Error code reference

Trane Furnace Error Code 2

Pressure switch is stuck closed.

First step from the service manual

Disconnect electrical power from the furnace and remove 1 wire from each pressure switch, then check continuity across PS1 or PS2.

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

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Pressure switch is stuck closed

From Service Manual 469972, p.24:

1.Disconnect electrical power from the furnace and remove 1 wire from each pressure switch, then check continuity across PS1 or PS2.

2.Measure line voltage at the power cord terminal block. Expected: 120 VAC (L1 to neutral) or 208 to 240 VAC between L1 and L2 under load.

3.Inspect the cord strain relief and terminal block screws for signs of arcing or heat discoloration. Loose connections here mimic an intermittent power failure to the control board.

Part W10911048

Power cord assembly

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First step from the service manual

Get the full diagnostic procedure for 2.

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