ER21 is a heat shutdown at the touch controls of a Bertazzoni cooktop. It clears when the temperature falls.
Model compatibility: Bertazzoni reuses codes across series and model years, so ER21 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
The sensor at the user interface of the cooktop detected more than 85 C (185 F), so the hob switched off.
ER21 explained
Touch controls on an induction cooktop are built into the glass, and a sensor watches that area, which the manuals call the user interface. Once the sensor reads over 85 C (185 F), the cooktop goes into protection mode, powers down fully and shows ER21. According to the manual, a hot object left on the interface is how this happens.
Two temperatures
Shutdown trigger: a reading over 85 C (185 F).
The code clears once the reading is under 75 C.
A different passage speaks of restarting under 85 C, whereas the troubleshooting table names 75 C. Aim for the lower figure.
What to do
Lift the hot pan or object off the controls.
Wait for the cooktop to cool; restarting on hot glass is not what the manuals describe.
Switch on again after the code has gone.
The second remedy
The table has a further remedy, a look at the thermal insulation under the user interface. The manual wants the appliance turned off or cut from mains power for that, with a qualified technician doing the service.
Related
ER03: a blocked control area, where the hob likewise switches off
E1: a glass plate sensor reading high on the P905 series hob
Does ER21 mean something is broken?
Not on its own. The manuals present it as a protection that releases as the temperature falls. If ER21 returns while nothing hot is near the controls, the table’s other remedy, a check of the user interface insulation, applies.
Cooktop repair and service in Los Angeles
Repeated ER21 shutdowns on a Bertazzoni cooktop can be reported on (310) 987-4514. Mention the model and whether anything hot sat by the controls. More on the cooktop repair page.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your Bertazzoni appliance?
Book a specialist visit for a clear estimate and approval before any repair.
