Trane fault codes

Drive is enabled but stays at min Hz or 0 because analog / serial speed is missing.

2 plates

JADE LCD: ACT ERROR / ACT RANGE. Actuator did not follow command. Feedback pot off the shaft is the weekly.

2 plates

HERM and/or FAN section out of rating. Single-stage Comfort dies this way all summer.

2 plates

Wrong charge method is as common as wrong charge.

2 plates

JADE LCD: CO2 / SENS ERR. DCV sensor failed or the 0–10 V input is floating. Damper holds open; compressor never runs.

2 plates

Status. G or IFC fan-on. Not a fault.

2 plates

Indoor / stat / outdoor dropped off ComfortLink. Not an S9V2 E-decimal.

1 plate

Stat, indoor, or outdoor off the bus. Outdoor silent while the indoor is calling is often this — or a dead drive. Check bus vs drive LEDs before you gauge.

2 plates

Will not pull, chatters, or is welded.

4 plates

Mechanical cool did not prove.

2 plates

Discharge or outdoor-coil sensor open/short/out of range. ComfortLink will name which. Defrost and drive protection both lie when these are wrong.

2 plates

Inducer running, metal-vent prove failed — or the switch is already made. If the door prints S9-looking E-decimals, confirm the line here. Physics are chimney/inducer, not collector drown.

4 plates

Float switch or tripped condensate opened 24V.

2 plates

Line polarity, missing ground, or IFC power-quality family. Read the exact E1 decimal on THIS door card / service facts — do not invent a title.

2 plates

On doors that print E2.1: ignition tries exceeded on this heat call. Confirm THIS S9X1 card — do not invent a different title.

6 plates

Trane Link-enabled alarm table: first-stage PS is shorted / already made when the IFC expected it open.

2 plates

If these decimals are on THIS S9V2 door they are the OPEN first- / second-stage PS counterparts to the confirmed shorted E3.1 / E3.3. Do not assert an unconfirmed OEM title — read the exact door line / service facts.

2 plates

Trane Link-enabled alarm table: second-stage PS is shorted / already made when the IFC expected it open.

2 plates

Trane S9V2 alarm table: reverse-airflow limit is open.

2 plates

Flame-sense or unexpected-flame family. Confirm the exact decimal and OEM line on THIS S9V2 door card / service facts.

2 plates

HSI or gas-valve electrical family. Confirm the exact decimal on THIS door card / service facts.

2 plates

Field-reported on some S9V2 door cards as indoor blower / IFC-to-motor communication. Read the exact door line. Do not treat E13 as Carrier 13 (limit lockout).

2 plates

Start here when the hood is the complaint. Title 24 FDD classes: sensor, not-economizing, false-economizing, damper not modulating, excess OA.

2 plates

Drive has line voltage but will not run — the unit board never enabled it.

2 plates

Damper open past the commanded minimum with no economizer or DCV request.

2 plates

Damper open with OA above changeover. Space hot, high OA bills, or wet coil.

2 plates

Indoor fan did not prove.

2 plates

JADE LCD: FREEZING. Mixed air below the low-limit. Damper drives shut; mechanical cool may lock.

2 plates

Keypad example: GF. Drive sees current to ground on the motor leads.

2 plates

Heat section did not prove.

2 plates

Discharge / liquid opened the high-pressure switch.

4 plates

Still real on an inverter. High = outdoor airflow / overcharge / restriction. Low = charge, indoor airflow, metering.

2 plates

Status. First / second heat stage is firing.

2 plates

Status. No heat/cool/fan call the IFC is honoring.

2 plates

HSI / gas / flame prove. If THIS door prints E2.1, treat it as retry lockout the same way as the S9 IFC — confirm the card. Do not invent a different title.

5 plates

Trial without flame, or unexpected flame. Confirm the ComfortLink text — do not map it to S9V2 E2.1 / E5.x by habit.

1 plate

Outdoor inverter protection. Read the drive LED / ComfortLink text. Not a contactor or dual-cap failure.

2 plates

Overtemp / airflow. 80% coils still dirty.

9 plates

Communicating heat CFM is a bus request, not a tap.

1 plate

Drive is running too slow to close the prove switch, so the unit board reports fan fail. Reliatel example: Fan Fail with the drive still at min Hz.

2 plates

Suction dropped out the low-pressure switch.

2 plates

JADE two-line LCD: MA / SENS ERR. Mixed-air sensor failed. This one alarms immediately on power-up — others wait the 60-minute setup window.

2 plates

Damper is two-position (0 or 100) instead of tracking 2–10 V. Title 24 FDD class.

2 plates

OA is in the free-cooling window and the damper stayed shut. Title 24 FDD class.

2 plates

JADE LCD: OA / SENS ERR (or OA SYLK ERR). Outside-air thermistor failed or lost SYLK. Board thinks the roof is 20 °F or 120 °F.

2 plates

Keypad example: oC (Yaskawa) or OC. Output current trip. Locked rotor, dirty filters, or FLA set too low.

2 plates

Fan not turning. Compressor may still run and then HPS.

2 plates

Keypad example: oH. Drive thermal trip.

2 plates

Fan not following the drive. Head pressure climbs, HPS or inverter OH follows.

2 plates

Keypad example: ov (Yaskawa) or OU. DC bus high. Usually regen on decel, not a new drive.

2 plates

Keypad example: PF. Missing or imbalanced incoming phase.

2 plates

Three-phase monitor opened.

2 plates

If this door shows a polarity / line / ground token, treat L1/N and chassis ground. Confirm the exact code here.

4 plates

Modulating prove failed at the requested capacity. Not a single discrete PS swap.

1 plate

One switch, one hose, 96% collector/trap. Open = will not prove. Closed/shorted = already made with inducer off. Use the decimals printed on THIS door — do not import S9V2 E3.1/E3.3 or a second-stage pair.

4 plates

JADE LCD: RA / SENS ERR. Return-air thermistor failed. Differential / enthalpy changeover compares OA to RA.

2 plates

Flame left the burner box.

1 plate

Supply, return, or OA sensor out of range.

1 plate

Supply or return smoke detector, or a firestat, has the unit locked out.

2 plates

Keypad example: Uv (Yaskawa) or LU. DC bus dropped. Incoming power or a missing phase.

2 plates

The indoor fan is a drive, not a contactor + cap. Type the keypad string: oC, Uv, ov, GF, oH, PF.

2 plates