Eb1 Control lost communication with the blower motor

What the control is telling you

The air handler control can no longer talk to the serial communicating blower motor.

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

Likely causes

• Loose motor control (4-wire) connection
• Failed blower motor
• Failed air handler control

Test and repair steps

1. Warning: Turn off power to the air handler before working on wiring or the blower.
2. Check and tighten the 4-wire motor control harness.
3. Check voltages on the 4-wire harness (Specs tab: pins 1-4 and 1-2 about 3.3 VDC, 3-4 about 15 VDC).
4. Replace the motor or the control, whichever is at fault.

Models that show this code

21 models in Goodman/Amana ComfortBridge AVPTC/MBVC

Other codes on the same units

• E0F Condensate switch open - high water in drain pan
• E05 Air handler fuse open
• Eb0 Blower motor not running with a demand present
• Eb2 Motor horsepower does not match shared data
• Eb3 Blower limiting on power, temperature or speed
• Eb4 Blower motor lost rotor control or high current
• Eb5 Blower motor failed to start 10 times
• Eb6 Blower shut down for voltage or power module temperature