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What is an HSI on a furnace?

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What is an HSI on a furnace?

Asked By: Aderita Mentaberri | Last Updated: 24th May, 2020

What is an HSI on a furnace?

The hot surface ignitor (HSI) is the most commonly used electronic ignition system. When the thermostat calls for heat, 24 volts are sent to the electronic ignition control module, which energizes the furnace blower and other systems and sends 120 volts to the HSI.





Moreover, how do I test my furnace HSI?

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.

Likewise, how long should Furnace Ignitor last? four to seven years

Consequently, how do you know if furnace ignitor is bad?

Here are the steps to troubleshooting an igniter:

  1. Turn off the furnace at the electrical switch on the side of it.
  2. Locate the ignitor.
  3. Remove the screw or screws holding the ignitor in place.
  4. Pull out the ignitor and unplug if from the wiring harness.
  5. If the ignitor is cracked, it is bad.

How does a hot surface igniter work?

The hot surface igniter works like a light bulb filament, except here, we want the heat from the element, not the light. The hot surface igniter is usually made from a material like silicon carbide or nitride and as electricity passes through the igniter, it will glow red hot.

What is an HSI on a furnace?

Why do furnace ignitors fail?

Most of the time when ignitors go bad that often it is because the ignitor is not shutting off after the gas in the furnace is ignited. If the ignitor stays on for an extended period of time this will make the ignitor short-lived. Too much voltage to an 80 volt ignitor will burn them out quickly.

How do you diagnose a gas furnace?

Furnace Troubleshooting Recap:
  1. Clean or replace air filter.
  2. Troubleshoot thermostat problems — replace batteries if necessary.
  3. Set thermostat to heat and at a higher temperature than the current room temperature.
  4. Check electrical panel for blown fuses or tripped breakers.
  5. Make power switch near furnace is flipped on.

How much is a furnace ignitor?

The average cost of furnace ignitor replacement done by a professional is around $195. The price range for this affordable furnace repair is $30 to $245. If the repair is made during an emergency call, cost can rise to $300 or more.

How do you light a gas furnace with electronic ignition?

The pilot light has a separate small gas line running to it with its own valve. When the furnace comes on, this valve opens, and then the electric spark ignites the pilot. A flame sensor detects that the pilot is lit, opens the valve to the burners, and the pilot light ignites the burners.

Where is the furnace ignitor?

The igniter is located in the flow of gas entering the burners. When the thermostat calls for heat, 24 volts are sent to the electronic ignition control module, which energizes the furnace blower and other systems and sends 120 volts to the HSI.

Can a furnace ignitor be cleaned?

A dirty ignitor will prevent your furnace from lighting. The ignitor takes a small amount of electricity and ignites the fuel to create the heat in your furnace. Repairing this item usually means replacement. Before you replace the ignitor, try cleaning it with a quick blast of air.

Can hear your furnace click on but it does not fire up?

The Pilot Light (Faulty Ignition Sensor) The pilot light or ignition sensor is usually the most common issue when your furnace will not ignite. This is typically the problem if you can hear your furnace click on but it does not fire up. If the sensor or ignitor is dirty, it will need to be cleaned.

Does Walmart sell furnace ignitors?

Furnace Ignitor 41-408 (2 Pack) for Carrier, Bryant 62-22868 – Walmart.com.

What does a 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.

Why does my boiler not ignite?

Burner won’t ignite: This is the most common cause of a boiler failing to provide heat. If the gas jets on the burner will not ignite, no heat will warm up the water in the tank. The trouble may be due to a failed electronic igniter/pilot light, or perhaps trouble in the gas line.

Should the pilot light always be on in a gas furnace?

If you have an older gas furnace, your heating unit relies on a little blue flame known as a pilot light to ensure ignition of the burners. Water heaters, gas fireplaces and old gas stoves also often have similar pilot lights. Since the pilot light needs to remain active, your furnace is always consuming some gas.

How long does a furnace last?

Average Furnace Lifespan

While some furnaces can last over 40 years (extremely rare), the average lifespan of a typical gas furnace is around 15-30 years. As long as you have scheduled yearly furnace maintenance, your furnace should easily last over 15 years.

Are furnace ignitors universal?

The Honeywell Universal Hot Surface Igniter is a handy part for repairing various furnace models from major furnace manufacturers. This igniter can replace over 100 different igniter models and features 6 brackets for easy installation.

What causes furnace ignition lockout?

All furnaces need to have adequate ventilation and a dirty air filter can cause a system lockout to occur. Another common problem that can cause a furnace lockout is a dirty flame sensor. The flame sensor comes into contact with the flame, and it is quite common for debris to buildup on it.

Why is my furnace flashing a red light?

Thermostat red light flashing or stays on: When the thermostat light (Emergency Heat Light) is flashing or on during normal operation (whether in the cooling or the heating mode, but not the Emergency Heat mode), this usually indicates that the outdoor unit is “locked-out”.

How do you light a self igniting furnace?

Furnace
  1. Look for a switch inside or near the furnace that turns it on and off. Make sure that it’s set to on.
  2. Make sure the gas valve is turned on.
  3. Examine the circuit breaker for the furnace.
  4. Check the pilot light.
  5. Leave the setting for lighting the pilot on for a few minutes after getting it lit.

How do igniters work?

When the button on a Piezo electric ignitor is pressed, a spring loaded hammer strikes quartz in order to create a spark. This is the typical process used in such lighters. This creates the necessary amount of voltage to generate a spark. Piezoelectric devices are much longer lasting than devices that depend on flint.

What is an HSI on a furnace?

What is an HSI on a furnace?

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