FieldBench
Bryant codes

Bryant

45

Lockout

Control lockout

IFC parked itself.

Walk 45 in Diagnose

5 plates — walk the one on the cabinet

First check

1 Write the live code and watch one cycle

On Bryant 912S read Two-digit IFC (single-stage Comfort — not TP6, not Infinity) before you pull power. Write 45 exactly. Watch one full sequence and note which step dies. Power reset once after the root code is understood. Repeat 45 = board or persistent input.

Expect: W: Single W only. Inducer on → the one pressure switch must close (31 if it does not) → HSI → single-stage valve → flame (34 if no prove) → heat-speed blower.

The rest of the walkthrough is Diagnose.

On the plates

  • Power reset once after the root code is understood. Repeat 45 = board or persistent input.
  • Find the root two-digit first.

Plates that use 45

Same number, other makers

45 on Bryant is not the same code on these plates.