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HVAC Ignition module

Common problems and Replacement process of ignition module in the furnace

What is an Ignition Module in a Furnace?

An ignition module is an electronic ignition system. It is used to make contact circuit breakers for the coil. The ignition module is mostly used in modern gas furnaces instead of old ones. Pilot lights are used in an old gas furnace. Silicon nitride or silicon carbide is used to make the ignition module.

How does the ignition module work in a furnace? 

In a gas furnace, when the thermostat turns on, the ignitor produces a spark that "ignites" the fuel connected to your furnace. It is a necessary component to release the fire from the spark plugs. For the motor to work correctly, every spark plug must burn at precisely the time. The ignition module takes signals to decide when the spark plugs should be fired. 

How to test if the ignition module is working or not?

Connect the negative terminal of the battery on the ignition coil to the earth line from the 12 v test light. Turn the engine over many times with your spouse. This test light should turn on and off periodically. Here, your module is functional and no additional testing is required.

Common causes that damage the ignition module:

  • The problem in gas supply: Checking the supply of gas to your residence is the right way to find out the problem. Find a gas furnace and see if it is working or not. If it is not working, then there is a problem with your home's gas supply, which is causing the ignitor in your furnace to not ignite. If your home's fuel supply is fine, it's possible that your furnace's gas supply is malfunctioning. Here, contact an HVAC professional to inspect what's causing the gas shortage in your furnace. Maybe something just a faulty valve or something more serious.
  • Faulty ignitor sensor: the ignitor sensor is a safety device in the furnace. It informs the furnace when it is safe to ignite. Once the ignitor sensor detects a flame, the furnace knows it's safe to switch on the gas. The ignitor sensor can become dusty and hence unable to detect the flame. The ignitor sensor should be cleaned if you suspect this is the problem.
  1. Turn off your furnace's power source to clean the ignition sensor. 
  2. Using a screwdriver, remove the sensor's mounting screw.
  3. Then lift the sensor out. Because it's a delicate component, use caution when handling it.
  4. After removing the sensor, use fine-grain sandpaper to clean the metal rod of grease and grime. 
  5. Then wipe away any leftover dust or grime with a clean paper towel. 
  6. Replace the old sensor with a new one and the screw after cleaning it. 
  7. Then start the furnace.
  • Defective or dirty air filters: To avoid difficulties in the ignition system, air filters must be cleaned or replaced regularly. However, many furnace homeowners neglect to do so. If a furnace's air filter becomes blocked, then it will no longer ignite for safety reasons. Inspect the air filter. If it appears to be clogged, this is most likely the source of the problem. Replace the air filter and see if your ignitor works or not. 
  • Damaged circuit breakers: Many problems arise when circuit breakers fail. Check to see if your furnace is plugged in. Check the power supply and all the cable connections. If all the gadgets attached to the furnace's main circuit board are working properly. If the main circuit board appears to be in good working order, open the furnace circuit breaker access panel. Inspect the circuit breaker for the proper operation of all switches. If any switches have been tripped, reconnect them. Start your furnace and make sure the furnace igniter works properly. If the problem persists, contact an HVAC specialist.
  • The high current supply to the furnace: A sudden high or low voltage supply may damage the electrical devices. Take voltage readings, because a power surge is not safe for your furnace. The furnace automatically burns out. If any damage happens, then call a technician and replace the damaged parts.

Replacement steps of ignition module:

  • Turn the furnace's electricity off.
  • Disconnect the wires of the ignitor.
  • The ignitor wires are commonly contained in a plastic plug and socket in hot surface ignition systems.
  • In most spark ignition systems, the ignition module is connected by only one wire.
  • The ignitor can then be removed by unscrewing the mounting screws.
  • Use the numbers on the ignitor to determine the right replacement, or buy one of several universal kits.
  • The mounting screws can secure the replacement ignitor. 
  • Then reconnect the wires and turn the furnace back on.
  • After you've replaced the ignitor, make sure to run it through a full heating cycle.

Buy a new ignition module from the PartsHnC website by referring to the below links:

Product Name: Ignition Module For Carrier Part

Part Number: LH33WZ512

Manufacturer Name: Carrier

Link: https://www.partshnc.com/lh33wz512-ignition-module-carrier   

Product Name: Ignition Module For Honeywell Part 

Part Number: S8670D3006

Manufacturer Name: Honeywell

Link: https://www.partshnc.com/s8670d3006-ignition-module-honeywell   

Product Name: Ignition Module For Trane Part

Part Number: MOD1393

Manufacturer Name: Trane

Link: https://www.partshnc.com/mod1393-ignition-module-trane   

Product Name: Ignition Module For Amana-Goodman Part 

Part Number: C6411103

Manufacturer Name: Amana Goodman

Link: https://www.partshnc.com/c6411103-ignition-module-amana-goodman   

 Product Name: Ignition Module For Utica-Dunkirk Part 

Part Number: 14662803

Manufacturer Name: Utica-Dunkirk

Link: https://www.partshnc.com/14662803-ignition-module-utica-dunkirk    

Product Name: Ignition Module For Laars Heating Systems Part 

Part Number: E2102800

Manufacturer Name: Laars Heating Systems 

Link: https://www.partshnc.com/e2102800-ignition-module-laars-heating-systems  

PartsHnC is the right website for you to purchase any HVAC equipment parts. Replace the ignition module at an affordable price. Learn how to replace the ignition module in the furnace and replace it. PartsHnC saves you from spending extra money on learning. Learn free of cost and buy HVAC equipment parts at a low cost. Send an email to [email protected] or call on toll-free number (866) 963-0907 for purchase-related or website-related queries.

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