What this error means
The F23 error code on your Whirlpool washing machine means the water level sensor (pressure switch) has detected a fault — the machine cannot accurately determine how much water is in the drum.
The F23 error indicates a fault with the water level sensor, also known as the pressure switch or pressure transducer. This component monitors the water level inside the drum throughout the wash cycle. It works by measuring the air pressure in a small tube (the pressure hose) connected to the bottom of the drum — as the water level rises, the air in the tube compresses, and the pressure switch translates this into a water level reading that it reports to the main control board. If the board receives a reading that is out of range, impossible, or erratic, it stops the machine and displays F23. Common causes include a kinked, split, or disconnected pressure hose, a blocked pressure hose or chamber (usually clogged with detergent residue or limescale), a faulty pressure switch unit, or in rarer cases a main PCB fault. F23 should always be investigated in order of likelihood — the pressure hose is the most frequent culprit and the easiest to check.
Step-by-step
Symptoms to look for
- F23 displayed on the control panel
- Machine overfilling with water or not filling at all
- Machine stopping at the start of the fill phase
- F23 appearing consistently on every programme
- Machine filling then immediately trying to drain in a continuous loop
Diagnostic steps
Unplug for 2 minutes and restart. Also check the detergent drawer for residue build-up and clean if caked with old detergent. Run a rinse-and-spin cycle on its own to flush any excess suds from the drum before running a full test cycle.
Remove the top panel of the machine (usually two screws at the rear of the top panel, then slide backwards and lift). Inside you will see a thin, flexible tube (typically 8–10 mm diameter) running from the bottom of the drum area up to a small circular component (the pressure switch) near the top of the machine. Check the entire length of this tube for kinks, cracks, splits, or anywhere it has become disconnected from either the drum spigot or the pressure switch port.
Detach the pressure hose from the pressure switch (it usually pulls off with a gentle tug or releases with a small clip). Blow gently through the hose to check it is clear — you should feel no restriction. If the hose feels blocked, rinse it through with warm water and a thin pipe cleaner. Also blow gently into the drum spigot (the fitting the hose connects to at the bottom of the drum) to confirm the chamber itself is not blocked with limescale or detergent residue.
With the hose detached from the pressure switch, blow very gently into the pressure switch port — you should hear a faint click as the switch operates. No click suggests the switch diaphragm has failed. An engineer can test the switch electrically with a multimeter, checking for continuity across the correct terminals at different pressure levels.
Reconnect the pressure hose securely to both the drum spigot and the pressure switch port. Refit the top panel. Plug the machine back in and run a full wash cycle at a standard temperature. Monitor the fill phase to confirm the machine stops filling at the correct level and F23 does not appear.
When to call an engineer
- F23 returns after reset and detergent check
- Pressure hose confirmed as clear but F23 persists
- Pressure switch fails click test or multimeter continuity test
- Machine overfilling consistently despite clear pressure hose
- Main PCB suspected of misreading pressure switch signal
Frequently asked questions
What does F23 mean on a Whirlpool washing machine?
What is the water level sensor on a Whirlpool washing machine?
Can too much detergent cause F23 on a Whirlpool washing machine?
Can I fix F23 on a Whirlpool washing machine myself?
How much does it cost to fix F23 on a Whirlpool washing machine?
🎯 What is most likely causing your Whirlpool F23 error?
⚠️ Estimates based on common faults — not a guaranteed diagnosis. Always verify before ordering parts.
Parts you may need
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Usually found on a label inside the door frame or on the back panel of the machine.
| Part | Approx. UK Cost | Find it |
|---|---|---|
| Pressure Switch | £20 - £30 | 🛒 Amazon UK → |
| Pressure Switch | £20 - £30 | 🏷️ eBay UK → |
ℹ️ Prices are approximate. Always check the part number matches your model before ordering. Not sure of your model number? Find out how to locate it here.