Amana furnace code b7: Incomplete Parameters Sent to Motor
Professional repair
What does b7 mean on an Amana furnace? The ECM blower motor didn't get all the information it needs to operate, an event kept it from running, or it failed to start 40 times in a row. Probable causes in the manual: an intermittent wiring connection between the control and the motor, a furnace control error, or any of the conditions behind codes b4, b5 and b6.
Before you touch anything: the six signs that mean stop troubleshooting and call a pro →
Check the control-to-motor wiring, the furnace control and the motor. DIY part cost: $400–800 — a pro visit for this class of fault typically runs $150–350.
What causes it (in order of likelihood)
- Intermittent wiring connection between the control and the motor TECH
- Furnace control error TECH
- A motor trip, locked rotor or voltage problem (codes b4, b5 and b6) TECH
Parts referenced by this code
Always match parts against your model's parts list — part numbers vary within a series.
Questions about this code
What does b7 mean on an Amana furnace?
The ECM blower motor didn't get all the information it needs to operate, an event kept it from running, or it failed to start 40 times in a row. Probable causes in the manual: an intermittent wiring connection between the control and the motor, a furnace control error, or any of the conditions behind codes b4, b5 and b6.
How do I fix Amana furnace code b7?
Leave the wiring and settings alone. A technician should check the connection between the control and the motor before replacing either one.
How much does it cost to fix Amana furnace code b7?
Cost depends on whether a loose connection, the control or the motor is at fault. Get that diagnosis before anyone quotes a part.
Applies to
AMVC96 · ACVC96
Different Amana generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.
Same control platform, same code: Goodman furnace code b7
Full code lists for the other brands on this control platform: Goodman furnace codes
Verified against Goodman GMVC96/GCVC96 Service Manual, p.46 — “the motor fails to start for (40) consecutive attempts”
Verified against Goodman GMVC96/GCVC96 Service Manual, p.51-52 — “b7 INCOMPLETE PARAMETERS SENT TO MOTOR”
Verified against Goodman Diagnostic Code Identification System (GMVC96, GCVC96, AMVC96, ACVC96; code b7) — “Incomplete Parameters Sent to Motor”
Amana AMVC96/ACVC96 furnaces use the same control board and code map as the Goodman GMVC96/GCVC96 — the cited Goodman service manual is the platform document for both brands.
Last verified 2026-10-19 · page updated 2026-10-20 · how we verify
Related Amana furnace codes
These codes use the same dual 7-segment display (two-stage variable-speed) system.