Blog

The Arcoaire furnace line includes models with standing pilot lights and others that use modern electronic ignition. Understanding whether your unit uses a pilot light, and how to safely relight or troubleshoot it, can save time and reduce frustration during cold months. This guide explains how to identify your Arcoaire furnace type, recognize common problems, and perform relighting and maintenance tasks safely. It emphasizes safety precautions, proper diagnosis, and knowing when to call a professional to avoid gas-related hazards.

What Is a Pilot Light on an Arcoaire Furnace?

A pilot light is a small, continuous flame that ignites the main gas burner when heat is needed. On older Arcoaire models, the pilot is kept lit by a thermocouple that signals the gas valve to stay open. A healthy pilot flame is typically blue and steady, indicating proper combustion. If the flame is weak, flickers, or turns yellow, it may indicate a dirty burner, low gas pressure, or a dirty thermocouple. Some Arcoaire furnaces use an electronic ignition instead of a standing pilot; in those units, there is no continually burning pilot flame, and a spark or hot surface ignition starts the burner when the thermostat calls for heat.

Is Your Arcoaire Model Equipped With a Pilot Light or Electronic Ignition?

Identifying your unit’s ignition type is essential before attempting any relighting. Look for a small continuous flame located near the burner for a standing pilot. If you see only a spark or an igniter light when heat is needed, or you don’t see a small flame continuously burning, the furnace uses an electronic ignition. Owners manuals, service labels on the furnace, or the model number can confirm ignition type. If your model uses electronic ignition, relighting steps for a standing pilot do not apply and diagnostics focus on the igniter, flame sensor, control board, and gas valve.

Signs of Pilot Light Problems

• Pilot flame extinguishes frequently with attempts to reignite
• Flame is yellow, orange, or flickers instead of a steady blue
• Gas odor around the furnace or venting area
• Frequent furnace cycling or burner not staying on
• Abnormal noises or soot around the burner

These indicators suggest potential issues such as dirty components, misaligned thermocouples, restricted vents, or gas supply problems. Never ignore a gas odor; evacuate the area and call the gas utility or emergency services if a strong gas smell is present.

Safety Precautions Before Servicing a Pilot Light

• Turn the thermostat to OFF and set the furnace switch to OFF if present.
• Ensure the area is well-ventilated and free of flammable materials.
• Do not operate the furnace if you smell gas or hear a hissing sound; leave the area and contact the gas company or emergency services.
• Shut off the gas supply at the exterior valve if you can safely access it.
• Keep a fire extinguisher accessible and never rely on improvised tools near flames.
• If you are unsure about any step, contact a professional technician.

How To Relight An Arcoaire Pilot Light

1. Turn the thermostat to OFF and rotate the gas control knob to OFF or PILOT depending on your model; wait 5–10 minutes to clear any accumulated gas.
2. Remove the furnace access panel to locate the pilot assembly and gas valve; ensure all power to the furnace is off.
3. If your model has a PILOT setting, turn the knob to PILOT; if it uses electronic ignition, skip to the next section for ignition-related checks.
4. Hold the reset or gas control knob in the PILOT position and apply a flame at the pilot or use the built-in igniter, depending on the model. Some units require lighting with a long match or using an igniter for several seconds.
5. Continue holding the knob in the PILOT position for 30–60 seconds after the flame lights, then slowly release the knob and observe a stable, blue flame.
6. Replace the access panel and switch the gas valve back to ON; restore power at the furnace and set the thermostat to HEAT. If the burner lights, the system should cycle normally.
7. If the flame goes out after relief of the control knob, inspect for thermocouple misalignment or a dirty thermocouple and clean or reposition as needed. If misalignment persists, do not force the system—seek a professional.
8. If the pilot fails to light, does not stay lit, or repeatedly goes out, discontinue attempts and contact a licensed technician. Repeated relighting attempts can cause gas buildup and pose safety risks.

Troubleshooting Common Issues with Arcoaire Pilot Lights

Maintenance Tips to Prevent Pilot Light Problems

• Schedule an annual furnace inspection and cleaning by a qualified technician
• Replace air filters every 1–3 months to maintain proper airflow
• Keep the area around the furnace clear of dust, debris, and clutter
• Inspect venting for blockages or proper venting to prevent backdrafts
• Clean or have a professional clean the pilot assembly and thermocouple as part of routine service
• Check for corrosion or wear on the gas valve and connections

When to Call a Professional

If the furnace uses a standing pilot and relighting attempts fail after following the steps above, or if you notice recurring flameouts, a persistent gas smell, or any signs of carbon monoxide, stop and contact a licensed HVAC technician. For units with electronic ignition, rely on a professional if the igniter, flame sensor, or control board show fault codes or fail to ignite the burner after reset. Regular maintenance by a qualified technician helps ensure safe operation and optimal efficiency for Arcoaire furnaces.

Energy Efficiency and Safety Considerations

Proper ignition and a stable, blue pilot flame contribute to efficient fuel use and cleaner combustion. A faulty flame can lead to higher gas consumption and increased CO risk. Maintain carbon monoxide detectors in the home and ensure adequate ventilation of the furnace room. Keeping filters clean, ducts unblocked, and the furnace well maintained supports better efficiency and safety for Arcoaire systems.