FieldBench
Bryant codes

Bryant

LED off

Lockout

IGC dark

No 24V at the ignition control, or the module is dead.

Walk LED off in Diagnose

Sign in for the next measurement

First check

1 Measure at the IFC under load

On Bryant 581J line-voltage codes are incoming power. Measure L1/L2 (or L1/N) at the board while it is trying to run, not just at the disconnect. 24 VAC at IGC R to C. Control fuse / breaker on the unit board.

Expect: Voltage in the rating-plate window under load.

The rest of the walkthrough is Diagnose.

On the plates

  • 24 VAC at IGC R to C. Control fuse / breaker on the unit board.
  • W present during a heat call. Unoccupied shutdown will darken this LED.
  • Door / heat-section plug seated. A rooftop heat-exchanger panel switch is easy to leave open.

Plates that use LED off

Same number, other makers

LED off on Bryant is not the same code on these plates.