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Trane E01: Loss of the IRQ or other internal failures (internal furnace control error)

From the Trane furnace manual · Updated 2026-10-23

What it means

Loss of the IRQ or other internal failures (internal furnace control error).

⚠ Call a profurnace
How it shows: 7-segment display alternates with mode: E01

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1Likely causes

  • Internal failure of the control board

2Safe DIY steps

  1. Technicianreplace the integrated furnace control (IFC)
⚠ Safety firstIf you smell gas, do not touch any electrical switch or use a phone in the building; leave immediately and call your gas supplier from outside. Turn off electrical power at the furnace switch or breaker before opening any panel, and never bypass or jumper a limit, rollout or pressure switch. Gas valve, burner, venting, wiring and control-board work should be done by a licensed HVAC technician.

3When to call a pro

Call a licensed HVAC technician: board replacement must be done by a technician.

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Other Trane codes

E04

Open limit: main thermal limit, flame rollout switch, or reverse airflow switch.

E09

Open inducer limit switch or condensate pressure switch.

E05

Flame detected when it should not be present.

E08

Low flame current, but still strong enough to allow operation.

E06

Voltage reversed polarity or bad grounding.

E12

Open fuse: the onboard 5 amp fuse is open or missing.