Fix TurboWash Not Activating on LG WM4500HBA

Hi, I’m Drew Callahan. With over 80,000 miles of experience across North America in three different rigs, I’ve tackled appliance repairs in every climate imaginable. From fixing dryers and washers to refrigerators and ice makers in garages, campgrounds, and RVs, I’ve learned that a lot of common issues, like TurboWash not activating on the LG WM4500HBA, can often be resolved with a bit of hands-on effort at home.

Drew Callahan — Appliance Repair Expert

Experience: 10+ years servicing residential & commercial appliances • Specialties: Washers, dryers, refrigerators, dishwashers, ovens, microwaves, ice makers

TurboWash not activating

In this step-by-step repair guide, I’m going to walk you through fixing the TurboWash not activating issue on your LG WM4500HBA (Front Load). With the right tools and parts, most homeowners can complete this repair in 1–2 hours and save themselves from a costly service call.

The part you likely need: The valve that restores TurboWash spray function within seconds — the water inlet valve on Amazon →

🔨 Pro Tip from Drew

On the WM4500HBA, many technicians overlook the dual water inlet valve assembly (part number ACU72950101) and head straight for the control board — that’s a costly mistake. TurboWash requires a minimum water pressure of 14.5 PSI to trigger properly, so always check your home’s incoming pressure and inspect the valve screens for sediment buildup before replacing anything electronic.

Part of our Top 20 Washing Machine Models & Common Repair Issues Guide. Browse all washing machine repair guides for related models and issues.

Common Symptoms & Causes

If TurboWash is not activating on your LG WM4500HBA, you may notice one or more of the following signs during your wash cycle.

The TurboWash indicator light on the control panel fails to illuminate when selected
Cycle times remain unchanged at the standard duration instead of the shortened TurboWash runtime
The washer completes the full cycle without the high-pressure nozzle spray activating
Selecting TurboWash causes the control panel to beep and revert to the default wash setting

These issues are most commonly caused by a faulty control board, a worn or unresponsive membrane touchpad, or a failed water inlet valve preventing the TurboWash nozzles from receiving adequate water pressure.

Safety First

Unplug the washing machine from the power outlet before starting any repair — never work on a live appliance.
Shut off the water supply valve before disconnecting any water lines or hoses.
Wear work gloves when handling metal brackets, sheet metal edges, or sharp components.
Take photos with your phone before disconnecting any wiring harnesses or connectors.
Work in a well-lit area with enough floor space to lay removed panels flat.

Tools & Parts Needed

Essential Tools

Phillips #2 screwdriver
¼” nut driver
Torx T20 screwdriver
Multimeter
Bucket and towels

Replacement Parts

Step-by-Step Repair Instructions

Step 1

First off, confirm that TurboWash is actually enabled. The feature must be activated by holding the TurboWash button for 3 seconds — many ‘failures’ are simply the mode being off. Press and hold the button until the indicator lights; if the display acknowledges the selection but the wash cycle still shows no change in behavior, then it’s time to move on to a physical inspection.

Step 2

TurboWash relies on two dedicated spray nozzles mounted at the top of the drum that inject a high-pressure water stream to accelerate saturation. If these nozzles are scaled with calcium deposits, water flow is blocked, and the function effectively does nothing, even when electrically active. Open the washer door and look up into the top of the drum opening to visually inspect both nozzles. If you see white mineral buildup or the openings appear restricted, remove the nozzles and soak them in undiluted white vinegar for one hour to dissolve the scale. Pro tip: in hard-water areas, run a monthly tub-clean cycle with a citric acid cleaner to prevent this buildup from recurring.

Step 3

To remove the nozzles for cleaning or replacement, first unplug the machine — you don’t want to deal with any accidental sprays while working. Remove the two rear screws on the top panel and lift it free, exposing the water inlet line running across the top of the tub where the nozzles thread in. Use an adjustable wrench to unscrew them, then clear any remaining calcium deposits from the inlet ports with a small pick or brush before reinstalling.

Step 4

If the nozzles are clear, the next suspect is the dedicated TurboWash solenoid branch on the water inlet valve, located behind the rear access panel. A failed solenoid means the valve cannot open to supply water to the nozzles regardless of what the control board commands. Unplug the machine, disconnect the solenoid terminals, and test resistance across the TurboWash valve coil with a multimeter set to Rx1. A healthy coil should read 200–500 ohms, and an open-circuit (OL) reading confirms that the solenoid has failed, requiring you to replace the entire inlet valve assembly. Label your wire connectors with tape before removing them to avoid reassembly errors.

Step 5

If both the nozzles and the inlet valve solenoid test good, the fault likely lies upstream with the main control board, which sends the activation signal to the TurboWash valve. If that signal never leaves the board, no downstream component can compensate. This is a confirm-by-elimination diagnosis: only replace the control board after ruling out the nozzles and solenoid since the board is the most expensive component in this chain. Check for any visible burn marks or damaged relay contacts on the board before ordering a replacement, as physical damage can confirm the diagnosis.

Step 6

After completing any repair, run a full cycle with a load, specifically watching through the door during the wash phase to confirm you can see the spray jets actively hitting the load from the top nozzles. This is the only way to verify TurboWash is functioning as designed rather than just electrically activated. If the indicator is on but no spray is visible, recheck nozzle installation torque and confirm the inlet valve wiring harness is fully seated.

Where to Buy Replacement Parts

You can find genuine OEM and aftermarket replacement parts for your LG WM4500HBA (Front Load) on Amazon:

When to Call a Professional

If the issue persists after completing all steps above, the problem may involve a failed main control board, a worn drive motor or bearing assembly, or wiring that requires specialized diagnostic equipment. At that point, it’s best to contact a licensed appliance technician — and don’t forget to shut off both the hot and cold supply valves before any work that opens the fill circuit.

How Much Does This Repair Cost?

DIY parts for fixing TurboWash activation issues on the LG WM4500HBA typically run $10–$80, depending on whether you need a control board, wiring harness, or door latch assembly. A professional service call for the same repair generally costs $150–$300 including labor. Tackling this repair yourself can save you $100 or more.

Frequently Asked Questions

Why is TurboWash not showing up as an option on my LG WM4500HBA?

TurboWash is only available on select cycles like Normal and Bulky/Large. If you’re using an incompatible cycle such as Delicates or Sanitary, the feature will remain grayed out.

Can a software glitch cause TurboWash to stop working?

Yes, a firmware issue can disable TurboWash unexpectedly. Try performing a hard reset by unplugging the washer for 60 seconds, then check if the option becomes available.

Could a faulty water inlet valve prevent TurboWash from activating?

Absolutely — TurboWash relies on a high-pressure spray that requires proper water flow. A clogged or failing inlet valve can prevent the feature from engaging correctly.

Recommended Products

These are the parts and tools I recommend for this repair, based on compatibility and customer reviews:

As an Amazon Associate, I earn from qualifying purchases.

The Water Inlet Valve That Restores TurboWash Pressure on the WM4500HBA

When TurboWash won’t activate on this model, nine times out of ten it’s because the water inlet valve has lost its ability to deliver the high-pressure pulse the spray nozzles need. This is the first part I swap before touching the control board, and it usually solves the problem immediately.

What works

Pressure restores instantly — you’ll hear the characteristic TurboWash spray engage again within seconds of powering back on after installation.
Direct fit for the WM4500HBA with no adapter modifications needed; bolts straight into the same mounting points as the original valve.
Mineral buildup inside the old valve is often the culprit, and swapping the entire unit beats trying to clean or rebuild the original.

What doesn’t

You’ll need to turn off the water supply and disconnect both inlet hoses — a small step that catches people off guard if they haven’t done it before.
If TurboWash still doesn’t activate after the valve swap, the control board signal is the next suspect, which is a pricier and more involved repair.

I’ve had jobs where the homeowner ordered a control board first because they assumed the problem was electronic — it wasn’t, and the water inlet valve solved it for a fraction of the cost. Before you go down that road, grab the water inlet valve and test it.

the water inlet valve

I swapped mine and heard the TurboWash engage again within seconds—no adapter needed, bolts right in.

Check Price on Amazon →

Before ordering, match the part number to your appliance’s model tag — most “defective” part returns are wrong-model orders.

This post contains affiliate links. As an Amazon Associate, I earn from qualifying purchases at no extra cost to you.

Post Views: 4