The Trane XE90 is a gas furnace that uses an ignitor to light the gas and heat the air. The ignitor is a small ceramic rod that glows red hot when electricity passes through it. The ignitor is located inside the burner assembly, near the gas valve. The ignitor can wear out over time and fail to light the gas, resulting in no heat or a delayed ignition.

If you have a Trane XE90 furnace that is not heating properly, you may need to replace the ignitor. Replacing the ignitor is a relatively simple and inexpensive repair that you can do yourself with some basic tools and safety precautions. Here are the steps to follow:

1. Turn off the power to the furnace at the circuit breaker or the main switch.
2. Remove the access panel on the front of the furnace by lifting it up and pulling it out.
3. Locate the ignitor inside the burner assembly. It is a small white or gray rod with two wires attached to it.
4. Disconnect the wires from the ignitor by pulling them off gently. Do not pull on the wires themselves, but on the metal connectors.
5. Remove the mounting screw that holds the ignitor in place with a screwdriver.
6. Lift out the old ignitor and discard it.
7. Install the new ignitor in the same position as the old one. Make sure it is aligned with the gas burner and does not touch any metal parts.
8. Secure the new ignitor with the mounting screw.
9. Reconnect the wires to the new ignitor by pushing them onto the metal connectors.
10. Replace the access panel on the front of the furnace by sliding it in and pushing it down.
11. Turn on the power to the furnace and test its operation.

You have successfully replaced your Trane XE90 ignitor. Enjoy your warm and cozy home!

Some tips to keep your Trane XE90 furnace running smoothly and efficiently are:

• Change the air filter regularly, at least every three months or more often if you have pets or allergies. A dirty filter can restrict airflow and cause the furnace to work harder and use more energy.
• Clean the burners and the flame sensor periodically with a soft brush or a vacuum cleaner. Dust and dirt can accumulate on these parts and affect the ignition and combustion process.
• Inspect the vent pipe and the exhaust fan for any blockages or leaks. A blocked or leaking vent can cause carbon monoxide to build up in your home, which is a serious health hazard.
• Have a professional service your furnace once a year, preferably before the heating season. A qualified technician can check the gas pressure, the electrical connections, the safety controls, and other components for any signs of wear or damage.

By following these tips, you can extend the life of your Trane XE90 furnace and save money on your energy bills.

One of the most common signs that your Trane XE90 ignitor needs to be replaced is a delayed ignition. This means that the furnace takes longer than usual to light the gas and start heating the air. You may hear a loud bang or pop when the gas finally ignites, which can damage the heat exchanger and other parts of the furnace. A delayed ignition can also cause carbon monoxide to leak into your home, which is very dangerous.

Another sign that your Trane XE90 ignitor is failing is a weak or intermittent flame. This means that the ignitor is not producing enough heat to ignite the gas properly, resulting in a low or fluctuating flame. A weak or intermittent flame can cause incomplete combustion and produce soot and carbon monoxide. It can also reduce the efficiency and performance of your furnace.

A third sign that your Trane XE90 ignitor is bad is a no-heat situation. This means that the ignitor does not glow at all and does not light the gas. This can happen if the ignitor is cracked, broken, or burned out. A no-heat situation can leave you without heat in the middle of winter, which can be very uncomfortable and unsafe.