Samsung washer won't reach full spin speed (WF42H5000AW/A2)

Hi, I’m Mike, your home appliance troubleshooting expert. When the cycle finishes, do you see any error codes, and are the clothes wetter than usual or is there any water left in the drum?

Does this happen even with a small, evenly distributed load (3–4 towels), and do you notice excessive vibration or banging when it ramps up?

What spin speed is selected on the control (e.g., High), and does the tub finish draining completely before it attempts the high‑speed spin?

Thanks for the detail. Based on your model (WF42H5000AW/A2) and the “ramp up, then back off” behavior with no error code and the tub already drained, the most likely causes are:

• Out-of-balance control limiting speed due to weak suspension: Worn shock absorbers/dampers or a tired rear spring can let the tub wobble just enough that the control keeps aborting high‑spin without showing a code.
• Slipping drive belt: This model uses a belt; if it’s stretched or glazed, the motor starts the ramp, the belt slips, and the control cuts back. Clues are a brief chirp/squeal or warm rubber smell after a spin attempt.
• Erratic motor speed sensor (Hall/tach) or wiring, or a marginal motor inverter board: The control thinks the speed is unstable and repeatedly retards the spin. Sometimes this eventually throws a 3E code, but not always.
• Water‑level sensing issue: A drifting pressure switch/air hose can make the board think water is still present, so it won’t allow maximum RPM even though the tub looks empty. Often accompanied by long drain times or occasional “SUD” behavior.
• Less likely but possible: Early drum bearing drag (you’d usually hear a low rumble when it tries to spin), or simply having the spin speed not set to High.

Safety note: If you notice a burning rubber smell, loud grinding, or the machine walking, stop using it and unplug it until checked.

If you’d like, I can walk you through quick, safe checks to narrow this down (no special tools), or help you decide whether it’s more cost‑effective to have a tech inspect the belt/shocks vs. electronics. Would you like step‑by‑step troubleshooting?

Great—let’s zero in on it. Here’s a safe, step‑by‑step plan for your WF42H5000AW/A2 to tell whether the control is limiting speed or the drive can’t hold speed:

1. Confirm settings and do a clean test

• Set spin to High and run an empty Rinse+Spin. Then try again with 3–4 damp towels only, evenly spaced.
• What to look for: It should smoothly reach high RPM. If it still surges up/down with an empty drum or small balanced load, it’s not just load balance.

2. Run drum calibration (re-teaches balance)

• Empty drum. Power On. Press and hold Temp + Delay End together ~3 seconds until “CB” appears. Press Start. It takes 2–3 minutes and ends at “0”.
• If calibration completes and high‑speed spin returns, you’re done.

3. Rule out suds/remaining detergent

• Run a Rinse+Spin with no detergent. Heavy suds make Samsung limit spin with no error. Use only HE detergent and modest doses going forward.

4. Clean the drain pump filter

• Safety: Unplug washer and have towels/tray ready.
• Open the small lower‑front access door, pull the small drain hose to empty residual water, then unscrew and clean the filter and cavity (coins, lint, hair ties). Refit firmly.
• A partially restricted drain can make the pressure system “think” water is still present, limiting RPM.

5. Quick suspension check

• With power off, press down on the front rim of the inner drum ~1 inch and release.
• It should settle within 1–2 bounces. A pogo‑stick feel points to weak shock absorbers that trigger out‑of‑balance control and prevent max spin.

6. Drive system check (belt/pulley or rotor)

• Safety: Unplug before removing the rear panel.
• Inspect the drive belt (if equipped) for glazing, cracks, or looseness; check the drum pulley and motor pulley for rubber dust. A slipping belt causes ramp‑then‑slow behavior.
• If your unit uses a rotor on the back of the tub, ensure the center bolt is tight and the connector on the motor is fully seated.

7. Pressure sensor and hose

• With power unplugged, check the small air hose from the bottom of the tub to the pressure sensor for kinks, splits, or water/soap buildup. Reseat both ends. A drifting water‑level signal prevents high spin.

8. Spin the drum by hand

• Rotate the drum manually. A smooth, quiet spin is normal. A deep rumble or grinding, or noticeable side play, points to bearing wear (have a tech confirm).

What the results mean

• Spins fine empty after calibration: Load/balance or suds were the issue; keep spin on High and avoid overloading.
• Still surges with small loads: Most common next causes are weak shocks, a slipping belt (or loose rotor bolt), or a flaky motor speed (Hall/tach) signal or inverter board.
• Wet drum after drain or gurgling/slow drain: Clean the pump filter and recheck; inspect the pressure hose.
• Rumble/grind or heavy vibration: Likely bearings or suspension—best handled by a technician.

When to call a pro

• If belt/rotor, shocks, and filter/pressure checks are fine yet it won’t reach speed, you’re likely looking at a motor speed sensor/wiring or inverter control issue.
• Stop and unplug immediately if you smell burning rubber, hear grinding, or the washer starts “walking.”

If you want, tell me what you observe on steps 1–4, and I’ll guide you to the next specific fix.