HVAC Refrigeration Guide — furnace lockout

Furnace Won't Ignite? How to Diagnose a Draft Inducer Failure

Aug 09, 2026

If a gas furnace won't start or locks out before the burners light, the draft inducer is one of the first components to check. This guide covers how to confirm an inducer failure — symptoms, voltage checks, and confirmed OEM replacement parts for York, Heat Controller, Modine, and more — before you order the wrong part.

Tags: blower motor, combustion air blower, draft inducer, Fasco A238, furnace diagnosis, furnace lockout, furnace won't ignite, Heat Controller, HVACR parts, inducer motor, Modine inducer, OEM replacement, pressure switch, S1-373-20830-001, York inducer

York HVAC Parts Field Guide

Jun 21, 2026

York parts field guide for HVAC techs — confirmed OEM replacements including the S1-6008081 condenser motor, S1-373-20830-001 inducer, and S1-THEC11NS thermostat, with diagnostic sequences and failure patterns.

Tags: Coleman, commercial HVAC, condenser fan motor, contactor, draft inducer, dual-run capacitor, Evcon, field guide, furnace lockout, HVAC diagnostics, HVAC technician, Johnson Controls, Luxaire, OEM replacement parts, pressure switch, residential HVAC, rooftop units, run capacitor, S1-373-20830-001, S1-6008081, S1-THEC11NS, Source 1, thermostat, York, York OEM parts