HVAC Cary NC

Responded to a gas odor complaint and red-tagged gas supply on a 7-year-old system; the gas regulator was diagnosed as out of adjustment rather than failed, and outlet gas pressure was set to specification, verified with a digital manometer, and the burners were confirmed firing properly. Heavy corrosion was noted on the exterior gas piping and fittings at the outdoor unit and should be monitored or replaced, and the reported bedroom airflow concern was noted for further evaluation.

Performed seasonal tune-ups on two heating and cooling systems (11–15 years old), including inspection of the Trane thermostat and Aprilaire humidifier controls to confirm proper operation and settings. Measured supply-side temperatures with a digital thermometer, noting moisture on the foil-faced duct surfaces, and verified both systems were operating normally with no reported issues.

Responded to a no-heat complaint on a recently installed system, with the Lennox smart thermostat displaying Error Code 320 (Relay Control Problem). Inspected the outdoor condensing unit's low-voltage terminal strip (C, R, W, O/B, Y2, Y) and high-voltage connections (L1, L2, ground), confirming wiring was secured and no visible physical damage, corrosion, or frost was present. Documented the thermostat alert and unit data label, and coordinated with Lennox technical support for further diagnosis of the relay control fault.

Responded to a no-heat call where the system was running but delivering only cold air. Inspection of the heating components revealed heavy rust and corrosion on the burner tubes and associated metal ductwork/venting, which is consistent with a compromised heat exchanger/combustion assembly and is likely causing the loss of heat. The corrosion was documented with photos, and the system's condition was evaluated to determine the necessary repair or replacement recommendations.

Performed quality control inspection of the air handler control enclosure, verifying the main control board, relays, capacitors, terminal block connections, and low-voltage wiring routing through grommets were secure and free of damage, corrosion, or burn marks. Inspected the duct-mounted sensor installation in the crawlspace, confirming the mounting fitting was fastened to the supply duct and the sensor lead and connector were properly routed and supported, with no deficiencies noted.

Responded to a no-cool complaint on the second-floor system of a two-system home with 15-year-old equipment. Performed electrical diagnostics with a True RMS clamp meter to evaluate component amperage draw and inspected the insulated flex duct (R-8) in the crawl space to assess airflow distribution and the integrity of the supply runs.

Installed new insulated flexible ductwork in the crawl space, routing the black and foil-wrapped duct runs beneath the floor joists and connecting them to the plenum with taped and sealed joints. Terminated the supply runs at the vent boots and elbow fittings, then secured the ductwork and maintained clearance around the existing PVC piping. Verified the vapor barrier remained in place and the fiberglass batt insulation between the joists was left in position.

Performed a quality control inspection of the furnace and associated installation components. Verified the inducer blower assembly, wiring connections, and control system labeling were properly secured with no visible damage, corrosion, or ice buildup. Inspected the condensate drain piping with P-trap, primed PVC joints, insulated refrigerant line, and ductwork in the attic space, confirming proper support and installation.

Performed a second-opinion evaluation on a 17-year-old downstairs furnace reported to have a vibrating blower fan. Inspection revealed heavily corroded mounting hardware with a rusted post and a frayed, deteriorated strap, along with widespread surface corrosion on the mounting plate, and a borescope inspection of a brick-lined flue/drain opening showed debris, discoloration, and apparent cracking. Findings were documented with photos to support a repair quote.

Performed a complete heating and cooling maintenance on one system, including an 80-point inspection, outdoor coil cleaning, burner cleaning, gas pressure adjustment to manufacturer specifications, and safety inspections. Electrical diagnostics were conducted with a TRMS clamp meter to verify amperage draw and capacitor performance, confirming the system is operating within normal parameters.