b0 Blower motor not running

What the control is telling you

The blower should be running but it is not. Furnace will not run. ComfortNet thermostat shows MOTOR NOT RUN b0.

Applies to: GMVC95/AMVC95 upflow and *CVC9 counterflow two-stage furnaces

Likely causes

• Loose or unplugged motor power leads
• Open inductor or loose inductor wiring (3/4 hp and 1 hp models only)
• Failed blower motor

Test and repair steps

1. Safety turn power off before working on the control or wiring.
2. Check the motor power plug and leads and tighten them.
3. On 3/4 hp and 1 hp models, check the inductor for continuity. Replace it if open or shorted.
4. If power is reaching the motor and it still does not run, replace the motor with the correct part.

Settings for these units

• Normal status displays (7-segment) · Goodman/Amana GM9S96/AM9S96
• Normal status displays (7-segment) · Goodman/Amana GM9S80/AM9S80
• Normal status displays (7-segment) · Goodman/Amana GM9C96/AM9C96
• Minimum recommended filter size · Goodman/Amana GM9C96/AM9C96

Models that show this code

10 models in Goodman/Amana *MVC95/*CVC9 two-stage ComfortNet

Other codes on the same units

• 88 Power-up self check
• b1 Lost communication with blower motor
• b2 Blower motor size does not match model data
• b3 Blower motor limiting (power, temperature or speed)
• b4 Blower motor trip (lost rotor control or high current)
• b5 Blower motor locked rotor
• b6 Blower motor over/under voltage or over temperature
• b7 Blower motor missing parameters