Direct answer
A wrong result requires checking inputs, mode, calibration and output separately; a working control path can still be configured for the wrong state. For connected smoke or carbon-monoxide alarm, first use the physical test button and inspect manufacture/expiry/power status.
What this covers
- connected smoke or carbon-monoxide alarm with this exact failure state
- Diagnosis across local alarm sensor/power versus network, notification and account
- Customer-accessible observation, settings and external components
What it does not cover
- ×A displayed manufacturer error code with a different documented meaning
- ×Live electrical, sealed-system, internal battery-cell or gas repair
- ×A claim that every model exposes identical controls
Capture the exact failure state
ReversibleWrite down the selected mode, input conditions and the exact unexpected output. Expected behavior: sound locally and report status without depending on the app for life safety.
Isolate the component boundary
ReversibleUse the physical test button and inspect manufacture/expiry/power status. Use a known reference input or manufacturer test and compare the result. Boundary to separate: local alarm sensor/power versus network, notification and account.
Correct only the proven cause
ReversibleReplace expired/failed alarm and correct app notification separately. Correct the setting, calibration or component proven by that comparison.
Verify and stop safely
ReversibleRepeat with the reference and a normal real-world case. Leave and call emergency services for any real smoke/CO alarm or symptoms.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check first when connected smoke or carbon-monoxide alarm has this problem?+
Use the physical test button and inspect manufacture/expiry/power status.
Why not factory-reset immediately?+
The useful boundary is local alarm sensor/power versus network, notification and account. A reset can erase state without proving which side failed.
When should I stop troubleshooting?+
leave and call emergency services for any real smoke/CO alarm or symptoms.
Answer for the exact device and software version shown above.