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The pressure switch shuts off the water inlet valve when the correct level is reached. A failed switch causes continuous filling leading to overflow, or prevents filling altogether.
If the control board doesn't receive the correct water level signal, the washer hangs in the fill or sensing stage and will not advance to wash or rinse.
These fault codes are triggered when the control board detects abnormal water level readings — often caused by a faulty pressure switch or blocked pressure hose.
A defective switch can send false overflow signals to the board, causing the drain pump to activate right after fill, preventing any wash cycle from completing.
💡 Pro Tip: How to Know If Your Pressure Switch Has Failed
Your part is likely the culprit if you notice any of the following:
⚠️ Washer tub overfills with water or will not fill at all
⚠️ Cycle does not advance past the fill stage — machine hangs or pauses indefinitely
⚠️ Error codes F8 E3, F9 E1, SUD, or Lo FL appear on the display
⚠️ Washer drains immediately after filling, never completing a wash cycle
🔍 Before replacing: disconnect the pressure hose and blow gently through it. If air flows freely but the problem persists, the switch diaphragm has likely failed. Also inspect the hose for cracks, kinks, or blockage at the tub connection port — a clogged air dome can mimic a bad switch.
📦 What's in the Box
✅ 1× Water Level Pressure Switch WPW10448876 (approx. 2.40 × 1.77 × 1.54 in, snap-in harness connector)
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Disclaimer: Compatibility information, part numbers, and model fitment data on this page are sourced from manufacturer databases and third-party references. While we strive for accuracy, please verify your appliance model number before ordering. Heima is not responsible for errors or omissions in compatibility listings.
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