Sub-Zero Dishwasher: Making Loud Noise
Commonly a worn wash-pump bearing, a cracked spray arm, or debris in the chopper area. Add a photo of your Sub-Zero Dishwasher in the box below: the Triage Profile says what it is, how urgent it is, and who to call.
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In the next five minutes
Safe first steps, before the call. Nothing here needs a tool.
Note what the noise sounds like and when it happens, then turn the dishwasher off and switch off its breaker.
Take a photo of the dishwasher and any code on the display, without opening anything.
If you can read its label without moving it, note the brand and model number for the call.
Everything else about this problem
Is it an emergency?
Is a loud noise from a Sub-Zero dishwasher an emergency?
Usually not an emergency. A grinding, rattling or humming that has just started most often comes from a fan, motor, belt or loose panel. Stop using it and cut the power if the noise comes with a burning smell, smoke or sparks.
Symptoms & causes
Loud grinding, humming, or clunking noises from a Sub-Zero dishwasher often indicate issues with the wash pump, motor, or foreign objects obstructing the impeller. A high-pitched whine typically points to a failing circulation pump motor bearing, while a rattling sound might suggest loose spray arms or items hitting them. Persistent loud noises during the wash cycle, especially during water circulation, are critical indicators of mechanical wear or obstruction within the pump assembly.
Tools & parts
You will likely need a screwdriver set (Phillips and flathead), a pair of pliers, and possibly a multimeter for tests. Replacement parts might include a new circulation pump motor or a drain pump, depending on the specific noise source. Gasket sealant might also be necessary if disassembling the pump housing to check for debris or replace seals.
Safety first
Always disconnect the dishwasher from its electrical power supply by unplugging it or shutting off the dedicated circuit breaker before beginning any inspection or repair. Turn off the water supply valve to the dishwasher to prevent leaks or accidental water discharge during component removal. Be cautious of sharp edges inside the dishwasher and wear appropriate gloves to protect your hands from potential cuts or chemical residue.
When to call a pro
If the noise persists after clearing visible obstructions and tightening connections, a professional technician is needed to track down complex electrical issues with the motor or control board. Significant water leaks accompanying the noise, especially from the pump housing, indicate a seal failure or cracked component that requires specialized repair tools and expertise. If the circulation pump motor itself is seized or making severe grinding noises, its replacement is often a job best left to a Sub-Zero certified technician due to the intricate plumbing and electrical connections.
Questions people ask
Can I fix a noisy Sub-Zero dishwasher myself?
Minor issues like food debris in the filter or loose spray arms can often be fixed by the homeowner. However, internal pump or motor failures usually require more advanced repair skills and specific parts.
What if the noise is a grinding sound?
A grinding sound typically suggests something is caught in the wash pump impeller or the pump motor bearings are failing. Immediately stop the cycle and inspect the pump area for foreign objects.
Related problems
More Sub-Zero dishwasher problems
Check another symptom for your Sub-Zero Dishwasher.
Making a loud noise: other brands
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What it is, how urgent, who to call
Add a photo of your Sub-Zero Dishwasher in the box at the top. The Triage Profile says what it is, how urgent it is, and who to call.