From the ladder: MTB FAULT MESSAGE 20: 20 LUBRICATION TIMEOUT
The machine is not satisfying (closing) the lubrication pressure switches within the allotted time, or if they are closing they are staying closed too long.
The switches should close when pressure is built, then maintain a closed state for 15 seconds or so, then re-open.
Manually pump the lube pump a bunch of times, make sure the lube filters are clean, make sure the switches function.
bob@zpsusa.com