trane furnace codes

The flashing LEDs on your furnace will correspond to a specific fault code that is shown here on their diagnostic chart.

If you have a Trane furnace, then you have one of the most reliable heating systems in existence. However, even the most reliable furnace runs into problems from time to time, and this is why your Trane has included several error codes to help you find a given issue. However, if you’re unfamiliar with error codes for furnaces, then you may be unaware of what these codes mean.

To get peace of mind, it’s important that you take a look at typical Trane furnace error codes to you learn what these error codes mean so you can get your system the service it needs.

CODE: Flashing Slow

RESULT: Normal no call for heat.
FIX: This is only an issue if you have raised your thermostat and your furnace doesn’t respond.

CODE: Flashing Fast

RESULT: Normal call for heat.
FIX: Only beware this if your furnace is continuously calling for heat and isn’t responding to your thermostat..

CODE: Continuous On

RESULT: Control panel issue.
FIX: Replace Control Panel.

CODE: Continuous Off

RESULT: Check Power.
FIX: Check Power.

CODE: 2 Flashes

RESULT: External Lockout (Retried or recycles exceeded).
FIX: Check for miswiring, clogged pilot tube, or humidity in the unit.

CODE: 3 Flashes

RESULT: Pressure Switch error.
FIX: Check if the drain tubes are full of moisture or obstructed with dirt.

CODE: 4 Flashes

RESULT: Open high limit device.
FIX: The issue with thermal protection.

CODE: 5 Flashes

RESULT: Flame sensed when NO flame should be present.
FIX: Check for a leaky gas valve, stuck gas valve, or defective flame sensor.