CCU IO Low Sensor Voltage

The CCU_IO sensor supply voltage is below 4.5V, and the unit says see manual.

The voltage supply for the sensors on the CCU_IO is below the low voltage limit (4.5V). Only to be checked if there is a sensor connected to the supply. Alarm Reset The voltage supply for the sensors on the CCU_IO is above the high voltage limit 4.5V Alarm Condition Only 1. Check HVAC System Values in CabinTech for any sensor values that are out of normal operating range. If readings are not within normal range, check wiring to that sensor for open circuit and short to power. 2. Check CCM 12 VDC Power Supply Circuit – Check input voltage between J6-1 and J6-2. Inspect APU/CCU interface harness. 3. Replace Climate Control Module – Copy configuration file using CabinTech and replace CCM. Refer to section X for CCM replacement instructions.

See manual.

See manual.