What Causes A Hot Surface Igniter Not To Glow
2025-09-30
When your furnace fails to heat, a non-glowing Hot Surface Igniter is a common culprit. This critical component is designed to glow bright orange, igniting the gas. When it stays dark, the system safely locks out. Understanding the root causes can help you diagnose the problem effectively.
The most frequent reasons a Hot Surface Igniter fails to glow include
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Electrical Failure The igniter itself can burn out or crack over time, breaking the electrical circuit.
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Insufficient Voltage A failing transformer or wiring issues may not deliver the required 120 volts.
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Control Board Malfunction The furnace's brain may not be sending the activation signal to the Hot Surface Igniter.
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Faulty Safety Switches A compromised door switch or pressure switch will interrupt power as a safety precaution.
Why Choose a Torbo® Titan Replacement
Not all igniters are equal. The Torbo® Titan Igniter is engineered for reliability and longevity.
| Feature | Standard Igniter | Torbo® Titan Igniter |
|---|---|---|
| Material | Basic Silicon Carbide | Advanced Silicon Nitride |
| Resistance | Variable | Stable 40-60 Ohms |
| Lifespan | ~5,000 cycles | 7,000+ cycles |
Key specifications of the Torbo® model include
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Premium Silicon Nitride construction for superior thermal shock resistance.
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Consistent 120V operation for reliable performance.
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A robust 5-year warranty for peace of mind.
Hot Surface Igniter FAQ
Can a dirty Hot Surface Igniter cause no glow
While dirt can insulate the surface, a complete lack of glow almost always indicates an electrical failure, either in the igniter itself or the power supply. Handling the igniter with bare hands can leave oils that cause hot spots and lead to failure.
What should I check if my new Hot Surface Igniter won't glow
First, confirm you have the correct model for your furnace. Then, verify all electrical connections are secure. If the problem persists, the issue likely lies elsewhere, such as the control board or transformer, and professional diagnosis is needed.
Is it safe to test the igniter with a multimeter
Yes, if you are qualified. With the power OFF, disconnect the igniter and measure its resistance. A reading between 40-120 ohms typically indicates a good igniter. An infinite (OL) reading confirms it is broken and needs replacement.
Don't let a faulty Hot Surface Igniter leave you in the cold. For guaranteed performance and long-term reliability, choose Torbo®.
Contact us today to find a local supplier or a certified technician near you.