Komatsu PC118MR-8 Operation And Maintenance Manual page 286

FUNCTIONING
TROUBLESHOOTING
Telephone contact in case of error 3
If the monitor displays an error screen, a telephone number is
shown on the same window.
REMARK
If there is no number registered, no number will be displayed.
The telephone number must be registered; therefore, request
your Komatsu distributor to do it.
3-202
WEAM014802