Error code reference

Trane Furnace Error Code 1

Flame sensed when no flame should be present.

First step from the service manual

Disconnect electrical power to furnace, turn off gas supply, remove gas valve and inspect for moisture or debris in inlet gas screen.

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

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Flame sensed when no flame should be present

From Service Manual 469973, p.25:

1.Disconnect electrical power to furnace, turn off gas supply, remove gas valve and inspect for moisture or debris in inlet gas screen.

2.Measure the inlet valve coil resistance at the valve connector. Expected: 1,000 to 1,200 ohms per coil at room temperature.

3.Verify static water supply pressure at the inlet hose. Below 20 psi or fluctuating supply commonly triggers fill-timeout faults.

Part WPW10212598

Water inlet valve

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