FieldBench
Amana codes

Amana

Comm

Lockout

Indoor/outdoor data

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

Walk Comm in Diagnose

3 plates — walk the one on the cabinet

First check

1 Data pair, not 24 V

On Amana ALXT7C indoor/outdoor comm is a data pair (AB, S1/S2, U, ComfortBridge, ComfortLink — whatever THIS plate uses). It is not a 24 V Y. Check polarity, continuity, and that nobody landed it on R/C. Data pair polarity and splices. This is not 24V Y.

Expect: Pair continuous, not shorted to chassis, polarity per the diagram.

The rest of the walkthrough is Diagnose.

On the plates

  • Data pair polarity and splices. This is not 24V Y.
  • Indoor IFC family must be GMVC / AVPTC communicating. GR9T96 / GMEC96 / GMSS96 cannot be the ComfortBridge indoor.
  • One master on the bus. Outdoor board power before you condemn the indoor IFC.
  • 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 Amana is not the same code on these plates.