FieldBench
Lennox codes

Lennox

E273

Lockout

Soft lockout — last recycle flame failure

Lost flame after it had proven.

Walk E273 in Diagnose

4 plates — walk the one on the cabinet

First check

1 Measure µA while it is running

Do not clean first and guess. Series-µA the rod on Lennox EL195NE during a call. Falling µA is oxide, ground, or a dying flame. A hard drop is often the pressure switch or limit opening, not the rod. F-menu µA, rod, ground, manifold after blower-on. Flame that dies when the wheel starts is often draft or a weak rod.

Expect: Flame (F menu): µA per EL296 card. Rising while running.

The rest of the walkthrough is Diagnose.

On the plates

  • F-menu µA, rod, ground, manifold after blower-on. Flame that dies when the wheel starts is often draft or a weak rod.
  • Pairs with E240.
  • Rod µA, ground, manifold after blower-on.

Plates that use E273