Why Your Induction Hob Detects the Wrong Pan Size
Quick answer: If your induction hob detects the wrong pan size, it’s usually because the magnetic base of the pan is smaller, uneven, or not fully compatible — not because the hob is faulty.
If your induction hob only heats part of a pan, struggles to detect it, or behaves inconsistently, it can seem like a fault. In reality, induction cooking relies on magnetic contact, meaning what the hob detects isn’t always what you see from above.
How Induction Hobs Detect Pan Size
Under each cooking zone are coils that create a magnetic field An invisible energy field that transfers heat directly into compatible cookware. . When a pan is placed on the hob, the appliance detects the magnetic material in the base and sends energy directly into that area.
This means the hob only heats the part of the pan it can “see” magnetically. If the base is smaller or uneven, the hob will behave accordingly.
Top Reasons Your Hob Detects the Wrong Size
The base is smaller than the top
Many pans widen towards the rim, so they look larger than the actual base. Induction only responds to the flat underside.
The magnetic layer is limited
Some “induction-compatible” pans only have a partial magnetic layer, meaning only part of the base heats properly.
The pan base is warped
A warped or bowed base reduces contact with the hob, leading to uneven detection and heating.
The pan is too small for the zone
Each cooking zone has a minimum detection size. If the pan is too small, the hob may not activate correctly.
Energy efficiency limits
Induction technology avoids wasting energy, so it may limit power if the pan isn’t suitable.
| Issue | What happens | Fix |
|---|---|---|
| Small base | Partial heating | Use wider flat-bottom pans |
| Weak magnetism | No detection | Upgrade cookware |
| Warped base | Uneven heat | Replace pan |
| Wrong zone size | Power cuts out | Match pan to zone |
Signs It’s a Cookware Problem
- One pan works perfectly while another doesn’t
- The hob flashes or shows a warning symbol
- Heat is concentrated in the centre only
- The zone turns on and off repeatedly
Does Pan Shape Affect Detection?
Yes — flat-bottomed cookware performs best. Uneven, ridged, or curved bases reduce contact and can confuse detection.
For best results, use cookware that fully covers the cooking zone and sits flat on the glass.
How to Fix Pan Detection Issues
- Use flat, induction-compatible cookware
- Check the base diameter (not the rim)
- Match pan size to the cooking zone
- Keep the hob surface clean
- Replace warped or damaged pans
Could It Be a Fault?
In rare cases, yes. If multiple pans fail across all zones, there may be an issue with the hob itself.
However, if at least one pan works correctly, your hob is almost certainly functioning as designed.
Choosing Better Cookware
To avoid detection issues:
- Look for a full magnetic base
- Choose heavier, well-built pans
- Avoid decorative or uneven undersides
- Check for induction compatibility labels
You can explore our induction hob range or read more advice on the CATA blog.
Final Thoughts
If your induction hob detects the wrong pan size, it’s usually because the usable base of the pan doesn’t match what you expect. Once you understand how induction works, it becomes much easier to get consistent, efficient results.
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