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Quick answer: most steam iron faults come down to three things: the iron is not hot enough (dial below the steam zone, or it has gone into auto-off standby), there is limescale inside it, or the wrong liquid has gone in the tank. Which?’s 2024 survey of 5,884 owners found leaking or spitting was the most common fault (35%), followed by a failed heating element (26%) and inconsistent steam (21%). Turn the dial to the steam zone, wait for the light, and descale. Unplug it straight away if you smell burning plastic or see smoke from the body or cord.
Each section below gives the usual cause, the fix, and when to stop and contact the manufacturer, drawn from Tefal, Philips, Russell Hobbs and Morphy Richards support pages and Which?’s fault research.
| Symptom | Most likely cause | First thing to try |
|---|---|---|
| No steam | Dial below the steam zone, or scale | Two dots or above; wait for the light |
| Not heating, light flashing | Auto-off standby | Lift the iron and stand it on its heel |
| Leaking from the soleplate | Steam used before the iron is hot | Wait for the light; fewer boosts |
| Spitting | Scale flakes in the steam ducts | Descale |
| Brown water | Scale mixed with residue, or additives | Self-clean, then steam over a towel |
| White marks on dark clothes | Scale flakes | Descale; brush marks off when dry |
| Shiny or scorch marks | Too hot for the fabric | Lower setting; pressing cloth |
| Sticking or dragging | Residue on the soleplate | Clean the soleplate when cool |
| Burning smell, new iron | Manufacturing residue | Steam over a cloth for a few minutes |
1. No steam, or very little
Cause. Steam only forms when the soleplate is hot enough to flash water into vapour. Philips states that a dial iron “will not be hot enough to steam” below the steam zone, which is two dots or above. The other common cause is scale. Which? found that inconsistent performance made up 21% of faults; in our reading, limescale clogging the steam ducts is the usual reason.
Fix. Check the tank and the steam control, turn the dial to two dots or above, wait for the light to go out (two to three minutes, Philips says), then press steam away from the clothes until it flows. If steam is still weak, run the self-clean or anti-calc routine: see how to descale a steam iron, or for a generator how to clean a steam generator iron.
When to stop. If the iron gets hot but gives no steam at maximum after descaling, or a generator’s pump hums with nothing coming out, the pump or valve has failed; contact the manufacturer rather than opening the iron.
2. Not heating, or the light keeps flashing
Cause. A flashing light on a cold iron almost always means auto shut-off, not a fault. Philips states its steam irons switch off when left flat for more than 30 seconds or on the heel for more than 8 minutes, and Russell Hobbs manuals give the same timings. Philips steam generators go to standby after 5 to 10 minutes with the power light blinking. Settings are kept.
Fix. Lift the iron, tilt it forward and stand it on its heel; it reheats in a minute or two. On a generator, press the on/off button. If nothing happens, check the plug, the socket and the dial.
When to stop. If the iron never warms and no light comes on, the element or thermal fuse has gone. Which? recorded a failed element as the second most common fault (26%) and advises “seeking professional help unless you’re a qualified electrician”.
3. Leaking water from the soleplate
Cause. Philips lists the usual reasons: the dial is below the steam zone, so water passes through unconverted; the boost has been pressed too often, so water pools on the soleplate; or steam in a generator’s hose has cooled and condensed. Tefal’s manuals add an overfilled tank.
Fix. Set two dots or above and wait for the light before using steam. Iron flat, and leave a few seconds between boosts. On a generator, point the iron away from the clothes and hold the trigger until the dribble turns to steam. Do not fill past the maximum mark.
When to stop. Water from the body of the iron, or from the soleplate while it is cold and unplugged, points to a cracked tank. Which? says a hole in the tank can be caused by putting a corrosive liquid such as vinegar or scented disinfectant in it. Contact the maker, and expect it to be outside the guarantee if an additive caused it.
4. Spitting water and flakes
Cause. Spitting is a leak with scale behind it. Flakes of limescale break loose in the steam chamber, partly block the holes, and water is thrown out with the steam.
Fix. Run the self-clean or anti-calc function over a sink at maximum heat, repeat until the water runs clear, then steam over an old towel for a minute. In a hard-water area, the models in our best iron for hard water guide have removable scale collectors or filters that make this easier.
When to stop. If spitting continues after two or three full descaling cycles, follow Philips’ advice for any persistent water fault: contact the maker.
5. Brown or rusty water
Cause. Morphy Richards’ support page says brown or rusty-looking water is limescale mixing with impurities inside the iron, that the iron is “not broken”, and that it is a normal effect of scale build-up. Tefal’s manuals say brown streaks also come from chemical descalers or additives in the water, and tell owners never to add anything to the tank.
Fix. Empty the tank and refill with the water your manual specifies: Morphy Richards’ advice differs by model, with some manuals calling for a 50/50 mix of tap and distilled water and others for distilled or filtered water only, so check yours. Then run the self-clean or descaling routine in the manual until the water runs clear, and steam onto an old towel for a minute to flush the last of the residue.
When to stop. If brown water persists after repeated clean cycles, or a generator sheds rust-coloured flakes from the boiler, ask the manufacturer. Morphy Richards states that scale discolouration is not a defect, so do not expect it to be treated as a guarantee claim.
6. White chalky marks on dark clothes
Cause. White streaks and powder on dark fabric are scale particles carried out with the steam. Philips says white flakes during the very first use are normal and stop shortly. After that, flakes mean scale in the soleplate, or that perfumed water or a descaling solution has been used.
Fix. Let the marks dry, then brush or shake them off; Philips’ advice is not to rub them with a wet cloth. Wash the garment, then descale the iron and rinse the tank. Stop using scented ironing water: Philips says it damages the device.
When to stop. Flakes that persist after descaling suggest the steam chamber coating is breaking up, which is a service job.
7. Shiny patches or scorch marks on clothes
Cause. A shiny patch is fibres flattened by heat and pressure; a scorch is fibres starting to burn. Both come from too much heat for the fabric, or from pressing over seams and pockets. Philips states that a shine or imprint from ironing over a seam “is not permanent and will come off after washing the garment”.
Fix the garment. For light scorch on cotton or linen, Philips suggests dabbing the area with white vinegar on a cloth, leaving it 15 to 20 minutes, then rinsing in cold water and washing. For shine on wool and suiting, lay a damp cotton cloth over the patch, hover the iron just above it with steam without pressing, then brush the nap up.
Fix the iron. Match the dial to the care label: one dot for synthetics, two for wool and silk, three for cotton and linen. Use a pressing cloth on dark trousers and over seams.
When to stop. If the iron scorches at a low setting, the thermostat is running hot. That is a safety fault: stop using it and contact the manufacturer.
8. Sticking or dragging across the fabric
Cause. An iron that drags has something on the soleplate: melted synthetic, spray starch, dye from a cheap towel, or a film of scale.
Fix. Unplug the iron and let it cool. Wipe the soleplate with a damp cloth and a drop of washing-up liquid, and clear the steam holes with a cotton bud. For baked-on residue, follow our guide to removing sticky residue from an iron. Philips advises against scouring pads, vinegar or other chemicals on the soleplate, and against hard contact with metal objects.
When to stop. If the non-stick coating is flaking or peeling, cleaning will not help and loose coating marks clothes. That is a replacement, or a guarantee claim if the iron is new.
9. Burning smell or smoke on first use
Normal. Tefal’s manuals say that on first use “a harmless odour and smoke may be given off” and that it disappears quickly. Philips says parts greased during production can cause some smoke the first few times. Morphy Richards says a faint smell from a new iron is normal and fades after a few uses. The routine is the same for all three: heat the iron to maximum and steam over an old towel, away from your clothes, for a few minutes.
Not normal. A hot-plastic or acrid electrical smell is not residue burning off. Morphy Richards’ advice is clear: if smoke continues or the smell is electrical, unplug the iron and contact them.
When to stop. Unplug at the wall if smoke comes from anywhere but the steam holes, if the plug or cord is warm or discoloured, or if the smell is electrical, and do not use it again.
10. Repair or replace?
Descale first. Which? found that 54% of owners never maintain their iron, and limescale sits behind most steam and spitting faults. A descaling cycle costs nothing and clears most problems on this page.
Check the guarantee. Tefal’s UK guarantee is 2 years across its range for domestic use. Philips irons and generators normally carry 2 years. Russell Hobbs gives 2 years as standard, plus an extra year if you register the iron online within 28 days of purchase. Makers typically exclude scale damage from the guarantee; Morphy Richards says scale discolouration is not a defect.
What is worth repairing. Which?’s view is that a failed element is a professional repair, that a basic iron is better replaced, and that a pricier model may be worth repairing.
Typical lifespan. Which? publishes no single lifespan figure, but its research gives a picture. Its 2019 survey found that more than 20% of members had a fault with their steam iron in the first six years, and that over a quarter of irons from one big brand developed faults in the first few years. Its annual owners’ survey, which feeds the reliability ratings behind its Eco Buy label, finds fault rates vary widely by brand; the brand-by-brand table is for Which? members only. Dropping is the other big killer: 61% of owners reporting accidental damage had dropped the iron. On those numbers, five years or more is a reasonable expectation with regular descaling.
If you replace it, our best steam irons guide and the hard-water irons page cover models that are easier to keep scale-free.
Frequently asked questions
Why is my steam iron not steaming?
Usually because the soleplate is not hot enough: set the dial to two dots or above and wait for the light to go out. If that does not help, scale is the likely cause: follow the descaling steps under fault 1 above.
Why does my iron leak water when steaming?
Philips and Tefal point to steam being used before the iron is hot, the boost being pressed too often, or an overfilled tank. Wait for the ready light and leave a few seconds between boosts.
Why is my iron light flashing and not heating?
It has gone into auto shut-off. Philips and Russell Hobbs irons switch off after about 30 seconds lying flat or 8 minutes on the heel. Lift the iron and stand it upright, and it reheats within a minute or two.
Is it normal for a new iron to smell?
Yes. Tefal, Philips and Morphy Richards all say a mild smell and a little smoke on the first few uses is manufacturing residue burning off. An electrical smell, or smoke from the body or cord, is not normal: unplug it and contact the maker.
Why is my iron spitting brown water?
Limescale inside the iron is mixing with residue and coming out with the steam. Morphy Richards says this is normal and not a defect. Run the self-clean cycle until the water is clear and never put descaler or vinegar in the tank unless the manual allows it.
How do I get shiny iron marks off trousers?
Lay a damp cotton cloth over the patch and hold the iron just above it with steam, without pressing, then brush the fibres up. Philips says a shine from ironing over a seam washes out. Melted synthetic fibres cannot be restored.
Can I put vinegar in my steam iron?
Not unless the manual says so. Which? warns that a corrosive liquid such as vinegar or scented disinfectant can eat a hole in the tank. Use the built-in self-clean function instead.
How long should a steam iron last?
Which?’s 2019 survey found more than 20% of members had a fault within the first six years, and its annual owners’ survey finds fault rates vary widely by brand. Five years or more is a reasonable expectation; descaling regularly and not dropping it extend its life most.
Related guides
- How to descale a steam iron
- How to remove sticky residue from an iron
- How to clean a steam generator iron
- Best iron for hard water
- Best steam irons UK
Sources: Which?, Common steam iron faults and how to fix them, survey of 5,884 owners, April 2024 (which.co.uk); Which?, Make 2019 the year you buy an iron that lasts, January 2019; Which?, Best steam irons, including its annual steam iron owners' reliability survey; brand-by-brand table for members only; Philips support: My Philips steam iron does not heat up anymore; My Philips steam iron is leaking from the soleplate; My Philips steam generator iron leaves a shine or imprint on the garment (philips.co.uk / philips.ie); Tefal UK warranty page (tefal.co.uk) and Tefal steam iron user manuals (first use and troubleshooting tables); Russell Hobbs steam iron user manuals (auto shut-off and troubleshooting); Russell Hobbs UK product registration: extra year of guarantee when registered within 28 days of purchase; Morphy Richards support: Why is my steam iron releasing brown water; My iron has a burning smell or smoke (support.morphyrichards.co.uk). How we research.
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