Question 1

What does Mantis fault code Code 10 mean?

Accepted Answer

Code 10 (Greer / LMI): LMI screen displays "Communication Error"; All safety lockouts active. Fix: CAN Bus Communication Timeout.

LOGIC: The display console in the cab has lost contact with the Interface Box (usually located behind the seat or in the electrical cabinet).

ACTION: 1. Check the main data cable between the cab and the logic box. 
2. Check for a blown "LMI Power" fuse.

FIX: Replace the communication cable or the main Interface Board.

Question 2

What does Mantis fault code Error 01 mean?

Accepted Answer

Error 01 (Rayco Wylie LMI): All crane functions (hoist, telescope, boom down) are cut off; Audible alarm. Fix: Boom Angle Sensor Signal Out of Range.

LOGIC: The LMI is receiving a voltage from the angle sensor (potentiometer) that is higher or lower than its calibrated "Home" or "Max" positions.

ACTION: 1. Inspect the angle sensor box on the side of the boom. 
2. Check for loose mounting bolts that let the sensor rotate.

FIX: Re-align the sensor or replace the internal potentiometer.

Question 3

What does Mantis fault code Error 02 mean?

Accepted Answer

Error 02 (Rayco Wylie LMI): Load reading is frozen or shows ""; Lockouts may engage. Fix: Pressure Transducer Fault (P1 or P2).

LOGIC: The LMI calculates load by measuring hydraulic pressure in the boom hoist cylinder. Error 02 means the "Rod-Side" or "Piston-Side" sensor is disconnected or dead.

ACTION: 1. Check the 2nd/3rd transducers on the lift cylinder. 
2. Verify the cable is not pinched by the boom cylinder pins.

FIX: Repair the shielded cable or replace the 4-20mA pressure transducer.

Question 4

What does Mantis fault code M01 / M02 mean?

Accepted Answer

M01 / M02 (Mantis Logic): Crawler tracks move slowly or not at all; Engine doesn't "rev up" when traveling. Fix: Travel High/Low Solenoid Fault.

LOGIC: The machine controller is attempting to shift the travel motors into high-speed mode but detects an open circuit in the solenoid coil.

ACTION: 1. Locate the travel solenoids near the swivel. 
2. Ohm-test the coils (should be 20-40 ohms).

FIX: Replace the Travel Speed Solenoid Coil or repair the harness at the swivel.

Question 5

What does Mantis fault code Over-Hoist (ATB) mean?

Accepted Answer

Over-Hoist (ATB) (General LMI): Winch stops hoisting; Boom cannot telescope out; Alarm active. Fix: Anti-Two Block (ATB) Circuit Open.

LOGIC: The safety loop is broken. The weight has either been lifted by the hook block, or the wire is broken.

ACTION: 1. Ensure the ATB weight is hanging free. 
2. Check the "dead-end" wire on the boom tip.

FIX: Repair the broken ATB wire or replace the microswitch in the boom-tip box.

Mantis Fault Codes

Ready to take control of your fleet maintenance?

Other manufacturers

Code	System	Symptom	Full fix
Code 10	Greer / LMI	LMI screen displays "Communication Error"; All safety lockouts active.	View fix
Error 01	Rayco Wylie LMI	All crane functions (hoist, telescope, boom down) are cut off; Audible alarm.	View fix
Error 02	Rayco Wylie LMI	Load reading is frozen or shows ""; Lockouts may engage.	View fix
M01 / M02	Mantis Logic	Crawler tracks move slowly or not at all; Engine doesn't "rev up" when traveling.	View fix
Over-Hoist (ATB)	General LMI	Winch stops hoisting; Boom cannot telescope out; Alarm active.	View fix