Bobcat A770 U109B-A2 Error Code
U109B-A2 Error Code
Rear Controller - System Voltage Low is the main cause of U109B-A2 error.To solve U109B-A2 locate and open the low-pressure valve, then attach the refrigerant to the valve and charge from there. Ensure you use the right refrigerant type and amount, as specified by a manufacturer. It is possible to overcharge the AC, so consider seeking help from a mechanic.
Tip For A770 Model
It is recommended in cold weather to cycle the glow plugs twice before attempting to start the engine. This will allow for additional heating time for cold weather starting.