GOODMAN DIAGNOSTIC REFERENCE MODULATING FURNACE (GMVM97) — DUAL 7-SEGMENT DISPLAY DOC GOODMAN-GMVM97-B7

Goodman furnace: Incomplete Parameters Sent to Motor (b7)

Incomplete Parameters Sent to Motor (b7). The control failed to deliver a complete parameter set to the ECM — a control-side error.

b7 YOUR LIGHT: DISPLAY CODE B7 — MATCH IT ABOVE

Professional repair

What does b7 mean on a Goodman GMVM97 furnace? The control failed to deliver a complete parameter set to the ECM — a control-side error.

Control and shared-data reload. DIY part cost: $80–180 — a pro visit for this class of fault typically runs $150–350.

What causes it (in order of likelihood)

PCBBF112S — Integrated Control Board

$80–180 · also sold as PCBBF123S, 50A55-743

Always match parts against your model's parts list — part numbers vary within a series.

GMVM97

Different Goodman generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.

Verified against Goodman GMVM97 Service Manual, p.67/68

Last verified 2026-07-06 · how we verify

These codes use the same modulating furnace (gmvm97) — dual 7-segment display system.

Pattern	Meaning
b6	Blower Voltage or Temperature Trip (b6)
b9	Low Indoor Airflow (b9)
b5	Blower Locked Rotor (b5)
d0	Data Not Yet on Network (d0)