The short answer
On the MAS models a failure to drain is usually one of three things: something in the pump filter, a hose that is kinked or set at the wrong height, or a standpipe that is itself blocked. All three are owner territory and none of them needs a panel off.
What you observe
- You can hear the pump running but nothing leaves — The pump has power and is turning against a blockage, or its impeller is fouled.
- The cycle ends with water still in the drum — The clearest form of the fault. The machine has finished its timed attempt and given up.
- The standpipe or sink backs up while the machine empties — The restriction is in the house drain rather than in the machine, which is a distinction worth making before any part is bought.
- Nothing at all happens at the drain step — No pump sound points past the filter at the pump itself or its supply, which is a different half of the list.
Causes, most likely first
- A blocked pump filter — First on this family and by some distance. The filter is the last thing before the pump, the drum lets everything through to it, and on a compact machine it fills quickly.
- A kinked, trapped or badly routed drain hose — Second. A portable machine gets moved, and the hose behind it gets pushed against a wall or folded over itself.
- A blocked standpipe or house drain — The machine is healthy and the restriction is downstream. The give-away is another fixture backing up at the same time, and the repair is not an appliance repair at all.
- Debris wrapped around the pump impeller — A hair pin, a wire or a fragment of a garment past the filter will lock or foul the impeller. The tell is a pump you can hear running with nothing leaving.
Check in this order
- Start a drain or spin and listen for the pump — Running against a blockage and not running at all are two different halves of this list.
- Isolate the machine, then open the pump filter with a tray ready — The leading cause on this family, and the only part of the drain path designed for an owner to open.
- Pull the machine out and follow the drain hose end to end — Look for a fold, a crush point behind a foot, and how far the end sits inside the standpipe.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. A machine stalled full is much heavier than an empty one - drain it through the filter before moving it rather than tilting it to empty the drum.
Models in the MAS family — The models this page covers, as the product spine lists them. This family spans more than one stem, and the stem is worth confirming in the table before any part is ordered.
Reference| Model number | Family key |
|---|---|
| MAS120-2006PS/01M-US-S1 | black-decker:washer:mas |
| MAS70-1106PS/01M-US | black-decker:washer:mas |
| MAS80-506PS/01M-US | black-decker:washer:mas |
When to call
Call when the filter is clean, the hose runs clear at the right height, the standpipe drains freely and the machine still holds water. At that point the fault is the pump or its supply, both of which are behind a panel.
Other faults on this family
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
