Here are six popular faults that cause the dishwasher to wash dishes poorly, or to stop and interrupt the washing cycle altogether.
1. The water heater is out of order.
Dishwashers are equipped with a device for heating water. The water heater is the most susceptible to limescale buildup and will “burn out” if operated continuously for a long period.
CAUTION: When the heating element in the water heater breaks down, the water does not heat up and the dishwasher heats up badly because most of the dirt cannot be removed with cold water.
HOW TO REMOVE: Requires replacement with a water heating device.
2. Fault in circulation pump
The water pump is pumping water inside the dishwasher.
SIGNS: If it fails, it will not pump water to the dishes and therefore will not start the washing process.
HOW TO REMOVE: The circulation pump needs to be replaced.
3. Sprinkler impeller has failed
The impeller is the special mechanism that rotates the sprinkler bead.
SIGNS: If the impeller fails, the spray arms will not rotate (one spray arm or both may fail) and the water will not rinse properly.
HOW TO REMOVE: Impeller must be replaced.
4. Faulty temperature sensor
Thermo-sensor – measures water temperature and sends this information to the program module which will send a command to the heating element to heat.
SIGNIFICANT DETAILS: If the sensor is not reporting the temperature, the water is not getting warm and the dishwasher is not rinsing well with cold water.
HOW TO REMOVE: The temperature sensor needs to be replaced.
5. Software module malfunction or failure
The program module sends commands to all the technical parts of the dishwasher, e.g. “heat water”, “drain water”, and “draw water”.
SIGNIFICANT DETAILS: If the program module malfunctions, the dishwasher malfunctions or stops working completely.
HOW TO SOLVE: The module needs to be “reflashed” or replaced.
6. Water turbidity sensor malfunction (only on higher-priced dishwashers)
The more expensive dishwashers are fitted with a turbidity sensor. It provides information to the program module on the condition of the water – if it is turbid, the dishes are still dirty and the wash cycle must be continued.
NOTES: When the sensor fails the program module does not “understand” the current state of dirt and the dishwasher will not end the wash cycle correctly.
HOW TO REMOVE: The turbidity sensor needs to be replaced.
All of these breakdowns can only be repaired by a qualified technician who has the specialized knowledge, experience, and specialized equipment necessary for diagnosis and repair. Attempts to repair the dishwasher yourself can lead to disastrous results – and it’s good if the specialist then manages to eliminate the consequences of such amateurishness. In our practice, we have had cases where we had to change the “burned out” control module because the client tried to install the temperature sensor himself, and did it wrong. In the end, the total cost of the repair was much higher – because the control module is the “brain” of the dishwasher.
Trust your “helper” to the experienced hands of certified technicians. Chula Vista Appliance Repair Company is pleased to offer efficient dishwasher repair services in and around San Diego County. We strive to provide superior repairs using only high-quality replacement parts that come with a manufacturer’s warranty, so you can rely on a dishwasher repair technician to fix the problem and keep your machine working properly for a long time, as well as fully restore its main function – quality dishwashing!