Customer turned the system on and the air handler did not start. Chlorine power. The digital display was blank. The fuses were good and there was 24 volts. The digital display is bad. Removed the display from an unused ahu, the error was “ blower communication error”. There was 240 volts at the motor. Tried jumping out the power to the module, nothing happened. The lower motor is bad. Removed the blower assembly from an unused ahu and installed it in the bedroom air handler. Turned power on and the blower started properly. Need to replace the display module and the blower motor on the unused air handler.