KitchenAid Dishwasher Repair in Toronto — Not draining / standing water

• Standing water in the tub bottom with an 8-1 in the clean-light blink log is the defining KitchenAid not-draining fault - on the HE tall-tub the control flashes the function code, pauses ~2 seconds, then flashes the problem code, and 8-1 means the unit drained too slowly (a restricted path or a weak pump). We read the 8-1 pair off the Clean light first, then confirm whether it's a blockage or the pump before pulling anything. When the pump itself is the fault the cure is the current white-front drain pump W10876537 (supersedes W10724439; also W10876537VP / 4454971; cross-refs AP6004843 / PS11738151) - the genuine unit listed for KDTM404KPS / WDT750SAHZ-class tall-tubs - but only after the sump and hose are confirmed clear.
• 8-2 in the blink log is the opposite failure and is read differently - it means the drain pump has an electrical problem (often reads as the pump stuck running or no feedback), which on this platform points at the pump wiring/relay side rather than a slow-drain restriction. We separate it from 8-1 on the same visit: an 8-1 slow-drain gets the W10876537 pump path after the sump is cleared, while an 8-2 gets the drain-pump harness spades and the control relay checked first, because dropping a healthy W10876537 into an 8-2 fault does not clear it.
• The single most common not-draining call on these KitchenAid tall-tubs isn't a dead pump at all - it's a clogged coarse/fine filter and a debris-packed sump starving the pump intake, which reads as a slow-drain 8-1 long before the pump is worn. With the lower (or third) rack out we twist the filter assembly counter-clockwise to unlock, lift it, flush it, and clear the sump screen, then demonstrate a clean drain on the way out rather than selling a pump on a maintenance problem - this is the most over-replaced 'won't drain' cause on the platform.
• A foreign object jammed against the drain-pump impeller is the second mechanical not-draining cause we look for - a sliver of broken glass, a fruit pit, a poultry bone or a hard-plastic tie that slipped past the filter wedges in the impeller chamber, stalls the drain and can itself throw an 8-1 (often with a grinding or buzzing note as the impeller rubs the debris). We open the pump intake, clear the impeller chamber and free-spin the rotor by hand before quoting the W10876537; a jammed-then-cleared pump that drains clean saves the customer a part it never needed.
• When the pump runs and the tub still leaves a shallow standing pool every cycle, the drain check valve in the pump outlet is the suspect - the one-way flapper (genuine Whirlpool 675238, supplied with its O-ring; replaces PS382661 / 3369482 / 719927) that stops drained water siphoning back into the tub. On this KitchenAid/Whirlpool platform a check valve gummed with hard-water scale or food film, or with debris lodged behind the flap so it can't seat or open fully, lets water flow back in. We backlight the flapper to confirm it isn't opening cleanly and replace the valve and O-ring rather than condemning a pump that is pumping fine.
• On a newly installed or just-relocated KitchenAid, no-drain is an install fault until proven otherwise - and KitchenAid's own product literature flags the garbage-disposal knockout plug as 'critical for draining' and a common misdiagnosis: a built-in drains through the disposal, and if the knockout was never punched out, water has nowhere to go and the unit reads as not draining with no broken part. We verify the knockout, then the drain hose's high loop / air-gap (a hose that sits too low or kinks lets water flow back into the tub and leaves standing water), before touching the pump circuit - each is a no-part fix.
• A diverter shaft seal leak at the motor area bleeds wash-circuit pressure and can masquerade as a drain/standing-water complaint on these tall-tubs - the diverter valve shaft seal grommet W10195677 (WPW10195677; cross-refs 2116942 / AP6016787 / PS11750080) is the known KitchenAid/Whirlpool leak point, and a weeping seal both puddles the floor and leaves water sitting where it shouldn't. When the sump/wash-motor assembly WPW10605057 (AP6023350 / PS11756692) is the actual pressure loss we identify it directly, but we replace the W10195677 seal grommet first when the fault is at the shaft, rather than condemning the drain pump on a leak that the pump was never causing.

KitchenAid not draining / standing water in Toronto — the local specifics

• The recurring KitchenAid not-draining pattern we see across Toronto is an 8-1 slow-drain that turns out to be a hard-water-scaled or food-packed filter/sump and impeller debris - glass, pits and bones that slipped the filter - far more often than an actually-failed pump; the genuine pump swaps (W10876537) cluster on units that pumped hard against a chronic clog for months. On older relocated units we keep finding the un-punched disposal knockout and a dropped drain hose behind the cabinet as the real cause.
• We bring the W10876537 drain pump (the white-front unit, AP6004843 / PS11738151), the Whirlpool 675238 check valve with O-ring, and the W10195677 diverter shaft seal grommet, plus filter/sump cleaning gear and a disposal knockout punch - so a scaled-filter clear, an impeller de-jam, a backflowing check valve or a confirmed pump all close on the first visit. On older tall-tubs we confirm by model/serial whether the pump is the white-front W10876537 or the separate black-front W10348269 / WPW10348269 (AP6020066 / PS11753379) before fitting, since the two are not interchangeable.

For the full KitchenAid dishwasher module — every fault, part number and code — see KitchenAid dishwasher repair in Toronto, and for the same fault across all brands the dishwasher not draining / standing water guide.