Question 1

dishes are coming out with white, chalky residue all over them, especially glasses.

Accepted Answer

DIAGNOSIS That's hard water scale or detergent that hasn't rinsed off properly. The most common cause on this model is a clogged or malfunctioning rinse aid dispenser, or simply not using rinse aid. FIX First, fill the rinse aid compartment (it's on the inside of the door). Set the dispenser dial to a higher setting (like 4 or 5) if your water is very hard. Then, run a cleaning cycle with a dishwasher cleaner like Affresh to clear out any scale in the lines and jets. IF THAT DIDN'T WORK The rinse aid dispenser solenoid might be faulty and not injecting rinse aid during the final rinse. Also, check that you're using a high-quality detergent formulated for hard water and not over-filling the detergent cup. HEADS UP Using too much detergent in soft water can cause the same filmy residue. Match your detergent amount to your water hardness.

Question 2

the screen on the front just says 'remote' and i can't make it do anything with the buttons.

Accepted Answer

DIAGNOSIS The dishwasher is stuck in "Remote Enable" mode, which locks out the local controls for use with a home automation system or remote start. FIX To cancel remote mode, press and hold the "Delay Start" button for about 5 seconds until you hear a beep and the display changes. If that doesn't work, try holding the "Start" button for 5 seconds. This should return control to the front panel. IF THAT DIDN'T WORK Perform a factory reset. Turn off power at the breaker for 5 minutes. Turn it back on, then immediately press and hold the "Heated Dry" and "Delay Start" buttons together for 3 seconds. This clears any stuck settings. HEADS UP If you have it connected to WiFi via Home Connect, check the app to ensure a remote start session isn't active and holding the machine in standby.

Question 3

the door won't latch shut unless i really slam it hard, and sometimes it pops open mid-cycle.

Accepted Answer

DIAGNOSIS The door latch mechanism is out of alignment or the strike plate is worn. This model has a motorized latch, and if it's not engaging smoothly, it'll fail. FIX Inspect the plastic strike plate on the door panel. Look for cracks or worn-down edges. Also, check the U-shaped latch hook on the tub frame for any obstructions or damage. Clean both areas with a damp cloth. IF THAT DIDN'T WORK The door latch motor assembly itself (part #00654532) might be failing. If you hear a grinding or weak whirring sound when you gently push the door closed, the motor gears are probably stripped. HEADS UP Slamming the door can break the latch or door hinges. If it's not latching with normal pressure, don't force it—something's misaligned or broken.

Question 4

the 'sanitized' light never comes on even after running a sani-rinse cycle. is it broken?

Accepted Answer

DIAGNOSIS The sanitize indicator requires the final rinse water to hit 150°F. If the light doesn't come on, the water isn't getting hot enough, or the high-limit thermostat isn't sensing it correctly. FIX First, make sure you're using a cycle that includes a sanitize phase, like "Sanitize" or "Heavy Wash." Ensure your home's water heater is set to at least 120°F. Run hot water at the sink next to the dishwasher until it's fully hot before starting a cycle. IF THAT DIDN'T WORK The issue could be the heating element failing to bring the water to the required temp, or the high-limit thermostat (part of the heating element assembly, part #00654510) is faulty and not signaling the control board. HEADS UP The "Sanitized" light is just an indicator. Dishes can still be clean even if the light doesn't illuminate, but it means the high-temp kill step wasn't verified.

Question 5

it's making a loud grinding noise during the wash cycle, sounds like it's coming from the bottom.

Accepted Answer

DIAGNOSIS That's the sound of the wash pump impeller chewing on something it shouldn't. A piece of glass, a bone, or a utensil has likely gotten past the filter and into the pump housing. FIX Immediately stop the cycle. Remove the lower rack and take out the entire filter assembly (twist and lift). Shine a flashlight into the sump area—you might see the offender. Use needle-nose pliers to carefully remove any debris. Also, check the small, black fine filter for damage. IF THAT DIDN'T WORK If the noise persists after clearing debris, the wash pump impeller or motor bearings are damaged from the impact and the whole pump assembly (part #00654507) will need replacing. HEADS UP Running it with this noise can destroy the pump. Always check the bottom of the tub for stray items before starting a cycle.

Question 6

the third rack on top barely gets anything wet, everything comes out bone dry and still dirty.

Accepted Answer

DIAGNOSIS The top spray arm isn't getting enough water pressure. This is usually because the upper arm is clogged with hard water scale or debris, or the supply tube to it is obstructed. FIX Remove the top rack. The spray arm up there snaps off its mount. Pull it straight down to remove it. Check all the holes for clogs—use a toothpick or a pipe cleaner. Also, look into the water inlet hole on the arm's mount and clear any debris there. Soak the arm in vinegar if you see scale. IF THAT DIDN'T WORK The water inlet valve that feeds the upper spray assembly might be failing. It's less common than a clog, but if water pressure is low everywhere, that valve (part #00482610) could be the culprit. HEADS UP Don't force the spray arm off—it's plastic and the mount can break. A firm, straight pull is all it needs.

Question 7

dishwasher is flashing 'E24' on the display and won't start a cycle. what does that mean?

Accepted Answer

DIAGNOSIS Yeah, this one's common. E24 is a drain error. The dishwasher thinks there's water left in the sump after it tried to drain, or it can't activate the drain pump. FIX Check for a clog. First, cancel the cycle. Then, pull out the lower rack and inspect the filter assembly in the bottom of the tub. Remove any large debris. Next, check the drain hose where it connects under the sink—make sure it's not kinked and the air gap or garbage disposal connection is clear. IF THAT DIDN'T WORK The drain pump itself might be jammed or failed. You can access it by removing the lower access panel. Listen for a hum when it tries to drain; if it's silent or just buzzes, the pump motor (part #00611925) is probably dead. HEADS UP Never run a cycle with an E24 active. It can lead to flooding if the drain is truly blocked.

Question 8

my thermador star sapphire dishwasher won't turn on at all, no lights, nothing. it's plugged in and the breaker is fine.

Accepted Answer

DIAGNOSIS You've got a dead control panel. This is almost always a failed electronic control board, which is the brain of this dishwasher. Power's getting to the unit, but the board isn't waking up. FIX First, try a hard reset. Turn off the circuit breaker that powers the dishwasher for a full 5 minutes. Turn it back on. If that doesn't bring any lights to life, the main control board (Thermador part #00654530) is likely fried and needs replacement. You'll need to remove the lower kick plate and the inner door panel to access it. IF THAT DIDN'T WORK Check the wiring harness connection at the control board. Sometimes a connector works loose over time from vibration. Unplug and firmly reseat every connector you see. HEADS UP Board replacements on these are a common but pricey fix. If you're not comfortable with disassembling the door, it's a pro job.

Thermador DWHD770WFM Star Sapphire Dishwasher

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