Error code reference

Trane Furnace Error Code 6

1st stage pressure switch has opened 5 times within one cycle

1st stage pressure switch has opened 5 times within one cycle — 1 hour lockout.

First step from the service manual

Follow same troubleshooting as 3 flash fault (1st stage pressure switch fault); verify wiring, inducer motor operation, and pressure readings.

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

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1st stage pressure switch has opened 5 times

From Service Manual 469968, p.20:

1.Follow same troubleshooting as 3 flash fault (1st stage pressure switch fault); verify wiring, inducer motor operation, and pressure readings.

2.Measure door lock assembly resistance across the PTC terminals. Expected: ~200 ohms cold, rising sharply once energized.

3.Inspect strike and latch alignment. A warped door or misaligned strike prevents the switch stack from closing in the correct sequence.

Part W10810403

Door lock assembly

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