Eb4 Blower motor lost rotor control or high current

What the control is telling you

The motor sensed loss of rotor control or high current - often caused by a sudden load change or a blocked inlet/outlet.

Applies to: ComfortBridge communicating air handlers AVPTC**14 (B* revision board) and MBVC1201/1601/2001 modular blowers

Likely causes

• Abnormal motor loading or sudden change in speed or torque
• Sudden blockage of the air handler inlet or outlet

Test and repair steps

1. Warning: Turn off power to the air handler before working on wiring or the blower.
2. Check filters, grilles, registers, ducts and the unit inlet/outlet for blockage.
3. Check the blower wheel is secure and free.

Models that show this code

21 models in Goodman/Amana ComfortBridge AVPTC/MBVC

Other codes on the same units

• Eb0 Blower motor not running with a demand present
• Eb1 Control lost communication with the blower motor
• Eb2 Motor horsepower does not match shared data
• Eb3 Blower limiting on power, temperature or speed
• Eb5 Blower motor failed to start 10 times
• Eb6 Blower shut down for voltage or power module temperature
• Eb7 Blower motor missing shared data / failed to start 40 times
• Eb9 Airflow lower than demanded