FieldBench
Bryant codes

Bryant

31 / 32

Lockout

Low vs high pressure switch

Two-stage draft path. 31 is the active-stage / draft prove; 32 is low-fire PS. Unlike 59MN7, these are discrete switches.

Walk 31 / 32 in Diagnose

Sign in for the next measurement

First check

1 Prove inducer and the live code

Do not pull power — that clears the Bryant 935CA active code. Write 31 / 32. Is the inducer spinning on this call? Silent inducer is not a pressure switch. Two hoses, two switches. Do not treat this as a modulating band.

Expect: 120 VAC at the inducer on a heat call. Wheel turning.

If fail: 120 VAC missing → IFC / door switch / incoming power. Voltage + dead motor → inducer.

If pass: Inducer running + this code → trap, hose, switch, vent (step 2).

The rest of the walkthrough is Diagnose.

On the plates

  • Two hoses, two switches. Do not treat this as a modulating band.
  • 32 = low-fire hose, low inducer, attic PVC/trap/wind.
  • High-fire prove fail is the high PS, not a 59MN7 42 band story.
  • Trap and collector first — 96% physics.

Plates that use 31 / 32

Same number, other makers

31 / 32 on Bryant is not the same code on these plates.