Dishwasher Has Power But Won't Start Wash? Quickly Get Clean Dishes Again

It's frustrating when your dishwasher won't start a wash cycle even though it has power. Your plates are piled up while you puzzle over the lack of cleaning action.

But with some focused troubleshooting, you can likely get your appliance working again without an expensive service call.

Confirm Power is Connected Properly

First, ensure power is actually making it to the dishwasher. Check that the power cord is plugged securely into the outlet underneath or behind the unit. Verify the outlet itself has power by plugging in another device like a lamp. Also check your home's breaker or fuse box to make sure the circuit for the dishwasher hasn't tripped.

Inspect the power cord as well for any damage like exposed wires or shorts that could prevent sufficient electricity from reaching the dishwasher.

Ensure Door is Closed and Latched

The dishwasher has a sensor that prevents wash cycles from starting if the door isn't completely closed and latched. So first, make sure the door shuts all the way without obstruction. Listen for a click sound indicating the latch has fully engaged.

Adjust or Replace Faulty Door Latch

If the latch seems misaligned or faulty, try adjusting it first to achieve full closure. If that doesn't work, you'll likely need to replace broken components like the latch itself, door spring, or door switch that detects whether the latch is engaged.

Use a multimeter to test for continuity on the latch switch/spring if latch issues continue. No continuity means those parts should be replaced.

Select Proper Wash Cycle Mode

Some dishwashers won't immediately start the wash cycle if the wrong mode like Rinse Only is chosen. Verify the correct full wash cycle is selected on your unit's control panel like Normal or Heavy Duty.

Replace Unresponsive Control Panel

However, if none of the cycle selector buttons cause the dishwasher to start, the issue may lie with the control panel itself. Unresponsive buttons while the display stays blank indicate an underlying electrical issue.

Before replacing the entire control panel, check for loose wire connections or shorts behind it. But a dead control board will ultimately need replacement.

Fix Water Supply Flow Problems

For a dishwasher to begin washing, it must first fill with water. Restricted or totally stopped water flow will therefore prevent start. Check that the water supply line shut-off valves are fully open to allow filling.

Also examine the water inlet filter inside the dishwasher for any blockages. Clogged debris must be removed from this screen filter for proper water intake.

Replace Faulty Water Inlet Valve

If the water supply elements check out okay, the issue may lie with your dishwasher's internal water inlet valve. This valve controls water flow into the unit. A valve that fails to open could stop water from entering, preventing wash.

Use a multimeter to test the water inlet valve for functionality. No continuity from power means the valve should be replaced so water can flow normally again.

Diagnose Electrical Issues

Behind a "won't start but has power" failure can also lurk more complex electrical issues. Problems with interior components like heating circuits, motors, control boards, and wiring can prevent start.

Systematically test parts like thermal fuses, motors, heater elements, and electronic boards for continuity. Component replacement is needed if electrical faults are found.

Replace Defective Start Switch

Specifically, a failed start/reset switch that initiates cycle activation when pressed could be culprit. Other dishwasher buttons might light up while this switch shows no response.

Use a multimeter to check the start switch located under the control panel button for continuity when pressed. You'll likely need to replace the switch if testing confirms no continuity.

Prevent Future Start Failures

Once you remedy the current "won't start" issue, take actions so your dishwasher keeps running smoothly long-term:

• Clean dishwasher interior, including filter and spraying arms, regularly
• Use rinse aid/jet dry to prevent hard water buildup
• Don't overpack dishwasher or block spray paths
• Allow dishes to fully dry before unloading

When your dishwasher refuses to start despite functioning buttons and lights, methodically inspect elements like door latches, cycle selectors, water valves, and electrical switches. With focused troubleshooting guided by the dishwasher's symptoms, you can likely resolve the starting issue yourself before calling a technician.