HAAS® Alarm 121 — LOW LUBE OR LOW PRESSURE
Part of: our HAAS® alarm reference · covering 60 of the most common alarms.
What it means
The way lube system has reported either an empty reservoir or no pressure in the lube line. The machine will throttle or stop to protect ways and ballscrews.
Common causes
- Lube reservoir empty
- Lube pump failed
- Lube line broken or disconnected
- Pressure switch faulty
What to check first
- Check the lube reservoir level — top up if empty (use the correct way oil)
- Listen for the lube pump cycling — usually every 20–30 minutes
- Check distribution lines for breaks or oil patches under the machine
Prevention
Cabinet maintenance is the quiet hero. A 5-minute filter clean every fortnight prevents the vast majority of cabinet-temperature and drive-temperature alarms. Replace cabinet filters at the schedule the manual specifies, not when they look clogged — by then they're already restricting airflow.
If you’re still stuck
If you’ve worked through the checks above and the alarm hasn’t cleared — or if it cleared and came back — that’s the point to call. Persistent alarms after a reset usually mean a real component fault, and pushing through them risks turning a simple repair into a bigger one. Keith covers HAAS® breakdowns across the UK with same-day phone diagnosis.
A note on this guide. Alarm wording and numbering can vary by HAAS® machine model and software revision. The descriptions here are written in plain English to help you understand what the machine is reporting and what to check first — they’re not a substitute for the official HAAS® operator manual or for a qualified service engineer’s diagnosis. Always confirm the exact alarm message on your screen and consult your machine’s documentation before attempting any repair.