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Mast Seres - Servce & Parts Manual
May 2021
Secton 11 - Control System
61
Motor Controller Sensor
Fault
All Models
Check drive motor and wiring, check motor
controller wiring, change option code, replace
motor controller
62
Motor Controller Hardware
Fail Safe Fault
All Models
Cycle power, check brake switch functionality and
wiring, tighten drive motor connections, replace
motor controller
63
Motor Controller Output Fault
All Models
Cycle power, tighten drive motor connections,
replace motor controller
64
Motor Controller Fault
All Models
Replace motor controller
65
Motor Controller Throttle
Fault
All Models
Check wiring to controller, replace motor controller
66
Motor Controller Reverse
Fault
All Models
Replace motor controller
67
Motor Controller HPD Fault
All Models
Check contactor, change option code, replace
ECU, replace motor controller
68
Low Voltage Fault
All Models
Check battery voltage, check battery connection,
load test batteries, replace batteries ONLY if
necessary, charge machine
69
High Neutral Current Fault
All Models
Motor controller thinks the brakes are on and the
motors are still running (this message comes just
before other faults, should be ignored in those
cases), replace motor controller
70
Steer Input Out Of Range
All Models
Check for loose connection at motor controller,
replace motor controller
71
Motor Controller Main
Contactor Fault
All Models
Check wiring to contactor (check white & black
for connection & voltage), check drive motor and
wiring, check motor controller wiring
72
Motor Controller Over
Voltage Fault
All Models
Check battery voltage (battery charger must NOT
be connected), cycle power to machine, replace
motor controller
73
Motor Controller
All Models
Drive or lift motor may be overheating (let the lift
cool down), cycle power to machine, replace motor
controller
74
Motor Controller Motor Fault
All Models
Check connections to motors, check wiring to
motors, cycle power to the lift, replace motor
controller
75
Motor Controller Pump Motor
Fault
All Models
Check connections on pump motor, tap on pump
motor (brushes possibly stuck), cycle power to
machine, replace pump, replace motor controller
76
Motor Controller Left Drive
Motor Fault
All Models
Check drive motor terminals, cycle power to the lift,
replace motor controller
77
Motor Controller Right Drive
Motor Fault
All Models
Check drive motor terminals, cycle power to the lift,
replace motor controller
78
Pump Motor Short Fault
Should Be 0.8 To 1.4
Ohms
•
All Models
Check connections on pump motor, tap on pump
motor (brushes possibly stuck), cycle power to
machine, replace motor controller
79
Left Drive Motor Short
Should Be 0.5 To 2.0
Ohms For Micro19
•
1930SE ONLY
Check left drive motor terminal, check motor
controller wiring
Micro19®
Swap drive motor wires (if code changes trace
wiring, if it does not replace motor controller),
tighten drive motor terminals
