How to fix a dishwasher that runs too long?

 
Understanding Why Your Dishwasher Runs Too Long
 

A dishwasher typically runs through washing, rinsing, and drying cycles. Normally, this process should take anywhere from 1 to 3 hours. However, if your dishwasher frequently exceeds this time, it may indicate underlying issues. Before calling a professional, here are detailed steps and information on how to troubleshoot and fix a dishwasher that runs too long.
 
Check and Adjust Cycle and Options Settings
 

Sometimes your dishwasher might run too long due to specific settings or chosen cycle types:

• Heated Dry Option: The heated dry function adds time to your dishwasher’s normal cycle. Try turning this feature off and air-drying dishes instead to reduce the cycle duration.
• Sanitize or Heavy-Duty Cycles: These specialty cycles extend wash times significantly. If dishes aren't excessively dirty, select a shorter or standard cycle.
• Delay Start Setting: Accidentally activating the delay-start feature can cause your dishwasher to appear to run longer. Verify and reset this setting as needed.

  Inspect the Dishwasher for Water Heating Issues  

Dishwashers require hot water to dissolve detergent effectively and clean thoroughly. If the water isn't hot enough upon entering the dishwasher, the appliance will spend more time heating it, thus extending cycle duration.

• Check Hot Water Heater Temperature: Verify your home's hot water heater temperature. Ideally, it should be set around 120°F (49°C). If your hot water heater provides insufficient heat, adjust accordingly.
• Run Hot Water Before Starting Dishwasher: Run your kitchen faucet until the water becomes hot, then start the dishwasher immediately after. This ensures the appliance receives adequately heated water at the start of the cycle.

  Evaluate Water Supply and Pressure  

Low water pressure or restricted water flow can significantly prolong dishwasher cycles.

• Ensure Proper Water Pressure: Confirm that your home’s water pressure is consistent and adequate. Poor water pressure can delay each washing stage substantially, increasing cycle length.
• Check Inlet Valve: Inspect the dishwasher's water inlet valve for any blockages or malfunctions. A defective valve may cause inefficient water flow and longer run times. Replace the inlet valve if necessary.

  Clean or Replace Filters and Spray Arms  

A dirty or clogged filter can prolong cycles due to persistent debris that your dishwasher continuously attempts to remove.

• Remove and Clean Dishwasher Filters: Regularly remove and rinse dishwasher filters under running water. If clogged beyond cleaning, replace them entirely.
• Examine Spray Arms: Debris stuck in spray arm holes limits the dishwasher’s cleaning efficiency. Detach spray arms carefully, rinse them out, and clear any debris using a toothpick or small brush.

  Check for Drainage Issues  

Drainage problems like clogs can extend dishwasher cycles.

• Clean Out Drain Hose: Remove the drain hose and clear any obstructions carefully. A blockage can cause excess standing water and repeated attempts to drain, extending runtime.
• Examine Garbage Disposal Connection: If the dishwasher drains into the garbage disposal, thoroughly clean the disposal's drain connection to avoid backflow or partial blockage affecting your dishwasher cycle.

  Investigate Dishwasher Sensors and Thermostats  

Dishwashers contain internal sensors that dictate cycle length based on cleanliness or water temperature. Malfunctions in these sensors or thermostats can cause prolonged run times.

• Soil Sensor Malfunction: Many dishwashers have built-in soil sensors that measure cleanliness. Replace or professionally inspect malfunctioning sensors.
• Faulty Thermostat: A defective thermostat misreads water temperature, causing the heater to run continually. Replace the thermostat if it tests faulty.

  Assess Dishwasher Control Board Issues  

On rare occasions, malfunctioning control boards erroneously extend dishwasher cycles.

• Inspect the electronic control board visually for any evidence of shorts, burnt components, or damage.
• Replace a faulty control board as troubleshooting or repair of these components is typically not feasible for most users.

  When to Call a Professional  

Often, DIY troubleshooting can effectively solve your dishwasher issue. However, some problems are best managed by an experienced technician. If you're uncomfortable checking electrical components, replacing sensors, thermostats, or control boards yourself, or if your dishwasher still runs too long despite your efforts, calling a professional such as Hoffmann Brothers can help.

Whether you're located in St Louis or enjoying life around Nashville, qualified appliance technicians can analyze the problem quickly, offer reliable solutions, and perform repairs efficiently to get your dishwasher running optimally.
 
By methodically following these steps, you’ll pinpoint many of the primary reasons why your dishwasher cycles are too long and be able to implement straightforward fixes to restore proper dishwasher functionality.