Direct answer
Prove thermostat demand, indoor airflow and outdoor-unit operation before considering refrigerant or electrical components.
What this covers
- Residential central air-conditioning and heat-pump systems in cooling mode
- The exact condition described in the title
- Customer-accessible checks before internal repair or reset
What it does not cover
- ×A different brand, model family or similar-looking code
- ×Internal live-electrical, gas, refrigerant or sealed-system testing
- ×A guarantee that a named component has failed without isolation
Capture the exact state
ReversibleRecord indoor/outdoor temperature, filter, blower and outdoor fan/compressor sound.
Separate the likely fault domains
ReversibleCheck power once, filter size/orientation, open registers and exterior debris with power off.
Correct only the proven, accessible condition
ReversibleRestore airflow or settings; arrange service for a silent/humming unit, ice, oil staining or warm supply air.
Verify once before going farther
ReversibleConfirm steady cool supply air and falling indoor temperature.
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 record first for “Air conditioner runs but does not cool the house”?+
Record indoor/outdoor temperature, filter, blower and outdoor fan/compressor sound.
Does the symptom or code prove a part has failed?+
No. Check power once, filter size/orientation, open registers and exterior debris with power off.
When should I stop troubleshooting?+
Stop for sparks, hot wiring, refrigerant-line damage, smoke or repeated breaker trips.
Answer for the exact device and software version shown above.