How to Install Check Valve 5220ED4004A

Quick answer: The check valve sits inline in the water-fill path and only lets water flow one way into the tub. When it sticks or wears out the washer fills slowly or not at all, or water siphons back through the fill hose. Test with a short fill or rinse-and-spin cycle.

How to Install Check Valve 5220ED4004A in an LG Washer

The check valve sits inline in the water-fill path and controls one-way water flow into the tub. When it wears out or gets stuck, water can flow the wrong direction, the washer can fill slowly or not at all, or you may notice water siphoning through the fill hose even when the washer is off. A cracked or stuck valve body can also cause a slow drip at the hose connection. Replacing check valve 5220ED4004A is a small, contained repair that most people can complete in 30 to 60 minutes.

Tools you will need

  • Phillips #2 screwdriver
  • Nut driver or socket set
  • Needle-nose pliers
  • A towel or shallow pan to catch residual water

Safety first

  • Unplug the washer, or switch off the circuit breaker that feeds it.
  • Shut off both the hot and cold water supply valves behind the washer before disconnecting any hose.
  • Expect some water left in the hoses to drain out — keep a towel or pan underneath the connection you are working on.
  • If you are not comfortable working around water connections, or the washer is hardwired rather than plugged in, call a licensed technician instead.

Removing the old check valve

  1. Unplug the washer and shut off the hot and cold water supply valves at the wall.
  2. Pull the washer out far enough from the wall to reach the back panel and the fill hose connections.
  3. Disconnect the fill hoses from the water inlet valve, holding a towel underneath to catch any water left in the line.
  4. Locate the check valve — it is typically a small plastic insert seated inside the hose fitting or built into the water inlet valve body.
  5. Before removing it, note which way the flow-direction arrow on the old valve points.
  6. Release the retaining clip or unscrew the fitting holding the valve in place, and pull the old check valve free.

Installing the new check valve

  1. Insert check valve 5220ED4004A into the fitting, matching the same flow-direction orientation as the part you removed.
  2. Seat the retaining clip, or hand-tighten the fitting back into place — do not overtighten plastic fittings, as they can crack.
  3. Reconnect the fill hoses to the water inlet valve, hand-tightening first and then giving a small additional turn if the connection uses a coupling nut.
  4. Push the washer back against the wall, keeping the hoses free of kinks.
  5. Turn the hot and cold water supply back on and check both connections for drips.
  6. Plug the washer back in, or restore power at the breaker.

Testing the repair

Run a short fill or rinse-and-spin cycle and watch the fill hoses and valve area closely for the first few minutes. Confirm the washer fills at a normal rate and stops once the tub reaches the correct level. Recheck the connections again after 24 hours, since a minor drip sometimes only shows up once the fittings have warmed and settled.

Common mistakes

  • Installing the valve backward, which can cause no fill or a very slow fill.
  • Overtightening plastic hose fittings, which can crack them.
  • Skipping the towel-and-pan step and letting residual water reach the floor.
  • Forgetting to turn the water supply back on before testing, which can look like a failed repair when it is really just a closed valve.

Related Repair Guides

  • LG parts catalog
  • Why is my LG washer rust/corrosion?
  • Why is my LG washer water leak?
  • Why is my LG washer cracked?
  • Why is my LG washer broken/damaged?

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