Trane HVAC Error Codes

8 error codes for Trane hvac models. Each links to the full diagnostic procedure from the service manual.

CodeDescription

E0Main processor error on BAYSENS135* zone sensor.E1Heat failure diagnostic indicating an error in the heating system.E2Cool failure diagnostic indicating an error in the cooling system.E3Test mode indicator showing the system is operating in test mode.E4Fan failure has occurred and service is required.E6Software conversion conflict on BAYSENS135* zone sensor.E7Communication error on BAYSENS135* zone sensor.E8Temperature input outside valid operating range (32°F-122°F) on BAYSENS135*…

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E0 on my Trane HVAC

M+

Main processor error on BAYSENS135* zone sensor

From Service Manual 376949, p.41:

1.Replace sensor.

2.Measure control board supply voltage at the test points. Expected: 12 VDC and 5 VDC; a drop below 4.75 VDC on the logic rail points to a failed onboard regulator.

3.Inspect all connectors on the main control for corrosion, thermal stress, or backed-out pins. Reseat each connector with the power disconnected.

Part WPW10804018

Electronic control board

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