Error code reference

Trane Furnace Error Code 5

Open roll out switch or open low voltage fuse.

First step from the service manual

Check if a manual reset flame rollout switch is open; also check if low voltage fuse on board is open.

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
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Open roll out switch or open low voltage fuse

From Service Manual 469969, p.21:

1.Check if a manual reset flame rollout switch is open; also check if low voltage fuse on board is open.

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 5.

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