Goodman, Amana, Daikin GMVM96 error code b5
Blower motor locked rotor
Goodman is the platform name, and your unit may not say it
Amana AMVM96 / ACVM96, Daikin GMVM96 platform are the same board with a different badge, so this page covers all of them. The fault, the checks and the parts are identical, which is why there is one page rather than one per brand.
Which models this applies to. This page covers the Goodman and Amana GMVM96, GMVM97, GCVM96 alphanumeric codes.
Quick answer
On Goodman GMVM96 (2010s), b5 is a fault. It means blower motor locked rotor. A first thing to check: Seized motor bearings.
- Applies to
- Goodman GMVM96
- Goodman and Amana GMVM96, GMVM97, GCVM96 alphanumeric codes · Furnace · 2010s
- Type of code
- Fault
- Urgency: Needs attention soon
- First safe check
- With the power off, try turning the wheel by hand. If it will not turn at all, the motor is seized.
What b5 means on this model
The control tried to start the motor and it seized on the spot. Current surged past the trip point and the circuit locked out. This is a hard motor failure, not something that will clear itself.
Symptoms you will notice
- Nothing moves at all when the system calls
- Code appears immediately
- Possibly a hum at the moment of the call, then silence
Common causes
The code tells you what the control detected, not which part failed. These are the causes we see most often, roughly in order of likelihood:
- Seized motor bearings
- Motor age, often well past service life
- Blower wheel jammed by debris
- Failed capacitor that locked the motor on start
- Water or corrosion inside the motor after a leak
What you can safely check
These are homeowner-level checks. None of them need you to open a live electrical compartment or work on gas.
- With the power off, try turning the wheel by hand. If it will not turn at all, the motor is seized.
- Check for a capacitor failure, since that is cheaper than a motor.
Do not do these
- ×Do not keep resetting. A locked rotor puts maximum stress on the motor and the control output.
When to call a technician
Book a technician, do not keep resetting it
This fault will not clear on its own. Every power cycle gives the control one more failed attempt, and repeated attempts are what turn a cheap part replacement into a seized or contaminated system.
- This is a fuel-burning appliance, so treat anything involving a burner, gas valve or flue as technician work. If you smell gas at any point, leave the property and call the gas utility from outside rather than continuing to diagnose.
- If the appliance has stopped mid-cycle, is making a noise you have not heard before, or smells burnt, stop reading here and call. Those are symptoms of something the fault code does not describe well enough.
Motor replacement on a gas furnace is technician work.
What it costs to fix
Parts
Motor $250 to $500. Capacitor $15 to $40 if that turns out to be the real cause.
Labor
Three to five hours on a gas furnace.
DIY or technician
Motor replacement on a gas furnace is technician work.
Typical US part and labor ranges, 2026. They vary by region, model and contractor, so treat them as a planning figure, not a quote.
Scope of this code
- Code table
- Goodman and Amana GMVM96, GMVM97, GCVM96 alphanumeric codes
- How this model reports the code
- Printed on the control display
- Models in scope
- Goodman GMVM96, 2010s
- Checked
- Confirm on your own unit
- Find the model number on the data plate, then check this code in the service manual for that model. Manufacturers revise code tables between model years, and a revised board can renumber a fault.