Goodman GMVM97 furnace code b6: Blower Voltage or Temperature Trip
Professional repair
What does b6 mean on a Goodman GMVM97 furnace? Over/under line voltage to the furnace, or the motor exceeded its temperature limit.
Before you touch anything: the six signs that mean stop troubleshooting and call a pro →
Supply-voltage check first.
What causes it (in order of likelihood)
- High/low AC line voltage; overheated motor TECH
Parts for this code
No specific part number is verified for this code — it typically points at wiring, power, a blown fuse, or communication between components rather than one standard replacement part. If your diagnosis does land on a replaceable component, match its part number against your model's parts list before ordering.
Questions about this code
What does b6 mean on a Goodman GMVM97 furnace?
Over/under line voltage to the furnace, or the motor exceeded its temperature limit.
How do I fix Goodman GMVM97 furnace code b6?
Voltage testing is technician work, so don't test it yourself. A technician should check supply voltage first.
How much does it cost to fix Goodman GMVM97 furnace code b6?
Cost depends on whether the issue is supply voltage or an overheated motor. Supply-side and motor problems involve different work and possibly different trades.
Applies to
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 · page updated 2026-10-03 · how we verify
Related Goodman furnace codes
These codes use the same modulating furnace (gmvm97) — dual 7-segment display system.
| Pattern | Meaning |
|---|---|
| b5display b5 | Blower Locked Rotor (b5) |
| b7display b7 | Incomplete Parameters Sent to Motor (b7) |
| b4display b4 | Blower Current Trip or Lost Rotor (b4) |
| b9display b9 | Low Indoor Airflow (b9) |