used. v Improper detergent used (other than powdered dishwasher detergent).Instruct customer to use less.
Dishwasher doesn’t drain properly.Instruct customer to use a powdered dishwasher detergent (e.g. Cascade powder).
Dishes won't dry properly.Rinse aid not used.Instruct customer on using rinse aid - dishes won't dry without it.
Dishwasher has an odor.Standing water in dishwasher sump.
HINT: Water level in sump should be at or below drain motor cover, v Standing water in dishwasher base.
Unclog air gap. Make sure top of drain hose loop (behind dishwasher) is at least 20" above floor (add a loop in hose if there isn't one).
Turn off dishwasher, drain water manually from dishwasher base and correct source of water leakage.
Minerals in customer water supply.Recommend customer to get water tested and use an appropriate water softener.
Food debris in dishwasher filters.Clean dishwasher filters.
Dishwasher won't run or indicator lights won’t come on.Dishwasher not turned on.Turn on/off switch on. v Check customer circuit breaker, fuse box or power connections.
No power to dishwasher.Turn off dishwasher and check door or on/off switch - adjust or replace them.
Door ajar or on/off switch failed.Turn off dishwasher and replace door latch - instruct customer to not pull on door without pulling latch.
Door latch has broken.Run test program to see if light failed. If so, turn off dishwasher and replace indicator light.
Indicator light failed.
Water doesn't drain properly.Kink in drain hose.Straighten or replace drain hose. s Clean dishwasher filters or sump.
CAUTION: Use caution when removing debris from sump to avoid being cut by sharp debris such as aluminum can tabs or broken glass.Dishwasher filter(s) or sump clogged.Turn off dishwasher, remove drain motor cover (in sump) and clean impeller. If necessary, remove drain motor to clean impeller.
Drain motor impeller clogged.Unclog sink or sink air gap. NOTE: Cleaning sink air paps or sinks are not covered under warranty.
Kitchen sink or sink air gap clogged.
Drain motor (m3) failed.Turn off dishwasher and measure resistance at motor terminals (=. 16.5 q Replace faulty motor.
Timer (SHU 30/40 models) or module (all other models) failed.Check uDltage at and wiring to timer or module. Turn off dishwasher and replace faulty timer or module (for SHU/I 43/53 models, install existing module jumper onto new module).
Improper drain connection height (< 20" or 508mm above floor).Install drain height and sink air gap according to local codes.
Dishwasher won’t stop filling or won't stop draining.Water in dishwasher base from leaky or loose hose.Turn off dishwasher, drain water manually from dishwasher base and reinstall or replace hose.
Dishwasher isn't level, causing float switch (e6) to operate.Level dishwasher using front and rear leveling legs.
Float switch or diaphragm (e6) failed.Turn off dishwasher and replace float switch or diaphragm.
Debris in dishwasher base activated float switch (e6).Turn off dishwasher and remove debris from dishwasher base.
Water fills too slowly.Low customer water supply pressure.Adjust customer water supply pressure (to 5-20 psi or 0.3-8.27 bars).
Inadequate customer water supply piping.Install appropriate piping to dishwasher according to local codes.
Scale in customer supply piping or dishwasher piping/parts from hard water.Clean or replace clogged piping/parts and have customer get water tested and use appropriate water softener.
Detergent or rinse aid won't dispense properly.Dispenser actuator (A2) failed.Turn off dishwasher and replace actuator. Free jammed detergent dispenser door.
Detergent dispenser door is jammed.
Refill rinse aid light won’t come onRinse aid level switch failed (reed switch e3 on standard dispensers or built-in actuator on top-load dispensers).Turn off dishwasher and replace reed switch (standard dispensers) or top-load dispenser.
Water doesn't circulate.Circulation motor (m2) failed.Turn off dishwasher and replace motor.
Timer (SHU 30/40 models) or module (all other models) failed.Check voltage at and wiring to timer or module. Turn off dishwasher and replace faulty timer or module (for SHU/I 43/53 models, install existing module jumper onto new module).
Water doesn’t heat up properly.Hi-Limit (f5) tripped and failed to reset.Run test program & measure current to dishwasher. If current = 11 A, Hi-Limit is OK. If not (and for all other models), turn off dishwasher and measure resistance @ Hi-Limit terminals (= .3 q). Replace faulty Hi-Limit.
NTC (temperature sensor) failed.Turn off dishwasher and check resistance of NTC (= 55 kQ @ 72F). Replace faulty NTC.
Heater (r1) failed.Run test program & measure current to dishwasher. If current = 11 A, heater is OK. If not (and for all other models), turn off dishwasher and measure heater resistance (=. 11 Q). Replace faulty heater.
Water flow switch (e5) failed.Run test program & measure current to dishwasher. If current = 11 A, flow switch is OK. If not, remove flow switch microswitch, close its contacts & measure its resistance (=. .4 Q). Replace faulty flow switch.
Timer (SHU 30/40 models) or module (all other models) failed.Check voltage at and wiring to timer or module. Turn off dishwasher and replace faulty timer or module (for SHU/I 43/53 models, install existing module jumper onto new module).
Dishwasher cycle runs too long, yet dishwasher washes, rinses and shuts off OK.Customer hot water supply isnl hot enough (< 140F/ 60 C).Adjust hot water supply according to local codes.
Water leaks from front of dishwasher.Blocked or clogged upper or lower spray arms. v Excessive foaming.Check spray arms - clean or replace as needed.

Bosch SHX43C05UC dishwasher troubleshooting

ProblemCauseAction
Dishwasher does not start1. Door may not be properly latched.1. Shut the door completely.
2. Unit may not be turned on.2. Press the main power switch to turn unit on.
3. Unit not reset or previous cycle not completed.3. Reset
4. Delay start engaged.4. Reset.
5. Interruption of electrical power supply to dish- washer or blown fuse.5. Check circuit breaker.
6. Child lock activated (select models).6. Deactivate the child lock.
7. The door may have been closed without first selecting a cycle.7. Select a cycle and close the door.
8. Water supply may not be turned on.8. Check and turn on water supply.
Dishwasher beeping (end of cycle signal)Default factory settings alert the customer that the cycle has completed by beeping. This feature can be deactivated if so desired.Adjust the volume or deactivate
Display does not illuminate or console lights are not on1. A fuse may have been blown or circuit breaker tripped.1. Check the fuse or circuit breaker box and replace the fuse or reset the breaker if necessary.
2. Door not closed or latched. Note: For models with controls on the top portion of the door, the display only illuminates when the door is opened and controls are visible.2. Ensure that door is properly latched and completely closed.
Dishwasher seems to run a longtime1. Incoming water is not warm enough.1. Before starting a cycle, run hot water faucet at the sink nearest to the dishwasher.
2. Cycle time can vary due to soil and water conditions.2. Sensors in the dishwasher automatically increase the cycle time to ensure a good wash when heavy soil is detected.
3. Rinse agent dispenser is empty.3. Add rinse agent.
4. Dishwasher connected to cold water supply.4. Verify dishwasher is connected to hot water supply plumbing.
Dishwasher seems to run a longtime1. Incoming water is not warm enough.1. Before starting a cycle, run hot water faucet at the sink nearest to the dishwasher.
2. Cycle time can vary due to soil and water conditions.2. Sensors in the dishwasher automatically increase the cycle time to ensure a good wash when heavy soil is detected.
3. Rinse agent dispenser is empty.3. Add rinse agent.
4. Dishwasher connected to cold water supply.4. Verify dishwasher is connected to hot water supply plumbing.
Dishes aren't getting clean enough1. Spray arm movement is obstructed.1. Ensure that spray arm movement is not blocked by hand rotating spray arms.
2. Spray arm nozzles clogged.2. Remove the spray arms and clean according to "Check/ Clean the Spray Arm Nozzles"
3. Improper use of detergents.3. Increase or decrease detergent depending on the water hardness.
4. Filters could be clogged.4. Clean the filter.
5. Dishes are nested or loaded too close together.5. Rearrange load such that water spray can reach all items in the dishwasher.
6. Selected wash cycle is not suitable for food soil condtions.
Dishes are not getting dry enough1. Rinse agent dispenser is empty. (Rinse agent indicator is activated).1. Add rinse agent. The use of rinse agent improves drying.
2. Improper loading of dishes.2. Rearrange load to ensure items are not nested.
3. Selected cycle does not include drying. Note: Plastic or Teflon do not typically dry as com- pletely as other items due to their inherent proper- ties.3. Rinse and Hold setting does not include drying cycle. Note: Select models offer an extra heating options to improve drying performance.
Odor1. Food debris is present at the bottom of the dishwasher.1. Remove the filters and clean.
2. Food particles are present near the door seal.2. Clean the door gasket and door seal.
3. Dishes left too long in unit before running a cycle.3. Run a Rinse/Hold cycle if you do not intend to immediately wash the dishes.
4. Residual water is present at the bottom of the dishwasher.4. Ensure the unit has completely drained from the last cycle.
5. Drain hose is obstructed.5. Remove any obstructions from the drain hose by calling qualified personnel. Note: If odor still persists, run the Normal/Regular cycle until it flushes and interrupt the cycle and place an 8 oz. cup of distilled white vinegar solution on the top rack and then finish the cycle.
Dishwasher not filling with water1. Restriction in the water supply system.1. Ensure that the water supply valve (typically located under kitchen sink) is open and check that the water supply line has no kinks and clogs.
2. Previous wash cycle was not completed.2. Cancel or change the cycle.
3. Delay-start is active.3. Cancel the delay-start or wait until delay-start time completes (times out).
Water Leaks1. Suds1. Wrong type of detergent results in suds and leaks. Use only dishwasher detergents. If suds still persist, then add one tablespoon of vegetable oil at the bottom of the dishwasher and run the desired cycle.
2. Door seal could be pulled away from track.2. Ensure that door seal is in the track.
3. Condensation vent is blocked.3. Ensure that condensation vent is not blocked.
4. Improper installation.4. Have proper installation verified by qualified personnel (water supply, drain system, leveling, plumbing).
Tub stains1. Stains on the dishwasher interior are due to hardness of water.1. Concentrated Lemon juice can reduce the build up of hard water stains. Run a normal cycle until it flushes and interrupt the cycle and then place an 8 oz. cup of the concentrated lemon solution on the top rack and finish the cycle. This can be done periodically to avoid build up.
2. Silverware in contact with tub.2. Ensure that the silverware does not make contact with the tub while running a cycle.
Streaks on glassware or residue on the dishesIncorrect rinse agent setting.Depending on the hardness of water, adjust the rinse agent dispenser.
Fascia panel discolored or markedAbrasive cleaner used.Use mild detergents with soft damp cloth.
Noise during wash cycleThe dishes may not be arranged properly.Water circulation sound is normal, but if you suspect items are banging into each other or into the spray arms
Detergent dispenser cover will not shut1. Improper operation of detergent cover.
2. Previous cycle has not been finished, reset, or cycle was interrupted.
Unable to select desired cyclePrevious cycle has not finished.

Bosch Silence Plus 44 DBA dishwasher troubleshooting

ProblemCauseAction
Dishwasher does not start1. Door may not be properly latched1. Shut the door completely
2. Unit may not be turned on2. Press the main power switch to turn unit on
3. Unit not reset or previous cycle not completed
4. Delay start engaged
5. Interruption of electrical power supply to dishwasher or blown fuse.5. Check circuit breaker
6. The door may have been closed without first selecting a cycle6. Select a cycle and close the door.
7. Water supply may not be turned on7. Check and turn on water supply
Display does not illuminate1. A fuse may have been blown or circuit breaker tripped1. Check the fuse or circuit breaker box and replace the fuse or reset the breaker if necessary
2. Door not closed or latched2. Ensure door is properly latched and completely closed
Dishwasher seems to run a long time1. Incoming water is not warm enough1. Before starting a cycle, run hot water faucet at the sink closest to the dishwasher
2. Cycle time can vary due to soil and water conditions2. Sensors in the dishwasher automatically increase the cycle time to ensure a good wash when heavy soil is detected
3. Rinse agent dispenser is empty3. Add rinse agent
4. Dishwasher connected to cold water supply4. Verify dishwasher is connected to hot water supply plumbing
Dishes are not getting clean enough1. Spray arm movement obstructed1. Ensure that spray arm movement is not blocked by hand rotating spray arms before starting cycle
2. Spray arm nozzles clogged2. Remove the spray arms and clean according to the “Care and Maintenance” section of the manual
3. Improper use of detergents3. Increase or decrease detergent depending on the water hardness
4. Filters could be clogged4. Clean the filters
5. Dishes are nested or loaded too close together5. Rearrange load such that water spray can reach all items in the dishwasher
6. Selected wash cycle is not suitable for food soil conditions6. Read Wash Cycle Information
Dishes are not getting dry enough1. Rinse agent dispenser is empty1. Add rinse agent - the use of rinse agent improves drying
2. Improper loading of dishes2. Rearrange load to ensure items are not nesting
3. Selected cycle does not include drying Note: Plastic or Teflon do not typically dry as well as other items due to their inherent properties3. Rinse and Hold setting does not include drying Note: Select models offer an extra heating option to improve drying performance.
Odor1. Food debris is present at the bottom of the dishwasher1. Remove the filters and clean
2. Food particles are present near the door seal
3. Dishes left in unit too long before running a cycle3. Run a Rinse and Hold cycle if you do not intend to immediately wash the dishes
4. Residual water is present at the bottom of the dishwasher4. Ensure the unit has completely drained from the last cycle
5. Drain hose is obstructed5. Remove any obstructions from the drain hose by calling qualified personnel.
Dishwasher not filling with water or “Check water supply” display lights up1. Restriction in the water supply system1. Ensure that the water supply valve (typically located under kitchen sink) is open and check that the water supply line has no kinks or clogs
2. Previous wash cycle was not completed
3. Delay start is active3. Cancel the delay start or wait until delay start time completes
4. Household water supply turned off4. Turn on water supply
Water leaks1. Suds1. Wrong type of detergent results in suds and leaks - use only dishwasher detergents. If suds still persist, add one tablespoon of vegetable oil at the bottom of the dish- washer and run the desired cycle.
2. Door seal could be pulled away from track2. Ensure the door seal is in the track
3. Condensation vent is blocked3. Ensure that condensation vent is not blocked
4. Improper installation4. Have proper installation verified by qualified personnel (water supply, drain system, leveling, plumbing)
Tub stains1. Stains on the dishwasher interior are due to water hardness1. Concentrated lemon juice can reduce the build up of hard water stains. Run Normal cycle until it flushes and interrupt the cycle and then place an 8oz. cup of the con- centrated lemon solution on the top rack and finish the cycle, this can be done periodically to avoid build up.
2. Silverware in contact with tub2. Ensure that silverware does not make contact with the tub while running a cycle.
Streaks on glassware or residue on the dishes1. Incorrect rinse aid setting1. Depending on the hardness of water, adjust the rinse agent dispenser.
Fascia panel discolored or marked1. Abrasive cleaner used1. Use mild detergents with soft damp cloth
Noise during wash cycle1. Dishes may not be arranged properly1. Water circulation sound is normal, but if you suspect items are banging into each other or into the spray arms.
Detergent dis- penser cover will not shut1. Improper operation of detergent cover
2. Previous cycle has not been finished or rest or cycle or interrupted
Unable to select desired cycle1. Previous cycle has not finished