Appliance Spares
Quick answer: Bosch and Siemens induction cooktops share one code system. E2 means a cooking zone overheated (usually an empty pan), E5 and E6 are supply voltage or power board faults, U400 means the cooktop is wired to the wrong voltage, ER03 means a key is being pressed continuously (liquid or a pan on the controls), and ER47 is a communication fault between the controls and the induction module. A flashing pan symbol is not an error: no suitable pan was detected. Switch off at the isolator for a minute; a code that returns needs the module.
Not sure which one fits? Match your model number or check the sticker inside the door.
Every brand’s error codes in one index · Find your exact part
Last updated September 2026
A Bosch induction cooktop protects itself constantly. It watches the temperature of every coil, the mains voltage, the touch controls and the link between the control panel and the induction generators, and when any of those goes out of range it stops and shows a code. The same electronics sit under Siemens, Neff and Gaggenau glass, so the codes are shared across the group.
This guide decodes the codes shown on the PUE, PUJ, PIE, PIJ, PVS, PXE and PXV series cooktops sold in Australia, and the Siemens EH, EX and ED equivalents. For each code you get what it means, the usual cause and what to do. The good news: the two codes owners see most, E2 and ER03, are not faults at all but the cooktop reacting to an empty pan or a wet control panel.
Bosch induction cooktop error codes: quick-reference table
Codes are listed as they appear on the display. A symbol on its own (a flashing pan outline, a key, a padlock) is a status message, not a fault. Always confirm against your model’s manual before ordering a part.
| Code | What it means | Most likely cause | What to do / the part |
|---|---|---|---|
| E2 | A cooking zone has overheated | Empty or nearly empty pan left on a high setting, pan base badly warped, ventilation under the cooktop blocked | Remove the pan and let the zone cool; check the air gap under the cooktop is clear; if it repeats with a good pan on a normal setting the zone’s temperature sensor is suspect |
| E5 | Invalid mains voltage signal | Supply voltage out of range, loose connection at the terminal block | Switch off at the isolator for one minute; if it repeats, have the supply and the connection checked by an electrician |
| E6 | Power failure to the power board | Loss of one phase or a poor connection, power board fault | Check the isolator and the connection; a repeat with good supply is the induction power module |
| U400 | Cooktop connected to the wrong voltage | Wired between phases at 400 V instead of 230 V to neutral | Switch off at the isolator immediately and have the installation corrected by an electrician; do not keep switching it on |
| ER03 | A key is being pressed continuously | Water, steam condensation or a pan sitting on the control area | Dry and clear the control panel; the cooktop resumes when the key releases |
| ER20 / ER21 | Electronics overheated (ER21) or software fault (ER20) | Cooling fan blocked, hot air trapped under the cooktop, oven below running hot | Let it cool; check the ventilation gap and the cooling fan; a repeat is the control module |
| ER22 | Control panel fault: keys not reading correctly | Panel wet, dirty or failed | Clean and dry the panel; switch off at the isolator; replace the touch control if it repeats |
| ER31 / ER36 | Configuration (ER31) or sensor fault (ER36) in the module | Module not matched to the cooktop, temperature sensor on a coil | Service repair: the module needs programming or the coil sensor replacing |
| ER47 | Communication fault between the control panel and the induction module | Loose ribbon cable, moisture, module failure | Switch off at the isolator for a minute; if it returns the connection or the module needs service |
| Flashing pan symbol / ‘u’ | No suitable pan detected on the zone | Pan not magnetic, too small for the zone, or off-centre | Use a pan a magnet sticks to, sized to the zone ring, placed centrally |
| Key or padlock symbol | Child lock or cleaning lock active | Lock switched on, often by accident when wiping | Hold the lock key for about four seconds |
| ‘H’ or ‘h’ on a zone | Residual heat indicator | Zone still hot after cooking | Not a fault; wait for it to clear |
| ‘F’ or ‘F2’ on a zone (some models) | Zone overheating or pan too hot | Empty pan or oil overheating | Remove the pan and let the zone cool |
Which codes are not faults at all
Three of the things a Bosch induction cooktop shows most often are not errors. The flashing pan symbol means the zone cannot find a pan: the base is not magnetic (aluminium, copper, some stainless), the pan is smaller than the zone, or it is off-centre. The key or padlock is the child lock, switched on by accident while wiping. ER03 is a key held down, almost always by a splash of water or a pan edge over the controls. Dry the glass and all three go away.
E2 and ER21: heat
E2 means a coil’s temperature sensor saw a zone hotter than it should be. The commonest cause is a pan boiled dry or oil left heating in an empty pan; the next is a badly warped base that concentrates heat in the middle. Let the zone cool and it clears. If E2 keeps appearing with a good pan at a moderate setting, the sensor under that zone is drifting. ER21 is the electronics themselves overheating, which points at the cooling fan under the cooktop or a blocked ventilation gap, especially when an oven is installed directly below.
E5, E6 and U400: the electrical supply
Induction cooktops are sensitive to their supply. E5 and E6 report voltage or power board problems and often trace back to a loose terminal or a lost phase on a hard-wired installation. U400 is different and serious: the cooktop has detected 400 volts, which means it has been wired between two phases instead of phase to neutral. Switch off at the isolator and have the installation corrected before using it again. None of these are DIY: the connection work is for a licensed electrician.
Bosch induction cooktop parts in stock in Sydney
These are the parts behind the codes above that we hold in stock and ship Australia-wide. Match the model number on your model sticker before ordering, or run it through the Part Finder and let it match for you. Every part we hold for the brand is listed on the Bosch parts page, and by model on the model pages; the wider range is in the induction cooktop parts store.
- DAMANI Cooktop INFINITE CONTROL SWITCH suits DCC64WSS 0303
- Linea Cooktop Infinite Control Switch Energy Regulator, L11SS, 0303
- TECHNIKA BELLISSIMO OVEN/COOKTOP KNOB REPLACEMENT PACK OF 4 0716
- TECHNIKA BELLISSIMO OVEN/COOKTOP KNOB REPLACEMENT PACK OF 4 0716
- Single Energy Regulator Switch MP101 Genuine For Cooktops Fisher Paykel
Is it safe to fix an error code yourself?
Most of the codes above are cleared with a filter clean, a hose check or a plug-in part swap, and those are ordinary DIY jobs: unplug the machine, photograph the wiring before you unplug anything, and never bypass a door lock or a thermal cut-out. Anything involving the sealed refrigerant circuit, gas, or a mains-side repair belongs with a licensed repairer.
Frequently asked questions
How do I reset a Bosch induction cooktop error code?
Switch the cooktop off at its own control, then off at the isolator or circuit breaker for one minute, then back on. E2 and ER03 clear once the zone has cooled or the panel is dry. A code that returns straight away needs the module or the supply checked.
What does E2 mean on a Bosch induction cooktop?
A cooking zone overheated, usually because a pan boiled dry or was left empty on a high setting. Remove the pan and let the zone cool. If it repeats with a good pan on a moderate setting, the zone sensor is suspect.
What is ER03 on a Bosch or Siemens induction hob?
A key is being pressed continuously. Water, condensation or a pan on the control area is the usual cause. Dry and clear the panel and the cooktop resumes.
What does U400 mean?
The cooktop is connected to 400 volts, wired between two phases instead of phase to neutral. Switch off at the isolator and have an electrician correct the installation before using it.
Why does my Bosch induction cooktop flash a pan symbol?
No suitable pan was detected on that zone: the base is not magnetic, the pan is too small for the zone, or it is off-centre. A magnet should stick firmly to the base.
Where is the model number on a Bosch induction cooktop?
On the sticker on the underside of the cooktop or on the rating label supplied with the manual; some models show it on the packaging label kept by the installer. The E-number (for example PUE611BB5E) is what matches parts.
Read the code, then fit the part
Dry the glass, use a magnetic pan, let the zone cool. If a code stays after a minute off at the isolator, it is the module or the supply, and the supply is a job for an electrician. Find your Bosch part now
