ApplianceField Lab
Field evidence

The Flame Lit, Ran Briefly and Did Not Relight

The shutdown occurred after the same few seconds on repeated starts. Comparable post-cleaning cases were fixed by correcting air leaks at the vent connection, but that branch was not tested on this dryer.

Gas Dryer LG dlg5988s Flame Goes Out After Seconds

What was measured and observed

  • The exact dryer was LG DLG5988S.
  • The burner lit and then stopped after only a few seconds.
  • Repeated starts shut down after similar timing, with no automatic relight afterward.
  • The igniter measured 199 ohms.

A similar symptom can have a different cause on another dryer. Igniter resistance and a brief flame do not clear the combustion-air, flame-sensing or valve branches.

A source-video frame showing the glowing igniter and burner tube; the still image does not establish the later flame shutdown.
A source-video frame showing the glowing igniter and burner tube; the still image does not establish the later flame shutdown.

Why recent vent cleaning changed the first check

A technician reported repeatedly receiving this complaint after a vent-cleaning company had reassembled the duct without sealing both sides of a connection. The resulting air path changed burner behavior. That technician reported six comparable dryers restored after the vent connection was correctly sealed.

The exact DLG5988S thread ended before this test was performed, so the page keeps flame sensor and gas-valve assembly as unresolved alternatives.

A safer order of diagnosis

  1. Inspect the complete vent installation and recent work.
  2. Verify combustion airflow with the dryer assembled as designed.
  3. Observe the flame-sensor sequence and gas-valve behavior.
  4. Use model documentation before condemning the board.
Gas and carbon-monoxide safety: stop using a dryer with unstable flame. Do not run it with the burner compartment open or alter the vent as a homeowner test. Qualified service must verify gas tightness, combustion and exhaust.
Unexpected turn

A repair that did not follow the obvious path

An unusual turn supported by the case record Bosch E24 Returned After the Drain Pump Was Replaced A Bosch drained completely after a new drain pump but E24 returned. The case explains why circulation-pump rotor play became the next check.
Fresh field notes

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