Bobcat 863 12-21 Error Code
12-21 Error Code
Auxiliary Pwm Switch Out Of Range High is the main cause of 12-21 error.The condenser converts gases into liquids, which expels heat from your rig. Materials can build up over time, causing a layer of dirt and grime to form on the condenser's coils. Your AC system will only blow hot air since the refrigerant fails to cool down.
Tip For 863 Model
Do not use the bucket as a breaker or pile driver. It is
better to excavate hard or rocky ground after breaking it
with other equipment. This will reduce damage to the
Do not move the excavator while the bucket is in the ground.
Dig only by moving the boom and arm toward the excavator.
Do not back dig (digging by moving the boom and arm away from the excavator). Damage to the quick coupler and attachments can occur.