FieldBench
Bryant codes

Bryant

COMM

Lockout

ABCD / outdoor drop

ComfortBridge data pair only. Invalid as a diagnosis on a 24V Y1/Y2 hookup.

Walk COMM in Diagnose

5 plates — walk the one on the cabinet

On the plates

  • R to C. A/B polarity. D is not W.
  • 926T + this stat is the wrong bus.
  • ABCD, outdoor board power, inverter comms harness.
  • One control on the bus.
  • 59TP6 + this stat is the wrong bus — load 59TP6, not this plate.
  • ABCD landing and polarity, outdoor board power, inverter comms harness.
  • C still required at the wall control.
  • Indoor must be Infinity-capable. A 24ACC6-style indoor pairing is the wrong mental model.

Plates that use COMM

Same number, other makers

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