I have a gs 1930 with the LL code. I did what the troubleshooter said. Locate the red wire with level sensor hooked up. check for 24 volts. No voltage. Ground. continuity good. all the way back to A-5 at the ECM. Says replace ecm. I did and have the same code. I bypassed the level switch. still ground on red wire. I cut the wire at a-5 and added 24 volts. LL code went away while 24v is applied. but 18 code came up. I checket the limit switches at both pothole guards. working perfectly. Someone please help me. this is the only Genie we have and I am stumped.