FAQ:Why is the Lenz LH90 showing ERR 03 when trying to consist?
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ERR 03 when attempting to create a consist is often a result of not having control of the locomotive. Review the manual for the consisting process.
Another cause is mismatched firmware versions between the throttle and command station. Older systems which have been upgraded may also exhibit this. One solution is to attempt a system reset using another LH throttle.