Maytag MDBH955AWS1 Dishwasher — Common Problems, Diagnosis & How to Fix Them
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Understanding the Problem
This guide covers the most common problems on the Maytag MDBH955AWS1 built‑in dishwasher (draining, filling, leaks, noise and failure to start). Start by identifying the symptom, then follow the numbered diagnostics and repair steps below for that symptom. Each section includes practical "how to fix" steps you can perform with basic tools. 1) Dishwasher Won’t Drain - Check first: filter/sump clog, drain hose kinked, garbage disposal knockout plug, drain pump failure. - Diagnostic steps: 1. Run a short drain cycle and listen for the drain pump. If you hear nothing, power off and access the pump. 2. Remove bottom rack, pull out filter screen and clean debris from the sump. 3. Inspect the drain hose under the sink for kinks and confirm the connection to the disposal or sink drain is clear. If recently installed new disposal, ensure the knockout plug was removed. 4. Remove lower kick plate, disconnect power, place a towel under machine, and visually inspect the drain pump for debris. Try to rotate the impeller by hand (with power off). 5. Test pump with a multimeter for continuity (typical pump motor shows low ohms). No continuity = replace drain pump. - How to fix: - Clear clogs from filter and hose; re-run. If pump spins but doesn't pump, replace the drain pump assembly (see parts list). - Replacement: unplug dishwasher, remove lower access panel, disconnect hose clamps and wiring from pump, remove mounting screws, install new pump, reconnect hoses/wiring, restore power and test. 2) Dishwasher Won’t Fill or Low Water - Check first: water supply valve, water inlet valve, float switch or float stuck, supply line kinked. - Diagnostic steps: 1. Verify the hot water supply under the sink is ON and hose not kinked. 2. Listen at start of cycle for inlet valve click. No sound may indicate a bad inlet valve or no power to it. 3. Remove toe kick, place a cup in tub to catch water, start a fill cycle and check whether water enters. If small trickle, inlet valve likely failing or low house water pressure. 4. Inspect float assembly in sump to ensure it moves freely (hairline specks can jam it). 5. Test inlet valve electrically for continuity; no continuity = replace valve. - How to fix: - If float stuck, clean and free it. If inlet valve defective, shut off water and power, remove lower panel, disconnect water line and wiring, remove valve mounting screws, install new valve, reconnect water and wiring, and test for leaks. 3) Leaks (Under Machine or Door) - Check first: door gasket, spray arm, tub/crack, loose hose clamps, detergent dispenser, or faulty water inlet connections. - Diagnostic steps: 1. Run a short cycle and observe to locate leak source (front, under, or between tub and door). 2. Inspect door gasket for tears or debris. Clean gasket and check seal by pressing door closed on a paper towel—pull to see if it grips uniformly. 3. Inspect spray arms and support for cracks; ensure filter and sump are seated correctly (misalignment can spray water at door seal). 4. Remove lower kick plate and run a brief cycle while watching hoses, clamps, and pump area for drips. - How to fix: - Replace damaged door gasket or torn spray arm. Tighten or replace hose clamps on inlet/drain lines. If leak from pump housing, replace the pump/motor assembly. 4) Dishwashing Performance Issues (Poor Cleaning) - Check first: clogged filters, spray arms blocked, wrong detergent, overloading, water temperature too low, circulation pump problem. - Diagnostic steps: 1. Remove and clean the filter assembly and check for impeller blockage in the circulation area. 2. Remove and inspect spray arms—clear any clogged holes with a toothpick and spin them to ensure free rotation. 3. Ensure hot water at the sink is at least 120°F (run the hot tap for a minute before starting cycle). 4. If you hear the circulation pump run but weak spray, test pump and motor for proper operation; no or weak flow indicates pump or impeller wear. - How to fix: - Clean or replace filters and spray arms. Replace circulation motor/pump assembly if it's failing to produce pressure. 5) Dishwasher Won’t Start, Buttons Not Responding, or Error Codes - Check first: door latch, control lock, power supply, control board or thermal fuse. - Diagnostic steps: 1. Ensure the door fully latches; a faulty latch prevents start. Inspect latch for broken tab or switch activation. 2. Look at control lock/keypad lock—press and hold the "Heated Dry" or "Control Lock" button (refer to your manual) to toggle. 3. Try a simple reset: turn off breaker to the dishwasher for 60 seconds, then restore power. 4. If receiving error codes (consult your manual for code meanings), trace to the component indicated (e.g., F7 = water inlet, F8 = heater, etc.). 5. For no power or unresponsive panel, check household breaker and incoming voltage, then test the main control board for visible burn marks or loose connectors. - How to fix: - Replace a failed door latch or switch. Replace main control board if it's failed (confirm with voltage and continuity checks). If thermal fuse blown, replace it and investigate reason for overheating (blocked vent or long cycles). Safety note: Always disconnect power at the breaker and shut off the water supply before accessing internal dishwasher components. Use insulated tools for electrical checks. If you are uncomfortable working with electrical components or plumbing, hire a licensed technician.
Common Symptoms
Not draining, not filling, leaking, loud grinding or humming noises, poor cleaning performance, or control panel not responding.
Common Causes
- Clogged filters or drain hose
- Failed drain pump or circulation pump motor
- Faulty water inlet valve or low water pressure
- Worn door gasket or loose hose/clamp
- Failed control board, door latch, or thermal fuse
Popular Parts That Fix This Problem
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Helpful Repair Tip
Start by removing and thoroughly cleaning the filter and checking the drain hose and garbage disposal knockout—these simple checks fix most drain and cleaning complaints.
Frequently Asked Questions
How do I reset my Maytag MDBH955AWS1 dishwasher?
To reset: turn off the dishwasher by pressing the Cancel/Drain button for 3–5 seconds (if responsive). If the control is unresponsive or error persists, switch off the circuit breaker supplying the dishwasher for 60 seconds, then turn it back on. This clears most electronic glitches.
Why is my dishwasher making a loud humming or grinding noise?
A humming noise often means the drain pump or circulation pump is trying to run but is blocked or the motor is failing. Grinding can indicate debris stuck in the pump impeller or worn bearings in the motor. Remove the bottom panel, check the sump/impeller area for debris, and test the pump motor. Replace the pump if cleaning doesn't stop the noise.
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