Error code reference

Trane Hvac Error Code E2

Cool failure diagnostic indicating an error in the cooling system.

First step from the service manual

Check compressor proving circuits (CC1/CC2), compressor disable inputs, and zone temperature sensor inputs.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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Step-by-step tests with expected resistance, voltage, and continuity values
Wiring diagram references and connector pinouts from the OEM service manual
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E2 on my Trane HVAC

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Cool failure diagnostic indicating an error in

From Service Manual 376951, p.43:

1.Check compressor proving circuits (CC1/CC2), compressor disable inputs, and zone temperature sensor inputs.

2.Disconnect the sensor and measure resistance at the sensor body. Expected: 10 kΩ to 12 kΩ at 77°F (25°C).

3.Check the sensor harness for opens and shorts. Back-probe the sensor pins at the control board connector; a reading outside 5 kΩ to 50 kΩ indicates a failed sensor.

Part WP8577274

Temperature thermistor

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First step from the service manual

Get the full diagnostic procedure for E2.

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