Coil's HVAC AI rides along on the job. It has read every past visit, every unit on file,
and the warranty status, so the tech asks plain questions and gets answers grounded in this exact customer.
Reads the whole history. Past jobs, tech notes, refrigerant work, and equipment specs, in one answer.
Spots the pattern. "The downstairs unit is the older troublemaker" is the kind of read a 20-year vet makes.
Field-safe. Procedures stay phone-short, with an EPA and high-voltage warning when the work calls for it.
Service call, downstairs not cooling · MarcusUpcomingJ-1260
CoilPhotosEquipment 3Parts
Coil
I just arrived, give me a run down of this customer's service history
Here's the quick rundown:
Mar 28, 2026: Spring maintenance on both systems. Coils cleaned, charge checked, filters replaced, drains cleared. Downstairs 2007 XC14 noted as aging.
Aug 15, 2025: Downstairs wifi thermostat replaced and configured.
Jun 20, 2025: Upstairs XC20 low on charge. Found a leaking Schrader core; repaired and recharged to spec.
Nov 3, 2024: Fall maintenance on both systems. Upstairs capacitor slightly low but still acceptable.
Jul 12, 2024: Downstairs XC14 not cooling. Failed dual run capacitor replaced; cooling restored.
Pattern: the downstairs unit is the older troublemaker; upstairs has been solid since the leak repair.
AI-generated, always verify
Yeah the downstairs unit is acting up, you were right. What should I test or try to get it blowing cold?
Start with airflow, then the outdoor unit, then controls.
Set the thermostat to Cool, fan Auto, and temp 5° below room temp.
Check the filter and replace if dirty.
Make sure all supply registers are open and the return isn't blocked.
Confirm the indoor blower is running strong.
Go outside: see if the condenser fan and compressor start.
If the outdoor unit hums or clicks but won't run, test the capacitor and contactor.
If the line is iced up, shut it off and let it thaw.
If the fan runs but air stays warm, check subcooling/suction and look for a refrigerant issue.
That downstairs XC14 is old, so if the cap and airflow check out, you may be chasing a tired compressor or low charge.
Kill power at the disconnect and verify dead before touching wiring.
AI-generated, always verify
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