Trane E2.3: 1st stage gas valve not energized

Source: Trane manual (PDF) (opens in a new tab) ↗ · Updated

Status codeE2.3Trane
What does Trane E2.3 mean?

1st stage gas valve not energized: it failed 10 times in the same call for heat. The service facts say 24 VAC was not sensed on MVL those 10 times.

Call a pro: jump to when to call a pro Equipment type: furnace
How it shows: 7-segment display on a Trane S9V2 two-stage variable-speed furnace (Service Facts S9V2-SF-2A-EN): E2.3

Likely causes

  • 24 VAC not sensed on the 1st stage gas valve (MVL) ten times in one heat call

Safe checks for E2.3

  1. Do not jumper the gas valve to force heat
  2. Technicianthe troubleshooting step for fault 2.3 is to replace the integrated furnace control
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.

Capacitors can hold a charge after the power is off. Safety terms.

When to call a pro

Call a licensed HVAC technician. E2.3 is the gas-valve circuit after ten misses. It is not retry lockout E2.1.

Find a Trane dealer (official locator, opens in a new tab) ↗

Email me this fix

We save your email and this page. Nothing is emailed. We'll only use your email for this request.

Privacy. Deletion requests go to the address on that page.

Request a filter and maintenance reminder

We save your email, this page, and the interval you pick. Nothing is emailed. We'll only use your email for this request.

Privacy. Deletion requests go to the address on that page.

Parts & tools for this fix

Taken from this code's causes or steps. A search link opens Amazon results and does not confirm a fit. Check the model number in the manual.

Furnace control board and low-voltage fuse: guide

In this code: Parts list for this code: Integrated furnace control

This one is for a technician to test or replace, so we only explain it and do not link to buy it.

Related Trane codes

E17No return signal from the blowerE18Control does not see its ownE2.1Retry exceededE2.4High-limit output relay is not closedE3.1Shorted pressure switch, 1st stageE2.2Recycles exceeded

All Trane codes →Browse every code