How to Replace SEN01114 Furnace Flame Sensor on Trane & American Standard — Step-by-Step

Your Trane furnace fires up for a few seconds, then shuts down. The blower keeps running, but no heat. You hear the igniter click, see a brief flame, then nothing. That's your flame sensor calling it quits. The SEN01114 is one of the most common failure points in Trane and American Standard furnaces — it gets coated with carbon residue and can't prove to the control board that flame is present.

This is a straightforward repair that'll save you $150-250 in service call fees. The sensor itself is just a metal rod that sits in the flame — when it gets dirty or corroded, your furnace won't stay lit. Here's how to swap it out in about 15 minutes.

What You Need Before Starting

• 1/4" nut driver or socket
• Flathead screwdriver
• Fine-grit sandpaper or steel wool (optional, for cleaning old sensor)
• Flashlight

Repair Time: 15-20 minutes
Difficulty: Easy — No gas line work required

Safety First

Turn off power to your furnace at the breaker or wall switch. Turn the gas valve to OFF if you're uncomfortable working near gas lines, though you won't be disconnecting anything. The flame sensor is downstream from all gas connections — you're just removing an electrical component. Let the furnace cool for 10 minutes if it's been running.

Step 1: Remove the Furnace Access Panel

Pull off the lower access panel — most Trane models have panels that lift up and out. You're looking into the burner compartment now. The flame sensor is a thin metal rod (about 1/8" diameter, 2-3 inches long) mounted on a bracket near the burners. It'll have one wire connected to it.

Step 2: Disconnect the Sensor Wire

The wire connection is usually a push-on spade terminal. Just pull it straight off — no twisting needed. If it's stubborn, wiggle it gently side-to-side while pulling. Take a photo with your phone before disconnecting so you remember the wire orientation.

Step 3: Remove the Mounting Screw

There's typically one 1/4" hex-head screw holding the sensor bracket to the burner assembly. Remove it completely. On models like the ADC1B080A9421AA and ADC1B060A9361AB, the sensor pulls straight out once the screw is removed. On some American Standard units, you may need to slide the bracket sideways first.

Step 4: Install the New SEN01114 Sensor

Position the new sensor so the rod extends into the flame path — it should sit about 1/2" into the area where you see blue flame when the burners fire. The ceramic insulator should be outside the flame zone. Thread the mounting screw back in and tighten snug (don't overtighten — the ceramic can crack). Push the wire terminal back onto the sensor tab until you feel it click.

Step 5: Test the System

Replace the access panel. Turn power back on and set your thermostat 5 degrees above room temperature. The furnace should ignite and stay running. You'll hear the blower kick on after 30-60 seconds. Let it run through a complete cycle — the flame should stay lit continuously now instead of shutting down after a few seconds.

Testing After Installation

Run the furnace through 2-3 complete heating cycles over the next hour. Watch for consistent ignition and flame hold. If the furnace still shuts down after ignition, check that the sensor rod is positioned correctly in the flame path and the wire connection is solid. The sensor rod should turn slightly black after running — that's normal carbon buildup that proves it's in the flame.

Frequently Asked Questions

Why does my Trane furnace ignite then shut off after 5 seconds?

The flame sensor is the most common cause. It detects flame by conducting a tiny electrical current through the flame to ground. When coated with carbon or corroded, it can't conduct properly, so the control board shuts off gas flow as a safety measure. The SEN01114 typically lasts 5-8 years before carbon buildup becomes too heavy to clean effectively.

Can I clean the old flame sensor instead of replacing it?

Yes, temporarily. Remove it and gently scrub the rod with fine sandpaper or steel wool until shiny. This works 60-70% of the time for 6-12 months, but the rod develops microscopic pitting that eventually prevents proper flame detection. For $18.99, replacement is more reliable than repeatedly cleaning a failing sensor.

Will this sensor work on my American Standard furnace?

The SEN01114 replaces multiple Trane and American Standard part numbers including SEN00491, SEN1114, PSE-T19, B340888-2, SEN0337, and SEN0441. It's compatible with most ADC, TDH, TUD, and TUH series furnaces from both brands manufactured between 2008-2020. Check your existing sensor part number or compare the mounting bracket style to confirm compatibility.