Is the dishwasher running too long?
Cycle time is anywhere from 1.5 to 4 hours long depending on the cycle and options selected. Energy efficiency is gained by extending cycle time and reducing the amount of wattage and water used during the dishwasher's cycle. Efficient dishwashers run longer to save water and energy, just as driving a car slower saves on gas. If you need your dishes done sooner, you can use the 1 hour wash cycle. Using the 1 hour wash cycle will reduce drying performance and energy efficiency.
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Is the water temperature correct?
As part of normal operation, the dishwasher pauses two to three times during the cycle for thermal holds and advances once the temperature is met. When certain cycles and/or options are selected, a longer cycle is normal. Additional time is needed to heat the water to the proper temperature for cleaning and/or sanitizing your dishes. Before starting a load, run the hot water faucet nearest the sink until the water is hot; then turn off the faucet and start the dishwasher.
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Was the dishwasher recently serviced?
If your dishwasher was recently serviced, the service technician may have put the dishwasher into a diagnostic mode. When the dishwasher has been put into diagnostic mode, a calibration cycle will be ran the first time it is used after it has been ran through diagnostics. This calibration mode can cause the dishwasher to run longer than normal. This should only occur the first time the dishwasher is used after having been placed into diagnostic mode by a service technician.