If you already have a manual (physical or digital), follow these steps to verify it.

All verified LCB II manuals include a specific warning on Page 2 or 3:

“WARNING: This controller contains high voltage (up to 480 VAC). Capacitors can hold charge for 10 minutes after disconnection. Always short diagnostic points DP1-DP2 before servicing.”

If this exact or equivalent language is missing, the manual is likely incomplete.

The LCB II stores floor heights, speed profiles, and car call cancellations in NVRAM backed by a lithium battery (typically CR2354). A verified manual includes the "RAM Retention Time" table: how many minutes you have to swap the battery before losing all floor data. This ranges from 5 minutes on early boards to 30 minutes on later revisions. If your manual is not verified for that specific board revision, you will lose your floor profile and require a full re-teach (which itself demands a verified manual to perform the step-by-step "learn run").

When you have a manual in hand (digital or print), follow this verification protocol:


Disclaimer: This article is for informational purposes only. Always follow local codes and manufacturer-specific verified documentation when servicing elevator equipment. The author is not liable for misuse of any technical procedures mentioned herein.


The Otis LCB II is a microprocessor-based controller for hydraulic elevators (primarily low- to mid-rise). It replaced the earlier LCB I and is found in Otis HydroFit, 211, and some GEN2 hydraulic applications. Key features include:

Verified: The LCB II uses a 12V DC logic supply. Never probe pins with a multimeter in resistance mode while powered—static damage is common.