MVWB850YW1 Won't Drain or Spin – What to Check and How to Fix It
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Understanding the Problem
If your Whirlpool/Maytag MVWB850YW1 top-load washer fills but won’t drain or won’t spin, the clothes remain soaked and cycles never finish. The most common causes are a clogged or failed drain pump, a defective lid lock/lid switch, a kinked or clogged drain hose, or control/shifter problems that prevent the washer from entering spin. Below are step-by-step diagnostic and repair instructions you can follow. 1) Confirm the symptom and basic checks - Start a drain/spin or rinse/spin cycle and listen. Do you hear the pump running? Any humming, grinding, or silence? - Check the error codes on the display (if present) and note them. - Verify the washer is level and that the load is not massively unbalanced (an extreme imbalance can prevent spin). 2) Check the drain hose and standpipe - Unplug the washer and pull it out far enough to access the hose. - Inspect the drain hose from the washer to the standpipe for kinks, bends, or visible clogs. - Remove the hose from the standpipe (have a towel and shallow pan ready) and inspect/remove any debris. - If the hose or standpipe is clogged, clear it and reattach. Test a drain/spin cycle. 3) Test the drain pump - With the washer unplugged and water drained, access the pump (usually at the bottom front or rear of the tub). Remove the lower access panel if applicable. - Inspect pump inlet/outlet for lint, socks, coins, or debris. Remove obstructions. - Manually try to turn the pump impeller (if accessible). It should rotate freely; binding indicates a bad or jammed pump. - Reconnect and run a drain/spin. If the pump hums but doesn’t move water, the pump motor is likely failing and needs replacement. 4) Check the lid lock / lid switch - The MVWB850YW1 uses a lid lock assembly. If the washer won’t latch, the control won’t allow spin. - Inspect the lid latch for physical damage, misalignment, or loose wiring. - With multimeter set to continuity/ohms, test the lid lock switch contacts per service manual. No continuity when locked means the lock is bad. - Replace the lid lock assembly if it fails electrical or mechanical tests. 5) Verify drain pump electrical supply - With the washer plugged in and paused mid-cycle (or using a diagnostic mode), monitor whether the control is sending voltage to the pump when it should drain. If the control is not supplying voltage but the pump is good, the control board or wiring is at fault. - Inspect the pump wiring harness and connectors for corrosion or loose pins. 6) Check for control board or shift actuator issues - If the washer drains but will not spin, or it stalls mid-cycle after draining, the problem may be the main control board, the motor drive, or the mechanical shifter (on gearcase-equipped units). - Run manufacturer diagnostic mode (refer to service manual) to observe error codes and see if the motor/drive engages on command. - If diagnostics show motor/drive error or control faults, the electronic control or the motor assembly may need replacement. 7) Replace suspect parts and retest - Replace the failed component (drain pump, lid lock, control, or harness) with OEM or high-quality aftermarket parts. Reassemble, run a drain/spin cycle, and confirm correct operation. 8) Final checks - Ensure hoses and clamps are tight, the washer is level, and the load is balanced. Test several cycles with different load sizes. Safety note: Always unplug the washer before accessing internal components and shut off the water supply if you are removing hoses or pump assemblies. Use proper tools, wear gloves, and if you are not comfortable working with electrical components, call a professional technician.
Common Symptoms
Washer fills but won’t drain or spin; water remains in tub after cycle; error codes related to drain or lid lock; pump makes grinding/humming noise or is silent.
Common Causes
- Clogged or kinked drain hose or standpipe
- Failed or jammed drain pump
- Defective lid lock / lid switch preventing spin
- Control board, motor drive, or shifter failure
- Obstructed pump inlet (coins, lint, small items) or wiring/connectors damaged
Popular Parts That Fix This Problem
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Helpful Repair Tip
To quickly isolate pump vs. control, listen during a drain cycle: a working pump will make a steady whirring sound and remove water. Silence or a faint hum + no water almost always means a bad or jammed pump; hum + resistance implies obstruction.
Frequently Asked Questions
How much does it cost to replace a drain pump on an MVWB850YW1?
Parts for a drain pump typically range from $40–$130 depending on OEM vs aftermarket. Labor for a technician is usually $100–$200 depending on region. DIY replacement is straightforward for most homeowners with basic tools and the model’s lower access panel removed.
Can I run the washer if it won't drain or spin?
No — running the washer repeatedly when it won’t drain or spin risks overflowing, motor damage, or burning out the pump motor. Diagnose and fix the drain or lid lock issue first. If you're unsure, unplug the unit and call a repair technician.
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