The Goodman GMH950703BXAC is a high-efficiency gas furnace with 95% AFUE rating, 70,000 BTU input capacity, multi-speed blower motor, hot surface ignitor, flame sensor, pressure switches, gas valve, control board, inducer motor, and heat exchanger. Designed for residential forced-air heating systems with standard 120V AC power supply. Below are key sections for safety, parts identification, replacement procedures, specifications, and troubleshooting.
Key components: Heat exchanger assembly, blower motor and wheel, inducer motor assembly, gas valve, hot surface ignitor, flame sensor, control board, pressure switches, limit switches, transformer, and door safety switch.
| Component | Description |
|---|---|
| Heat Exchanger | Primary and secondary stainless steel heat exchangers |
| Blower Assembly | Multi-speed motor with blower wheel and housing |
| Inducer Motor | Draft inducer assembly with pressure port |
| Gas Valve | 24V automatic gas valve with manual shutoff |
| Hot Surface Ignitor | Silicon carbide ignitor for gas ignition |
| Flame Sensor | Rod-type flame sensing device |
| Control Board | Integrated furnace controller with LED status lights |
| Pressure Switches | Draft proving switches for safety |
| Limit Switches | High temperature safety limits |
| Transformer | 120V to 24V step-down transformer |
Always disconnect power and gas supply before servicing.
WARNING! Failure to disconnect power and gas can cause electric shock, fire, or explosion. Only qualified technicians should perform repairs.
Major components and their locations within the furnace cabinet.
CAUTION! Document wire connections and component positions before disassembly.
General steps for common part replacements. Always reference specific part instructions.
Hot Surface Ignitor: Disconnect power, remove wires, remove mounting screws, install new ignitor, reconnect wires.
Flame Sensor: Remove single mounting screw, pull sensor out, clean or replace, reinstall.
Control Board: Document all wire connections, remove mounting screws, transfer wires to new board, secure board.
Gas Valve: Shut off gas, disconnect wiring and gas lines, remove mounting hardware, install new valve with proper sealant.
Control board, transformer, motors, switches, and safety devices.
Tip: Always verify voltage with meter before assuming component failure.
Gas valve, burners, manifold, and related safety devices.
WARNING! Always check for gas leaks with soap solution after any gas work.
Blower motor, wheel, housing, and mounting system.
CAUTION! Ensure proper rotation direction and airflow after reassembly.
Annual maintenance recommended for optimal performance.
Goodman provides limited warranties on furnace components. Heat exchanger: Limited lifetime warranty. Functional parts: 10-year limited warranty. Labor: 1-year limited warranty from date of installation. Original purchaser must register product for full warranty coverage. For warranty claims, contact authorized Goodman dealer or 1-877-466-8626.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Furnace won't start | Power, thermostat, door switch | Check circuit breaker, thermostat settings, door switch engagement |
| No heat | Ignitor, gas valve, flame sensor | Test ignitor for continuity, check gas valve operation, clean flame sensor |
| Blower won't run | Motor, capacitor, control board | Check motor windings, test capacitor, verify control board output |
| Short cycling | Filter, limit switch, airflow | Replace dirty filter, check limit switch, verify proper airflow |
| Lockout code | Safety device, flame sense | Reset power, check error code, verify flame signal |
Reset Procedure: Turn power off for 30 seconds, then restore power.
Technical Support: 1-877-466-8626; www.goodmanmfg.com