Hey guys. Been a while.
Anyway my friend just told me that one of the XL16i's I installed last year in California has error code 79 on the display.
I don't have the book and I don't work on residential anymore (or even out in the field) to be familiar with it.
I tried to search the internet but no luck. I see err 80 is High Pressure Cut Out. Maybe this is LOW pressure?
I wish I would have kept one of the manuals. :-/