Bobcat 753 M5721 Error Code
M5721 Error Code
Auxiliary Control Switch Out Of Range High is the main cause of M5721 error.To solve M5721 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 753 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.