What this error means
The F18 error code on your Whirlpool washing machine means the machine has detected a drain blockage — water is not draining away quickly enough and the machine has stopped to prevent overflow.
The F18 error is a drain blockage fault and is closely related to F05. While F05 is the primary drainage error triggered when the machine fails to drain within the expected time, F18 can indicate a more specific blockage detection — often triggered during or at the end of a cycle when the pump cannot clear water from the drum at the expected flow rate. The causes are identical to F05: a blocked pump filter is the most common culprit, followed by a kinked or improperly fitted drain hose, a blocked household waste pipe or sink trap, and in a minority of cases a failing drain pump motor. The fix process is also identical — always start by cleaning the pump filter before investigating further. F18 is one of the most straightforward error codes to resolve yourself.
Step-by-step
Symptoms to look for
- F18 displayed on the control panel
- Water remaining in the drum at the end of a cycle
- Machine stopping mid-cycle and refusing to continue
- Door locked due to standing water in the drum
- Loud buzzing from pump area with no water movement
How to fix it
Turn the machine off at the wall and unplug it fully before doing anything else. Pull the machine forward slightly to access the back if needed. Place old towels on the floor around the front and back.
Find the filter access flap at the bottom front of the machine — it is usually a rectangular panel that opens by pressing or levering with a flat-head screwdriver. Inside you will find the filter cap and, on most Whirlpool models, a small emergency drain hose with a removable rubber cap. Use the emergency drain hose first if present — pull the cap and direct the flow into a shallow bowl or tray, emptying and repeating until dry. Then unscrew the main filter cap slowly anticlockwise.
Fully remove the filter cap and take it to the sink. Rinse under running water and use an old toothbrush to scrub off any limescale, fluff, or debris. Look inside the filter housing on the machine with a torch — clear anything you see there too. Common finds include coins, hairgrips, fragments of bra underwire, buttons, and compacted lint.
Trace the drain hose from the back of the machine to the standpipe or waste pipe. Check the entire length for kinks, tight bends, or anywhere the hose is pinched — particularly where it passes through a gap or behind furniture. At the standpipe, confirm the hose end is inserted no more than 15 cm. If it is pushed deeper, pull it out to 10–15 cm and secure it with the supplied hose clip.
If the drain hose shares the same waste connection as your kitchen sink, run the sink at full flow and observe whether the water drains freely. A slow-draining sink or standing water in the sink during the machine's drain phase points to a shared pipe blockage. Clear the sink trap and, if needed, use a drain unblocker on the waste pipe.
Refit the filter cap clockwise until hand-tight, close the access flap, and plug the machine back in. Select a short spin-only or rinse-and-spin programme and watch it through to completion. If the water clears and F18 does not appear, the repair is successful.
When to call an engineer
- F18 returns after cleaning filter and checking hose and waste pipe
- Drain pump making loud humming but water not moving
- No blockage found but machine still will not drain
- Pump impeller found to be cracked or seized
- Wiring fault suspected on pump circuit
Frequently asked questions
What does F18 mean on a Whirlpool washing machine?
What is the difference between F05 and F18 on a Whirlpool washing machine?
Can I fix F18 myself on a Whirlpool washing machine?
How often should I clean the pump filter on my Whirlpool washing machine?
Why does my Whirlpool washing machine show F18 even after I cleaned the filter?
🎯 What is most likely causing your Whirlpool F18 error?
⚠️ Estimates based on common faults — not a guaranteed diagnosis. Always verify before ordering parts.
Parts you may need
Enter your model number to filter results to your exact machine
Usually found on a label inside the door frame or on the back panel of the machine.
| Part | Approx. UK Cost | Find it |
|---|---|---|
| Drain Pump | £20 - £30 | 🛒 Amazon UK → |
| Drain Pump | £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.