FieldBench
Goodman codes

Goodman

b2 / b3 / b9

Protect

Motor HP / limiting / low CFM

b2 = motor HP does not match the shared-data set. b3 = motor folding back on power/speed/temp. b9 = airflow below calculated minimum.

Walk b2 / b3 / b9 in Diagnose

Sign in for the next measurement

First check

1 Read the plug / card on THIS cabinet

On Goodman GRVM97 the model plug or shared-data card must match this cabinet size. A 100 kBtu plug in an 80 cabinet overfires and limits. A leftover memory card after a control swap throws d0/d4-class codes. Correct AMVM97 motor and memory card.

Expect: Plug / card part matches the rating plate and the replacement control bulletin.

The rest of the walkthrough is Diagnose.

On the plates

  • Correct AMVM97 motor and memory card.
  • Static, filter, coil. CFM follows modulating rate — a brick duct still b9s.
  • Wrong CoolCloud outdoor type / CFM table.

Plates that use b2 / b3 / b9

Same number, other makers

b2 / b3 / b9 on Goodman is not the same code on these plates.