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Coffee-machine maintenance illustration for Sage BES450 / Sage BES870: Machine switches on then ceases to operate
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Sage BES450 / Sage BES870: Machine switches on then ceases to operate

The safety thermal cut-out may have opened after the pump, and on BES870 the grinder, overheated. Switch off using the model’s normal control, unplug and leave the machine untouched for 30–60 minutes; if it stops again after one restart, contact Sage.

Manufacturer sources consulted

Models covered

Sage BES450 / Sage BES870 — Machine switches on then ceases to operate. Preserve the exact display, drink and timing, then perform the official check once.

Before checking Sage Coffee machine

  • Keep hands away from hot water, steam, the grinder and moving brew parts. Switch off and unplug before removing a user-removable part; never open the housing, boiler, pump or grinder.

What this symptom can mean on Sage Coffee machine

What this exact symptom meansThe safety thermal cut-out may have opened after the pump, and on BES870 the grinder, overheated.
Keep neighbouring faults separateThis guide is limited to “Machine switches on then ceases to operate”; a leak near electricity, a dry pump, uncontrolled steam or a different display requires its own path.

4 checks for Sage Coffee machine, starting with Capture the starting point

  1. Capture the starting point

    Photograph or note “Machine switches on then ceases to operate”, the selected drink and what happened immediately before it.

  2. Make the machine safe

    Keep hands away from hot water, steam, the grinder and moving brew parts. Switch off and unplug before removing a user-removable part; never open the housing, boiler, pump or grinder.

  3. Follow the manufacturer check

    Switch off using the model’s normal control, unplug and leave the machine untouched for 30–60 minutes; if it stops again after one restart, contact Sage.

  4. Retest once and decide

    If the exact symptom clears, observe one normal drink. If it returns, preserve the evidence and contact authorised support instead of repeating resets or guessing a part.

When to stop checking Sage Coffee machine

  • Stop immediately for a hot plug, damaged cable, burning smell, smoke, water near electrical parts, uncontrolled steam, a dry-running pump, a part moving under pressure or the exact fault returning after one documented test.

Next step

Choose the next step for Sage Coffee machine

For “Sage BES450 / Sage BES870: Machine switches on then ceases to operate”, base the decision on the documented sequence beginning with “Capture the starting point”, not on the warning or symptom alone.

Start with Capture the starting point

Work through all 4 checks for Sage Coffee machine. If normal operation returns and no warning sign remains, the diagnosis ends without ordering a part.

Stop the Sage Coffee machine check at a warning sign

Use the stop conditions above for “Sage BES450 / Sage BES870: Machine switches on then ceases to operate”. A qualified diagnosis should come before replacing the appliance whenever repair safety or feasibility is uncertain.

Sources used

  • Sage — Sage's official manual or model page documents “Machine switches on then ceases to operate” and the bounded user procedure retained here.
  • Sage — Sage's official manual or model page documents “Machine switches on then ceases to operate” and the bounded user procedure retained here.
  • Sage — Sage's official manual or model page documents “Machine switches on then ceases to operate” and the bounded user procedure retained here.
  • Sage — Sage's official manual or model page documents “Machine switches on then ceases to operate” and the bounded user procedure retained here.

Last checked: 30 August 2026