The short answer for these models
When the tub stays full, the question is whether the pump is failing or whether it is being defeated. A blocked filter, a crushed hose or a hose end at the wrong height defeat a perfectly healthy pump, and the machine cannot tell you which. On the MAS washers the brand-level answer holds and the order does not: a tap-adapter installation gives up its pressure and its drain height the moment the adapter slips, so a fault that looks electrical on a plumbed machine is usually mechanical on a portable one, so the supply and adapter checks come before the rest on these models.
What you actually see
- Before the list: which of the MAS forms is in front of you — See where the water comes from. On a portable installation two failure points sit outside the machine and imitate faults inside it.
- The cycle finishes with the tub still full — The pump-out step ran and achieved nothing, which points at the path rather than at the timing.
- Water comes back into the tub after it empties — Water reappears in the drum after it has emptied, which is the drain feeding the machine rather than the reverse.
- NEAR MISS — water on the floor rather than in the tub — That is a leak, not a drainage failure, and the page about water where it should not be covers it.
Causes, most likely first on this family
- A blockage in the standpipe, the sink trap or the house drain — It ranks here because the evidence is usually somewhere else in the room, which is why it gets missed. It is placed first on the MAS models rather than where the brand-level page puts it, because the form of the unit decides how much this can explain — which makes the supply and adapter checks the checks with the most to say.
- The drain pump or its control — It is reached by exclusion: filter clear, hose right, plumbing clear, and still nothing leaves.
The order the checks belong in
- First — look at the hose before you open anything — The hose is free to check, visible from outside, and the cause people assume cannot be it. On these models this is the step the construction changes: the answer only tells you something once you know which form the unit is.
- Second — listen at the pump during the drain step — Listen at the pump during the drain step. Silence and straining mean different things, and by now you can tell which.
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. Assume the filter housing is full before you open it: towels down, a shallow tray under it, and a cooled machine if the last wash was hot. Water hot enough to scald leaves a filter at the same speed as cold water and gives no warning.
Where the owner job ends
The owner half is the filter, the hose and its height. Beyond that — the pump, the pressure system and the wiring — is a visit. Say whether the machine tries to drain and fails, or never tries at all; the two point at different parts.
The other symptoms covered for this family
- Black+Decker MAS Washer Will Not Start: The Family-Specific Checks
- Black+Decker MAS Washer Pausing Partway: Where This Family Differs
- Black+Decker MAS Washer Leaking: What Changes on This Family
- Black+Decker MAS Washer Sounds: What Changes on This Family
- Black+Decker MAS Washer: Which Problems Happen 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.
