A Cove dishwasher that will not drain usually has a clogged filter, a blocked or kinked drain hose, an air-gap restriction at the sink, or a jammed drain pump. Cove has no numeric codes, so it is diagnosed by clearing and testing the drain path.
Standing water in a Cove tub is almost always mechanical. The first check is the filter at the bottom of the tub, which traps food debris and, when clogged, slows or stops drainage. Cleaning it is a two-minute job that resolves many cases. Next is the drain hose behind the cabinet, a common pinch point in tighter installs, and the air gap at the sink if the installation uses one.
If the filter, hose, and air gap are clear, the drain pump is the suspect. The impeller can jam on a shard of glass, a pit, or a piece of label, which stops it from moving water even though it hums. Removing the obstruction and testing the pump under load confirms the fix, and only a confirmed-dead pump gets replaced.
Because Cove comes from the Sub-Zero Group and does not use a public numeric code system, the diagnosis is methodical and symptom-based, which suits these thorough machines. We clear the whole drain path, test the pump, and confirm the tub empties within the normal cycle time before closing the job.
Quick Reference
| Cause | How It Shows | Fix |
|---|---|---|
| Clogged filter | Slow or no drain | Clean the filter |
| Kinked/blocked hose | Water stays in tub | Clear or reroute hose |
| Air-gap restriction | Backs up at sink | Clear the air gap |
| Jammed drain pump | Pump hums, no flow | Clear or replace pump |
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