Home Product SupportIdentify a code

Expanded exact-code directory

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace error codes

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace indicators as Trane lists them, each with its meaning and the first safe check.

  • e01-internal-control-error
    Loss of the IRQ or other internal failures.
  • e04-open-limit
    Open limit: the main thermal limit, a rollout
  • e05-flame-detected-when-not-expected
    Flame detected when it should not be present.
Exact codeDocumented meaningFirst safe checkVerificationStop condition
Part of Trane expanded error-code library guide

Reviewed records

4 exact answers

Diagnose the exact device problem
Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace · exact showing

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace showing E09: meaning and exact next steps

E09 means Open inducer limit switch or condensate pressure switch.

Open record Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace · exact showing

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace showing E18: meaning and exact next steps

E18 means Blower communication failure on the control. Trane lists this code in its S9V2 guide only.

Open record Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace · exact showing

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace showing E2.1: meaning and exact next steps

E2.1 means Retry exceeded: flame was never sensed. The furnace locks out for one hour after 3 tries.

Open record Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace · exact showing

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace showing E3.2: meaning and exact next steps

E3.2 means Open pressure switch, 1st stage.

Open record

Every code

Every Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code: what it means and what to do

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e01-internal-control-error

Loss of the IRQ or other internal failures. Trane labels this an internal integrated furnace control error.

Turn the furnace's power off at the switch for a minute and back on, and note whether E01 returns.

An internal control error points to the control board, which is not a homeowner repair.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e04-open-limit

Open limit: the main thermal limit, a rollout switch or the reverse airflow switch is open.

Check that the air filter is clean and the supply and return registers are open.

A filter and registers are general first checks that need no tools; the limit and rollout switches belong to a technician, and a tripped rollout switch means flame went where it should not.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e05-flame-detected-when-not-expected

Flame detected when it should not be present.

Note whether the burners are lit or glowing when the furnace is not calling for heat.

Flame with no call for heat is a stop condition and points to the gas valve, which is technician work.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e08-flame-current-low

Flame current is low, but still strong enough to allow operation.

Note whether the burners light and stay lit.

A weak flame signal is a flame-sensing problem, and testing or cleaning the sensor is technician work.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e11-gas-valve-relay-or-energizing-fault

A gas valve relay or energizing fault. Trane lists five cases: the 1st stage gas valve not energized when it should be; the 1st stage gas valve relay stuck closed; the 2nd stage gas valve relay stuck closed; the 2nd stage gas valve energized when it should not be; and the 2nd stage gas valve not energized when it should be. Trane's S9X guide marks the three second-stage cases as not applicable to the S9X1 and S9B1.

Note whether the burners light, and whether they light when the furnace is not calling for heat.

Every case is a gas-valve or relay problem, which belongs to a licensed technician.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e12-open-fuse

Open fuse.

Turn the furnace's power off at the switch first.

The control board carries a 5 amp fuse, and replacing it without finding why it blew can repeat the failure, so a technician should check the low-voltage wiring.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e13-blower-hp-oem-id

Blower HP/OEM ID. Trane lists this code in its S9V2 guide only.

Note whether the furnace or its control board was recently serviced or replaced.

Trane's table names this as a blower horsepower and identification fault. A technician should confirm the control and blower motor match.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e14-no-personality-module-and-local-copy-bad

No personality module (PM) and the local copy of the unit data file is bad. Trane lists this code in its S9V2 guide only.

Note whether the control board was recently replaced.

The personality module holds the furnace's unit data, and it belongs to a technician.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e15-unit-data-files-corrupt

Both the unit data file in the personality module (PM) and the local unit data file are corrupt. Trane lists this code in its S9V2 guide only.

Note whether the control board or personality module was recently replaced.

Restoring unit data belongs to a technician.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e17-blower-motor-no-communication

Blower motor no communication response. Trane lists this code in its S9V2 guide only.

Turn the furnace's power off at the switch for a minute and back on, and note whether E17 returns.

A motor that does not answer the control belongs to a technician.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e2-2-recycles-exceeded

Recycles exceeded: flame was sensed and then lost. The furnace locks out for one hour after 10 times.

Note whether the burners light and then go out repeatedly.

Flame-sensing and gas checks belong to a technician.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e2-3-first-stage-gas-valve-not-energized

The 1st stage gas valve was not energized when it should be, exceeded after 10 times.

Note whether the burners ever light.

The gas valve circuit belongs to a technician.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e3-1-shorted-pressure-switch-first-stage

Shorted pressure switch, 1st stage.

Note that the code appears at the start of a heating call.

The pressure switch and its wiring belong to a technician.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e3-3-shorted-pressure-switch-second-stage

Shorted pressure switch, 2nd stage. Trane's S9X guide marks this as not applicable to the S9X1 and S9B1.

Note that the code appears when the furnace moves to second stage.

The pressure switch and its wiring belong to a technician.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e3-4-open-pressure-switch-second-stage

Open pressure switch, 2nd stage. Trane's S9X guide marks this as not applicable to the S9X1 and S9B1.

Look outside for a blocked intake or exhaust pipe termination, such as snow, leaves or a nest.

The outside vent check is the safe one, and the pressure switch belongs to a technician.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e6-1-reversed-polarity

Voltage reversed polarity.

Note whether any wiring work or a power-outlet change happened recently.

Polarity is line-voltage work for a licensed technician.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e6-2-bad-grounding

Bad grounding.

Note whether any wiring work or a power-outlet change happened recently.

Grounding is line-voltage work for a licensed technician.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e6-3-igniter-relay-fails-or-igniter-open

Either the igniter relay fails or the igniter is open. Trane lists both as causes of this code.

Note whether the hot surface igniter glows when the furnace starts.

Igniter and relay testing needs a meter and belongs to a technician.

Trane S9V2, S9X1, S9X2 and S9B1 condensing furnace code e7-1-first-stage-gas-valve-energized-when-off

The 1st stage gas valve (MVL) is energized when it should be off.

Note whether the burners are lit or glowing when the furnace is not calling for heat.

Gas at the burners with no call for heat is a stop condition, and the valve is technician work.

Trane — Installer's Guide 18-CE01D1-1E-EN: Integrated Furnace Control Display Codes (S9V2)