Carpet cleaner will not power on, display is blank, no indicator lights

Safety first: Unplug the Siemens carpet cleaner from the wall outlet before any inspection. Do not work on a live appliance.

• Check the outlet: Plug a lamp or another appliance into the same outlet to confirm it has power. Reset any tripped breaker or GFCI.
• Inspect the power cord: Look for cuts, kinks, burn marks, or crushed sections along the Siemens power cord. If you see damage, the cord set must be replaced; do not tape or splice it.
• Test the power switch: With the unit unplugged, remove the upper housing according to the user/service manual. Locate the main ON/OFF rocker or push-button switch. Use a multimeter in continuity mode to verify that the switch closes (0 Ω) when turned ON. Replace the switch if it does not change state.
• Check the line fuse / EMI filter: On many Siemens carpet cleaners, the line fuse is mounted on or near the EMI filter or main control PCB. Visually inspect the fuse; if the filament is broken or the glass is blackened, replace it with the exact same rating (amperage and type). If the new fuse blows immediately, disconnect and seek a technician—there may be a shorted motor or control board.
• Inspect the control board: Look for burnt components or tracks on the main PCB. If there is visible damage, the main control module should be replaced as a complete assembly.

If you are not comfortable opening the housing or working with mains components, contact a qualified Siemens service technician.