HVAC Refrigeration Guide — Heat Strip

Armstrong Furnace LED Flash Codes: Diagnose Before You Replace

Aug 02, 2026

Armstrong furnace flashing 2, 3, or 7? Count the LED before you open anything. This guide maps every flash code to its likely cause — pressure switch, inducer motor, or ignition electrode — and shows you how to confirm the right part before ordering.

Tags: 27X92, ALPKT516-4, Armstrong Furnace, Flash Codes, Furnace Fault Codes, Furnace Troubleshooting, Heat Strip, HVAC Repair, Ignition Lockout, Inducer Motor, LP Conversion, Pressure Switch, R100684-04, R101523-01, R45688-001

Carrier Fault Codes: Heat, Blower & Control Failures Explained

Jul 26, 2026

Carrier fault codes point to four failure points: heat strips, blower drivetrains, control/terminal boards, and metering devices. This guide breaks down the most common codes — including Code 33 high-limit trips, E3 blower faults, and communicating-board errors — and matches each symptom to the confirmed OEM Carrier part that fixes it.

Tags: Blower Motor, Carrier, Commercial HVAC, Electric Heat Kit, Fault Codes, Heat Strip, HVAC Diagnostics, OEM Parts, Residential HVAC, Terminal Board, Troubleshooting, TXV Valve