Code index · 14 entries
Trane furnace error codes
14 codes from the Trane furnace manual. Select a code for causes, safe checks and when to call a pro. View the source manual (PDF).
Loss of the IRQ or other internal failures (internal furnace control error).
Open limit: main thermal limit, flame rollout switch, or reverse airflow switch.
Flame detected when it should not be present.
Voltage reversed polarity or bad grounding.
Low flame current, but still strong enough to allow operation.
Open inducer limit switch or condensate pressure switch.
Open fuse: the onboard 5 amp fuse is open or missing.
Retry exceeded: flame never sensed after 3 ignition tries in one call for heat. One-hour lockout.
Recycles exceeded: flame sensed then lost 10 times (or PS1 open 10 times) in one call for heat. One-hour lockout.
Open pressure switch, 1st stage: PS1 is open when it should be closed.
Shorted pressure switch, 1st stage: PS1 is closed when it should be open.
Open pressure switch, 2nd stage: PS2 is open when it should be closed.
Igniter relay fault or igniter open/shorted.
1st stage gas valve (MVL) is energized when it should be off.