Nordyne Furnace Manual Troubleshooting

The Nordyne Furnace is a high-efficiency heating system designed for residential use, featuring advanced safety controls, multiple heating stages, and energy-saving operation modes. This troubleshooting guide covers common issues, diagnostic procedures, safety precautions, and maintenance tips to help resolve furnace problems efficiently and safely.

1. Safety Precautions 2. Common Symptoms & Solutions 3. Error Code Diagnostics 4. Component Testing 5. Maintenance Procedures 6. Reset Procedures 7. Professional Service 8. Warranty Information

Safety Precautions

Before attempting any troubleshooting, ensure proper safety measures are followed to prevent injury or damage to the furnace.

Precaution	Description
Power Disconnect	Turn off electrical power at circuit breaker before servicing
Gas Valve Shutoff	Close main gas supply valve before working on gas components
Carbon Monoxide	Install CO detectors; never operate furnace in enclosed space
Hot Surfaces	Allow furnace to cool before touching internal components
Proper Venting	Ensure exhaust and intake pipes are clear and unobstructed
Clearance	Maintain minimum clearances from combustible materials

Common Symptoms & Solutions

Identify and resolve frequent furnace issues with these diagnostic steps.

Furnace won't start: Check thermostat setting, circuit breaker, and door safety switch.
No heat production: Verify gas supply, pilot light (if applicable), and igniter operation.
Short cycling: Inspect air filter, flame sensor, and limit switches.
Blower runs continuously: Check thermostat fan setting and control board operation.
Unusual noises: Examine blower wheel, motor bearings, and heat exchanger for issues.

WARNING! Gas-related issues should be handled by qualified technicians only.

Error Code Diagnostics

Nordyne furnaces display error codes via LED flash patterns to indicate specific issues.

1 Flash: Ignition lockout - Check gas supply, pressure, and igniter
2 Flashes: Pressure switch stuck open - Verify venting and switch operation
3 Flashes: Pressure switch stuck closed - Inspect tubing and switch mechanism
4 Flashes: Rollout switch open - Check for blocked heat exchanger or flue
5 Flashes: Flame sensed with gas valve off - Replace gas valve or control board
6 Flashes: Limit circuit fault - Verify airflow and clean filters
7 Flashes: Blower fault after 90 seconds - Check blower motor and capacitor

Component Testing

Systematic testing of furnace components to identify faulty parts.

Thermostat: Check for 24VAC between R and W terminals; verify temperature calibration.

Pressure Switch: Use multimeter to confirm continuity when inducer motor runs.

Flame Sensor: Clean with emery cloth; test for microamp output during operation.

Igniter: Visual inspection for cracks; resistance should be 40-90 ohms.

Gas Valve: Verify 24VAC to valve terminals; check manifold pressure (3.5" WC natural gas).

Maintenance Procedures

Regular maintenance prevents common issues and extends furnace lifespan.

Monthly: Check and replace air filter if dirty.
Seasonal: Clean flame sensor and inspect heat exchanger.
Annual: Professional inspection of burners, heat exchanger, and vent system.
Biannual: Lubricate blower motor (if required) and check electrical connections.

Tip: Keep area around furnace clean and free of combustible materials.

Reset Procedures

Various reset methods for different furnace conditions.

Power reset: Turn off power at breaker for 30 seconds, then restore.
Manual reset: Press reset button on rollout switches (if tripped).
Control board reset: Remove thermostat R wire for 30 seconds, then reconnect.
Lockout reset: Power cycle furnace to clear ignition lockout error codes.

CAUTION! Multiple lockouts indicate serious issues requiring professional service.

Professional Service

When to contact a qualified HVAC technician for furnace repair.

Situation	Action Required
Gas odor detected	Evacuate immediately; call gas company and technician
Carbon monoxide alarm	Evacuate; call emergency services and HVAC professional
Heat exchanger damage	Immediate professional replacement required
Gas valve replacement	Licensed technician only due to gas handling
Control board failure	Professional diagnosis and replacement

Warranty Information

Nordyne furnaces include limited warranties covering various components and labor.

Heat Exchanger: 20-year limited warranty
Parts: 5-year limited warranty from installation date
Labor: 1-year limited warranty through installing dealer
Registration: Complete warranty registration within 90 days of installation

For warranty claims and service: Contact Nordyne at 1-800-422-4328 or visit www.nordyne.com