Full guide
What to check before you call
Safe observations first. Stop if anything involves smoke, gas, water near electricity, or a panel you would need to remove.
08 sections
A dishwasher that leaves water in the tub usually needs its filter cleaned and its visible drain hose and disposer connection checked, in that order. Cancel the cycle, let the tub settle, clean the accessible filter as the manual describes, and look for a kink in the hose you can see. If water remains or an error code returns, stop and book a diagnosis rather than repeating cycles.
Standing water in a dishwasher can be frustrating, especially when it interrupts a normal household routine. A symptom alone does not identify a failed part, so start with observations that are safe, repeatable, and useful if you later arrange an ASKO service visit.
This guide separates routine care from work that requires testing or disassembly. Do not bypass a lock, safety switch, or error message to keep an appliance running. Taking a few notes now can make the eventual diagnosis faster and more accurate.
Start with the simple conditions
Cancel the cycle if needed, allow the tub to settle, and follow the manual to remove and rinse the accessible filter. Make the check with the appliance in its normal position and without forcing panels, fittings, or controls. If the result changes after a simple adjustment, run one normal cycle or operation before drawing a conclusion.
A visible kink in the accessible drain hose or a recently installed disposer connection can explain a drainage complaint without indicating a failed pump. Look for a pattern: whether the issue happens every time, only with a particular load or setting, or after the appliance has been running for a while. That distinction is more valuable than repeatedly restarting the appliance.
| Symptom | Likely cause | Safe check |
|---|---|---|
| Water after cycle | Filter debris | Rinse filter |
| Slow drain | Pinched hose | Inspect visible hose |
| Drain code | Restriction or pump issue | Record code |
Standing water, slow drain and error codes compared
These are three different complaints. Standing water at the end of a cycle is a result, a slow drain is a rate, and a code is the machine’s own report. Each narrows the cause differently, so naming which one you have is more useful than the words ‘not draining’ alone.
| What you see | What it can point to | What it does not prove |
|---|---|---|
| Water above the filters after the cycle | Filter debris or a restricted drain line | It does not show a failed pump |
| Drains, but only slowly | Partial restriction, hose routing or the disposer connection | It does not show a blocked pump |
| Drain pump keeps running | A condition the guide treats as a stop-and-call | It is not a filter problem |
| Error code such as F4 | A fault the machine detected | It does not name a part; reset once, then see if it returns |
Safe checks that protect the appliance
Consult the use-and-care manual for model-specific controls, filter access, and maintenance intervals. Clean only parts described as user-serviceable, use the recommended cleaning products, and refit every removable part exactly as it was designed to sit.
Before trying another cycle, clear obstructions, reduce an unusually heavy load, and make sure airflow, water supply, or door clearance is not being restricted. Avoid repeated resets: they can hide an intermittent fault and may leave water, heat, or pressure where it should not be.
- Record any displayed message or error code before clearing it.
- Check visible hoses, vents, seals, and plugs without moving electrical connections.
- Use one controlled test rather than several back-to-back attempts.
Safe to try
- Clean the filter
- Check visible hose routing
- Record the error code
Leave to a technician
- Reach into the pump
- Disconnect wiring
- Force a drain cycle repeatedly
What the ASKO US guide says to do
For a unit that does not drain, the cleaning guide says to check and clean the filters and verify the drain line is not clogged. A manual drain is started by pressing and holding Start/Stop for 3 seconds. For an F4 code, it says to write the code down, press and hold Start/Stop for 5 seconds to reset, and contact service if it returns. If the drain pump runs continuously, turn power and water off to the unit and contact Customer Care. The guide is written for ASKO US dishwashers, so confirm these steps in the manual for your model.
Why the drain installation matters
The installation instructions for one ASKO dishwasher series say the drain hose must not be kinked, that no part of it should rise more than 37 3/8 inches above the bottom of the dishwasher, and that connections must have an inner diameter of at least 1/2 inch. A hose that was fine when installed can end up pinched after a cabinet is moved or a disposer is replaced.
What each result does and does not prove
If the tub drains after a filter clean, the filter was the cause. If a manual drain empties the tub but the next cycle leaves water again, a restriction is returning. A drain that fails even after the filter and visible hose are clear points beyond the owner-serviceable boundary.
Know when the symptom needs diagnosis
If the basic checks do not change the symptom, stop at the user-serviceable boundary. Internal wiring, heating circuits, pumps, motors, refrigerant lines, gas connections, and control boards need the correct test equipment and a technician who can verify the repair safely.
Arrange service promptly when performance is getting worse, the appliance trips a breaker, leaks near electrical parts, smells hot or burnt, makes a new grinding noise, or cannot complete a normal cycle. Do not continue operating an appliance that gives a safety warning.
What to tell the technician
Share the model number, the exact symptom, when it began, what settings were selected, and the results of the safe checks above. A photo of a code or a short description of the sound can also help, but never remove a cover to obtain it.
Careful observation is not a substitute for repair, but it is the best first step. Address the simple conditions, preserve any useful error information, and leave electrical, gas, sealed-system, and internal mechanical work to a qualified ASKO technician.
Common questions
Can I run the manual drain more than once?
Once is a reasonable test. If water keeps returning, repeating it hides the cause.
Could my garbage disposer be the problem?
It can be. A recently installed or blocked disposer connection can stop the dishwasher draining without any fault in the dishwasher.
Is leftover water a sign of a bad pump?
Not by itself. Filter debris and hose routing can explain it, and a pump is only suspected after those are ruled out.
Need help now? Visit our services page or contact us.
Official manuals and support notes are available on ASKO Support.
Write down the full model number before ordering parts. Board and sensor revisions can change which part number is correct.
A single power reset can clear a temporary fault, but repeated returns of the same code usually mean a physical cause remains.
Keep vents and filters clear between visits. Restricted airflow often mimics electrical or sensor failures.
If water, burning smells, or sparking are present, stop using the appliance and arrange a professional inspection.