Identify both sides
For a split system, the outdoor unit, indoor coil, furnace or air handler, and controls can all affect the same symptom.
774-HVAC-PM0My HVAC PM A Carrier-branded furnace, AC, or heat pump still has to be diagnosed as an installed system. Record the symptom, operating mode, indoor and outdoor model information, and any visible control message before scheduling—or skip directly to service.
This is an HVAC PM planning and service page—not a manufacturer-operated website. Manufacturer references are linked below; installed ranges are HVAC PM estimates.
For a split system, the outdoor unit, indoor coil, furnace or air handler, and controls can all affect the same symptom.
A thermostat or board code is useful evidence, but operating sequence and measurements still determine the fault.
Model, serial, registration, failed component, and manufacturer approval determine whether a part is covered; diagnostic and labor remain separate unless the terms say otherwise.
You do not need to open a cabinet. Capture only what is visible and safe to reach.
Open the free System Check →Airflow, ignition, drain, control, electrical, refrigerant, and compressor-side problems require different tests and parts.
The model, revision, refrigerant, matched indoor equipment, and parts availability shape the repair scope.
Attic or tight access changes labor; a manufacturer-approved covered part may remove the part charge but does not automatically cover diagnosis or labor.
The first-hour diagnostic price covers the service call and troubleshooting—not an unknown repair. HVAC PM reviews the finding, warranty status, available options, and repair price before additional work proceeds.
No contact form is required to read these answers or use the System Check.
No. It covers the service call and first hour of troubleshooting. Any part, warranty handling, labor, and repair price are reviewed after the fault is identified.
No. Choose “Not Sure” and schedule, or add a clear label photo to the optional System Check handoff.
No. This is an HVAC PM planning and service page. Manufacturer references and warranty decisions remain with the applicable manufacturer resources and terms.
The System Check can return a broad result early, then narrow it with equipment, installation, venting, condensate, access, and optional photos.