A problem starting right after a firmware update, a new host pairing or a software install should be checked against that specific change before a full reset. For Apple Watch heart-rate and health sensors, first clean/dry the back, wear snugly and compare a supported resting measurement.
What this covers
- Apple Watch heart-rate and health sensors with this exact failure state
- Diagnosis across fit/skin and feature eligibility versus permission, motion and sensor hardware
What it does not cover
Try in this order
0 of 4 completedCapture the exact failure state
ReversibleNote the exact firmware version or newly paired host, and confirm the prior working state. Expected behavior: record eligible measurements through clean skin contact under supported conditions.
Isolate the component boundary
ReversibleClean/dry the back, wear snugly and compare a supported resting measurement. Test with the new pairing removed, or check for a known-issue note for the firmware version. Boundary to separate: fit/skin and feature eligibility versus permission, motion and sensor hardware.
Correct only the proven cause
ReversibleCorrect fit/permissions, update or service persistent sensor failure. Apply the vendor's fix for the update, or remove the conflicting extra pairing.
Verify and stop safely
ReversibleConfirm normal operation with the change present across at least one full session. Seek medical care for symptoms regardless of wearable readings.
Evidence ledger
Sources behind this answer
Exact questions