LG Studio Dishwasher TrueSteam Not Working:... | appliancefaults.com

Technical Background:

The TrueSteam feature utilizes a steam generator to produce steam, which is then injected into the dishwasher during the wash cycle. The Main Control Unit (MCU) controls the steam generator by supplying 120V AC to it via a relay. Voltage paths can be checked with a multimeter to diagnose component failure.

Symptoms:

The homeowner reports that the TrueSteam option on their LG Studio LDP6797ST dishwasher is no longer producing steam. Dishes are not as clean, and the steam function indicator light may or may not be illuminated.

Possible Causes:

Faulty Steam Generator
Defective Steam Nozzle
Blocked Water Inlet Valve
Malfunctioning Main Control Board (MCU)
Wiring Harness Issues
Low Water Pressure

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Access the steam generator. Usually located at the bottom of the dishwasher near the sump.
3

Using a multimeter, check for 120V AC at the steam generator terminals during the steam cycle. If no voltage is present, proceed to step 4.
4

Inspect the wiring harness and connections between the main control board and the steam generator for any damage or loose connections. Repair or replace as needed.
5

If the wiring is good, replace the main control board (MCU).
6

If 120V AC is present, test the steam generator resistance using a multimeter. Refer to the service manual for the correct resistance value. Replace the steam generator if the resistance is out of range.
7

Check the steam nozzle for blockage. Clean with a small brush or needle.

Safety Warning:

Always disconnect power to the appliance at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. High voltage is present inside the dishwasher; exercise caution.

Prevention:

Run the dishwasher with a dishwasher cleaner monthly to prevent mineral buildup that can clog the steam nozzle and other components. Ensure adequate water pressure (20-120 PSI) to the dishwasher.

Expert Tip:

Some LG dishwashers have a service mode. Press and hold the Half Load and Energy Saver buttons simultaneously for 3 seconds to enter the service mode. This may provide diagnostic codes related to the TrueSteam function.

Frequently Asked Questions

•What is the correct resistance reading for the steam generator on this model?

The correct resistance reading for the steam generator can be found in the LG LDP6797ST service manual. It's typically around 20-30 ohms. However, always refer to the specific manual for accurate values.

•How do I verify the water inlet valve is functioning properly?

Disconnect the power to the dishwasher and access the water inlet valve. Check for continuity across the valve's solenoid terminals. If there is no continuity, the valve is likely faulty. Also, check for 120V AC at the valve terminals when the dishwasher is filling. If voltage is present and the valve isn't opening, replace the valve.

•Where can I find the LG LDP6797ST service manual?

The LG LDP6797ST service manual can often be found online through appliance parts retailers or dedicated service manual websites. You may need to purchase it, or sometimes a free PDF version is available. Search using the full model number.

LG Studio Dishwasher TrueSteam Not Working: Troubleshooting & Repair

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct resistance reading for the steam generator on this model?

•How do I verify the water inlet valve is functioning properly?

•Where can I find the LG LDP6797ST service manual?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: