What it means

Bosch induction hob E9 means the touch control panel is sending invalid readings to the main board.
The hob can't trust the buttons, so it shuts the zones off until the panel is readable again.
By far the most common cause is something resting on the touch area — a wet cloth, a hot pan handle, a metal spoon — that the hob keeps registering as a permanent finger press.

Affected Models

Bosch Series 4/6/8 induction hobs with TouchSelect or DirectSelect controls
Bosch flexInduction hobs after a steam-heavy cooking session
Bosch combi-hobs where the touch panel is close to the cooking zones

Common Causes

Water, oil, or condensation pooled on the touch area
Object (cloth, lid, pan handle) resting across the touch sensors
Cracked glass over the touch area letting moisture into the sensors below
Touch board ribbon cable came loose internally
Failed touch sensor IC on the control board

How to Fix It

Wipe the panel dry.

Lift everything off the hob.
Use a dry microfibre cloth to clear water, oil film, or steam condensation from the entire glass surface — focus on the strip where the buttons live.
Don't use kitchen roll, which leaves fibres that the touch sensors also pick up.
Power-cycle the hob.

After the panel is dry and nothing is resting on it, switch off at the wall for 60 seconds.
Switch back on.
If E9 came from a pan handle leaning on the buttons or a wet cloth bridge, it should clear immediately.
If E9 returns within seconds of power-on, the cause is deeper than surface moisture.
Check for glass cracks.

Look closely at the glass directly over the touch buttons.
Even a hairline crack lets steam down to the sensor pads and triggers E9 every time the hob heats up.
Cracked glass over the touch zone needs a replacement glass top — the hob can't be used safely with the crack open.
Schedule a service if E9 persists.

If the panel is clean, dry, and crack-free but E9 still appears, the touch board has failed internally.
Replacement is a Bosch tech job — the board sits under the glass and access requires lifting the top.
Touch board replacement is typically £80-£180 fitted depending on the model.