Maytag Dishwasher Making Noise? Causes & Fix
Most likely the sound itself names the part — grinding usually means the chopper or wash-motor bearings, a hum with no water flow means the impeller or a seized motor, rhythmic banging means the spray arm hitting something, and a continuous squeal means a dry pump seal or a worn bushing.
Know the normal sound profile#
Every phase of a Maytag MDB cycle makes characteristic sounds: a hissing rush as the inlet valve fills, a steady wash-motor hum, and drain-pump noise. Trouble is a new or louder sound that does not fit that pattern. Matching the sound and the cycle phase where it happens points straight at the failing component.
Causes at a glance#
| Sound | Likely source | When | First move |
|---|---|---|---|
| Grinding or scraping | Chopper blade or motor bearings | During wash | Inspect the chopper and motor |
| Humming, no water flow | Impeller detached or motor seized | During wash | Check the impeller and motor |
| Rhythmic banging | Spray arm hitting an item | During wash | Reposition tall items |
| Rattling or chattering | Check valve or loose drain hose | During drain | Secure the drain hose |
| Continuous squeal | Dry pump seal or worn bushing | During wash | Check water level and seal |
| Loud buzzing | Inlet valve solenoid straining | During fill | Clean or replace the valve |
Do You Have the Right Tools?
Water pressure gauge ($60), spray arm tester, float switch multimeter ($85), and drain inspection camera. Our technician arrives with $3,000+ in professional tools — your diagnostic is free.
Licensed & Insured · 90-Day Warranty · Same-Day Service
Working through the sounds#
Grinding or scraping (during wash). The source is the four-blade stainless chopper or the wash-motor bearings. A chopper issue varies in intensity as it hits food; bearing noise is steadier. Metal-on-metal scraping with no load means the chopper blade is contacting its housing and needs attention before it damages parts. Humming without water flow (during wash). The motor runs but does not pump — either the impeller has detached from the shaft or the motor is seized. It is inspected and the impeller or motor addressed. Rhythmic banging (during wash). The spray arm is striking an obstruction as it rotates, so the knock repeats at a regular interval. Reposition tall pots and utensils so the arm turns freely. Rattling or chattering (during drain). A check valve flapping in the drain line or a loose drain hose vibrating against the cabinet makes a rapid clicking. Secure the hose and inspect the check valve. Continuous squeal (during wash). A pump seal running dry, a spray-arm bushing, or a failing drain-pump bearing squeals. Confirm the sump has enough water, then inspect the seal and bushing. Loud buzzing (during fill). Some solenoid buzz is normal, but volume that grows means the inlet valve is straining, often with scale. The valve is cleaned or replaced.
Isolate the source#
- Note the sound type and the exact cycle phase it happens in.
- Enter diagnostic mode with the three-button sequence within three seconds, door closed, to run components one at a time.
- Stop the dishwasher if you hear metal-on-metal scraping with no load — that can damage parts.
- Check for tall items fouling the spray arm before assuming a mechanical fault.
- Confirm the drain hose is secured and the check valve seats before chasing the pump.
Safety First — Know the Risks
Live 120V wiring in a wet environment is one of the most dangerous DIY scenarios. Water + electricity = serious shock risk. Our techs are licensed and insured — let them handle the risk.
Licensed & Insured · 90-Day Warranty · Same-Day Service
Preventing a repeat#
- Scrape plates so large debris does not reach and jam the chopper.
- Load tall items so they cannot block the spray arm's rotation.
- Secure the drain hose so it cannot rattle against the cabinet.
- Address a new grinding or squeal early, before a bearing or seal fails outright.
- Keep the sump clear of glass shards and debris that make the chopper grind.
- Run full cycles with enough water so the pump seal never runs dry and squeals.
Hearing an odd noise? Our technicians service Maytag dishwashers same-day across Sacramento and the Bay Area. Book your repair.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
