Question
We have an Irritrol HR 6100. I'm attempting to set it up for this season, and after I've programmed it and move the switch to "run" I get an error code of "2A" flashing. Can you please tell me what this means? What have I done wrong?

Answer
Hey Kathryn, I would check valve #2 solenoid , and see if  it is shorting out he controller. Also I've never heard of irritrol making a 6100 controller. Hydro Rain used to manufacture this controller, but I can never remember it giving you error codes. You might want to check and see if this is the correct controller. Good luck and have a great day.