Question: What is a hot surface ignitor?

How do I know if my hot surface ignitor is bad?

Set the multimeter so it can properly measure a resistance of 10 to 200 ohms. Disconnect the hot surface ignitor from the control board and measure the resistance. A good hot surface ignitor will have a resistance of 40 to 90 ohms. Greater than 90 ohms indicates a failing or failed hot surface ignitor.

What causes hot surface ignitor failure?

High Voltage Applying 120 volts to that HSI will cause it break, and sometimes almost immediately. Having too low of voltage may not let the igniter burn hot enough. Once, in my early service years, I replaced a 240 ignitor for a package unit with a 120 ignitor.

How much does it cost to replace a hot surface ignitor?

Ignitor Replacement Cost An ignitor replacement costs $150 to $250 unless it happens in the middle of the night. After hours or emergency service fees can raise that to $300 to $500. This part fails more than any other. Regular maintenance keeps it clean and working longer.

How do you know if your ignitor is bad?

4 Signs of a Faulty Furnace Ignitor The Furnace Stops Running. When a furnace won’t run at all, check for a bad ignitor. Your Furnace Blows Chilly Air. Unless you’ve set your thermostat to COOL, your furnace should not blow cold air. Does Your Furnace Short Cycle? Now here’s a tricky sign indeed. A No Glow Ignitor. We Can Replace Your Furnace Ignitor.

Can you clean a hot surface ignitor?

It is not necessary to clean a hot surface igniter as it blow off any dust. However contrary to silicon carbide ceramic hot surface ignitor which are very brittle and shouldn’t be touched, silicon nitride hot surface ignitor are very robust and can be cleaned manually iff really necessary.

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How does a hot surface igniter work?

The hot surface ignitor (HSI) is the most commonly used electronic ignition system. It works like a light bulb filament, heating up when electricity is passed through it. Most are made from silicon nitride or silicon carbide. Then the gas valve opens, and the burner gas is ignited by the HSI.

Can you repair a hot surface ignitor?

Replacing the hot surface ignitor is simple. The key, again, is to be careful because of how fragile these can be. I don’t mean to dumb it down, but you just take out a screw, remove the part, and undo the clip. That’s it.

What is a hot surface ignitor made of?

Hot Surface Igniter Configuration The two composition materials generally associated with hot surface igniters are silicon carbide and silicon nitride. Silicon carbide is a compound of carbon and silicon and is characterized by a low density and oxidation resistance.

How much does an ignitor cost?

An ignitor typically costs between $30 and $50.

How much does an ignitor for a furnace cost?

Average Cost of Furnace Ignitor Replacement Homeowners typically pay between $120 to $225 to have the ignitor replaced on their furnace. If the unit is still under warranty, you’ll only pay for labor which runs around 2 hours total and cost around $150.

How long does furnace ignitor last?

Don’t worry—an ignitor that goes bad is common for most furnaces. Fortunately, you can replace the ignitor without replacing the full furnace. Most ignitors last about seven years. Keep reading to learn how you can tell if your furnace problem is a faulty ignitor.

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How do you test Ignitor?

Test The Ignitor With A Multimeter Set a multimeter to the lowest possible resistance test and place the probes onto tips of the plug for the ignitor. If the multimeter shows infinity or stays at zero, the ignitor no longer works and must be replaced.

What does furnace ignitor look like?

Some burner assemblies may hold a flame sensor as well. The spark ignitor looks like a 1-inch long metal probe attached to one end of a solid ceramic tube with an electrical wire attached to the other end of the tube.

How do I clean the igniter on my furnace?

Once you have removed the sensor, rub the metal rod with fine grit sandpaper to remove grease and dirt. Then, use a clean paper towel to wipe away any remaining dust or dirt. Once you’ve cleaned it, replace the sensor and the screw, and your furnace should start working again.

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