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ErrBase

Samsung Dishwasher Heavy Light Blinking: Leak Error Fix

Quick Answer

A blinking Heavy light means your dishwasher has detected a leak in the base pan. To fix this, you must disconnect power, remove the bottom kickplate, and dry out the plastic tray at the very bottom of the unit. Once the sensor is dry, the error should clear and allow a new cycle to start.

If you ignore this and keep forcing cycles, you're looking at a warped subfloor or water-damaged cabinet base that'll cost way more than any dishwasher repair. I've responded to probably a hundred of these Samsung calls. About 70% of the time there's actual water in that tray from a slow drip that nobody caught. The other 30% is oversudsing or a false trigger from dirty sensor contacts. Either way, don't let it sit.

SamsungDishwasherSeverity: highDifficulty: intermediate85% DIY Success
Time to Fix
30–60 min
Difficulty
intermediate
Parts Cost
—
Tools Needed
Phillips #2 screwdriver, Flashlight

What Does the HEAVY-LIGHT-BLINKING Code Mean?

Here's the deal. Samsung builds a plastic drip tray into the base of pretty much every dishwasher they make, and there's a little moisture sensor sitting in it. The second water hits that sensor, the whole machine locks up and starts blinking that Heavy light at you. Good news: most of the time you're looking at a $0 fix or maybe a $15 hose clamp. Bad news: you do have to get on the floor and track down where that water came from.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Loose hoses or pump leaks50%
Oversudsing and soap overflow30%
Sensor malfunction or debris20%

Symptoms You May Notice

  • The Heavy button light flashes continuously and won't respond to any other button presses, no matter how many times you try to cancel or restart.
  • You can hear the drain pump running non-stop, even when the dishwasher is supposed to be off, because the board is stuck in a protective loop trying to pump out water it thinks is there.
  • There's a visible wet patch or puddle on the floor right under the kickplate, sometimes just a damp ring that you'd miss if you weren't specifically looking for it.
  • The dishwasher flat-out refuses to start a new cycle. You press Start and nothing happens except that blinking light just keeps going.
  • You pull off the kickplate and see water sitting in that plastic tray at the very bottom of the unit, could be just a tablespoon, could be a couple inches deep.

Can you reset a Samsung dishwasher to clear the HEAVY-LIGHT-BLINKING code?

Once the base pan is completely dry, unplug the unit at the wall outlet or flip the breaker. Wait a full 60 seconds, not 5 or 10. Then restore power. If the drain pump doesn't immediately kick back on and the Heavy light stays off or goes solid, you're good to run a test cycle. If the blinking starts again within a few seconds of power coming back on, there's still moisture somewhere in the tray or the sensor itself is bad and needs to be replaced.

Tools Required for Diagnosis

Phillips #2 screwdriverFlashlightShop vac or heavy absorbent towelsHair dryerNeedle-nose pliersRubbing alcohol and paper towelsMultimeter (if testing sensor continuity)

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

Frequently Asked Questions

Can I just tilt the dishwasher forward to clear the Heavy light?
People try this all the time. Tilting it forward does drain the water out of the tray and yeah, it'll clear the code temporarily. But you haven't fixed anything. You've just emptied the evidence. The leak is still there, it's still dripping every cycle, and in a week or two you'll have water damage under your flooring that costs way more to fix than the actual repair would have. I replaced three sump seals last month on units where the homeowner had been tilting and resetting for months instead of fixing the drip. Don't do it.
Why does the drain pump keep running even when I turn the unit off?
It's a built-in safety protocol. Samsung programs the board to keep the drain pump running continuously as long as the moisture sensor is triggered, because the board thinks water is actively entering the tub and it's trying to keep up. The only way to stop it is to cut power at the breaker or dry out that sensor completely. Hitting the power button on the panel won't stop it. Unplugging at the wall works if the cord isn't wet. Don't leave it running for hours, that pump's not designed to run dry indefinitely.
Could a bad sensor cause the Heavy light to blink even if there's no water?
It's not super common but it definitely happens, especially on units that are 5 or more years old. If the base tray is completely dry but the error keeps coming back after reset, grab a paper towel with rubbing alcohol and wipe the sensor contacts. Hard water deposits and old detergent film can bridge those contacts and trick the board into thinking it sees a leak. If cleaning the contacts doesn't fix it, the float sensor itself might be stuck or the sensor assembly needs replacing. Usually runs about $25-40 for the part and it's not a hard swap.
Does this error mean I need a new dishwasher?
Almost never. Honestly, most of these service calls I go on end with a tightened hose clamp or a conversation about using less detergent. Even if you've got a cracked sump seal or a weeping inlet valve, you're looking at $50-150 in parts. A new mid-range Samsung dishwasher is $600-900 installed. The math isn't close. Fix it.
How long does it usually take to fix the Samsung Heavy light blinking error?
If it's just water in the base pan with no actual active leak, you're looking at 20-30 minutes total from start to test cycle. If there's a loose hose clamp or cracked drain hose, add another 15 minutes for the repair. The slowest part is letting the base pan dry completely before you restore power, rushing that step is why people end up calling me back for a second visit. Whole thing is easily doable in an afternoon for most homeowners.

Models Known to Experience HEAVY-LIGHT-BLINKING Errors

This repair applies to most Samsung dishwashers with this error code. Common model numbers include:

DW80R9950US, DW80T5550US, DW80R7061US, DW80K7050US, DW80J7550US, DW80M9550US, DW80R2031US

MS

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 17, 2026