A furnace's lifespan varies, but most can last for around 20 years or more. Regular maintenance and repairs can extend the life of your furnace. The efficiency of your furnace is also important to consider. The efficiency of a furnace will determine how often you need to replace parts. If your furnace is not as efficient as you'd like, it's a good idea to replace it sooner rather than later.

The cost of replacing your furnace's ignitor depends on several factors. Some parts are relatively inexpensive, while others are expensive. The best way to avoid a high price is to purchase a replacement from the manufacturer. This will save you the expense of hiring a technician and buying a poor-quality part. Replacement parts for your furnace ignitor will typically cost around $300 to $425, depending on the make and model of your furnace. This cost will also include the cost of a flame sensor, which monitors the heat generated during combustion.
Costs vary depending on the parts and labor needed. For example, a replacement part for a furnace varies in price, depending on the complexity of the part.  If you are planning to do the job yourself, you should know the cost of materials and labor.

The process of replacing a furnace can be difficult and time-consuming. It is important to take into account a variety of factors. First, you should hire a professional to do the job. A good installer will be careful to protect your home from potential hazards. 

The most common reason for a furnace's ignition to go out is a faulty igniter. It may not have enough electrical continuity to properly ignite the gas or be too weak. Look for cracks in the base or element of the igniter to check its condition. To check for electrical continuity, use a multimeter. Good electrical continuity should give you a reading between 20 and 400 ohms.
If these tests prove that the problem is with the ignitor, you should replace the ignitor. However, other components may also be causing the pain. In that case, you will need to perform furnace troubleshooting to eliminate these other possible causes.

If you notice that the furnace blower motor is running too slowly or inconsequentially, the capacitor may be faulty. Check the capacitor's voltage rating and replace it if necessary. A capacitor is a small electrical device that stores electric energy and provides the torque necessary to run a motor.
A dirty furnace blower motor can cause overheating and eventual mechanical failure. To prevent this, modern blower motors come with electronics to prevent overheating and self-inflicted damage. If you notice that your furnace is running intermittently, check the blower wheel for any damage.

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