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. Preserve the exact display, drink and timing, then perform the official check once. 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. 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.
Models covered
Safety first
- 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 the symptom may indicate
Checks in the right order
- Capture the starting point
Photograph or note “Machine switches on then ceases to operate”, the selected drink and what happened immediately before it.
- 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.
- 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.
- 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.
Stop and get qualified help when
- 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
Repair, replace a part, or arrange a diagnosis?
Use the checks and stop conditions above to choose a cautious next step. A symptom alone never proves that the appliance has failed.
Resolve it without buying anything
Complete the 4 user-accessible checks in order. If normal operation returns and no warning sign remains, no replacement is indicated.
Replace only the confirmed part
If the checks isolate a worn or blocked component, match its complete reference to the exact appliance model before ordering.
This guide does not identify a replacement part. Do not order a generic component from the symptom alone.
Arrange a diagnosis before replacing the appliance
Stop at any warning sign listed above. A qualified diagnosis should confirm that repair is unsafe, unavailable or uneconomical before an appliance replacement is considered.
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