Glad you got it sorted.

My printer was from an early production run and as far as I know on mine there is no way to heat the chamber other than by the bed warming.
I run my bed at 95 and my nozzle at 245 for ASA and no fan on.

The one sure way I found to make warped prints was to open the door as soon as the print finishes, I now wait until everything is down to ambient temperature before opening the door.