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Larry LynnJul 28, 2025
What to do if my Siemens HB634GB 1I Oven does not heat up and "Demo mode is switched on" appears in the display?
- MMelissa BushJul 28, 2025
If your Siemens Oven isn't heating up and displays 'Demo mode is switched on', it's likely that the appliance is in demo mode. To resolve this, briefly disconnect the oven from the power supply by switching the circuit breaker in the fuse box off and back on again. Then, switch off demo mode within three minutes. Also, open and close the appliance door once after a power failure.