b2 Blower motor size does not match model data

What the control is telling you

The motor horsepower in the shared data does not match the motor in the furnace. Furnace will not run. ComfortNet thermostat shows MOTOR MISMATCH b2.

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

Likely causes

• Wrong blower motor installed
• Wrong shared data in the control

Test and repair steps

1. Safety turn power off before working on the control or wiring.
2. Check the motor hp is the one specified for this furnace model. Replace if wrong.
3. Check the shared data is for this model. Reload with the correct memory card (insert with power off, power on, power off before removing).
4. The code clears once motor hp and data match.

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
• b0 Blower motor not running
• b1 Lost communication with blower motor
• 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