I know this is an old post,but I wanted to something to it.
When this code appears,the first thing to check is the battery. Make sure that the water is at the correct level. I have been on many a service call for lift interrupt and the customer "just took it off charge". You find the battery dry and hot. Add water as needed and put the unit back on a equalize charge. Provided the battery is in good shape,you should not hear from the customer again.......or at least until the battery gets low again