MDBH969AWQ1 Dishwasher Pump Problems – What Part Fixes This?
Need the replacement part? Search your model number at for guaranteed fit and fast free shipping.
Understanding the Problem
What the 'pump' does and how it fails: Dishwashers have two pumps commonly referred to when people say “pump” — the circulation (wash) pump that moves water through the spray arms, and the drain pump that removes water at the end of a cycle. On the MDBH969AWQ1 a failed pump will cause poor or no spraying, incomplete cycles, loud noises, humming, or failure to drain. Below are practical diagnostic and repair steps you can do as a homeowner with basic tools. 1) Identify which pump is symptomatic: - If dishes are not cleaned and water remains in the tub mid-cycle, suspect the circulation (wash) pump. - If water remains in the tub at the end of the cycle and you hear a humming but no draining, suspect the drain pump. 2) Visual and simple checks (5–10 minutes): - Remove the lower dish rack. - Inspect the sump area and inlet screen for food debris, broken glass, or foreign objects that can jam an impeller. - Check spray arms for clogs and run a quick rinse cycle. 3) Listen and feel: - Run a drain or wash cycle and listen: a loud grinding or rattling often means a damaged impeller or foreign object; a steady hum with no movement often means the motor is stuck or electrically dead. 4) Electrical checks (requires a multimeter): - Unplug the dishwasher or turn off the breaker. - Access the pump motor wiring harness (bottom/front access or by removing kickplate). - With the motor disconnected, measure continuity across the motor windings (check service manual for expected ohms; typical wash motor windings often read tens to hundreds of ohms, drain motors vary). - With power restored and the pump commanded on (careful — only if you are comfortable and safe), measure for correct voltage at the harness (usually ~120 VAC in the U.S.) when the pump should be running. No voltage means control/board or wiring issue; correct voltage but no motor action means bad motor/pump. 5) Check related parts: - Float switch or door switches stuck can stop pump operation. - Check drain hose and garbage disposal connection for clogs. - Check the electronic control/relay if there is voltage to the motor but the motor does not run. 6) Basic repair steps (clear obstructions first): - Turn off power. Remove lower rack. Clear any debris from the sump, macerator, or inlet screen. Reassemble and test. 7) Replace pump assembly (when required): - Tools: screwdriver set, socket set, multimeter, towel, bucket, replacement pump assembly (see parts below). - Remove kickplate/ toe panel and tilt dishwasher forward (shut water and power, disconnect water line and power properly). - Drain any remaining water into a bucket. - Disconnect wiring harness and hoses to the pump assembly and remove mounting fasteners. - Remove old pump/motor assembly and install the new unit in reverse order, ensuring seals and gaskets are seated correctly. - Reconnect water and power, run a short cycle and check for leaks and proper operation. 8) Final checks: - Listen for smooth motor operation, check spray action, verify drain. - Inspect area under dishwasher for leaks during and after cycle. Safety note: Always disconnect power at the breaker and shut off the water supply before working on the dishwasher. If you are not comfortable working with 120VAC or performing diagnostic tests that expose live voltage, hire a qualified appliance technician.
Common Symptoms
No spray / poor cleaning, loud grinding or rattling during wash, humming without pump action, water not draining, leaks at the sump/pump area.
Common Causes
- Impeller jammed by food, glass, or broken dishware in the sump
- Pump motor windings failed or bearings seized
- Blocked drain hose or clogged filter preventing pump operation
- Electrical failure: bad wiring, relay, or control board not sending power
Popular Parts That Fix This Problem
These are the most common replacement parts that fix this problem. When you're ready to order, click below to find the right part at ProsourceParts.com — just search by your appliance model number for a guaranteed fit.
Helpful Repair Tip
To confirm which pump is bad: run the diagnostic or a cycle and listen — if you hear a hum without water movement when washing, the circulation pump motor is likely bad; if you hear a hum at drain with water still in the tub, the drain pump or drain circuit is likely the culprit. Also check for debris in the sump before ordering a new pump.
Frequently Asked Questions
Can I clean or repair a pump impeller without replacing the whole pump?
Often you can clear debris or remove a stuck object from the sump and impeller. However, if the impeller is cracked, bearings are seized, or the motor has lost winding continuity, the practical and reliable fix is to replace the entire pump/motor assembly. Cleaning will only help if the problem is a simple obstruction.
How much does it cost to replace a dishwasher pump on an MDBH969AWQ1?
Costs vary: parts for a pump assembly commonly range from $80–$300 depending on whether it’s the drain or circulation pump and OEM vs aftermarket. Labor (if you hire a tech) typically adds $100–$250 depending on travel and regional rates. Always verify part compatibility with your exact model number before ordering.
Related How-To Videos
Real DIY Repair Stories
Be the first to share your repair story!
Share Your Repair Story
Your experience helps other homeowners fix their appliances. Tell us how it went!
Can't Fix It Yourself? Find a Local Technician
It's perfectly okay to call a professional. Some repairs require specialized tools, deep teardowns, or dealing with complex systems that are better left to the pros.
Find the Right Part for Your Appliance
Don't guess — search your exact appliance model number at ProsourceParts.com to find the correct OEM compatible replacement part. They offer fast free shipping, guaranteed fit, and thousands of parts in stock.
Your Free Parts Videos
Whether your dishwasher won't drain, your dryer stopped heating, or your fridge isn't cold, we've created simple repair guides for the most common appliance problems homeowners face. Each guide explains what's going wrong, the most likely causes, and which replacement parts fix the issue. When you're ready to order, we link directly to ProsourceParts.com where you can search by model number and get the right part shipped fast.