Hello all from a forum newbie! I searched the forum to see if I can piggy back on someone else's Disco II posts about air conditioner fault codes. I couldn't find any so I'm posting here for future reference to help others. I completed the air con diagnostics check on my 2001 Disco SE by following these steps from this video Land Rover Discovery II A/C Diagnostics : 1 - Turn ignition OFF. 2 - On the climate control panel, press and hold both AUTO and Air Distribution buttons. 3 - While holding these buttons down, switch ignition ON to position 2. 4 - Keep holding the buttons for 4-5 beeps and let go. The fault code (FC) results will be shown on the right side of the screen. After doing this check I had two fault codes that popped up on the screen; 21 & 22. I did a Google search and found a list of the fault code descriptions: 00 - no faults 11 - in car temp sensor fault 12 - ambient sensor fault 13 - thermistor fault 14 - heater coolant sensor fault *21 - left sunlight sensor fault - open or shorted *22 - right sunlight sensor fault - open or shorted 31 - left servo motor 32 - right servo motor 33 - distribution servo motor I did another Google search about the 21 & 22 errors and found the answer on an Australian LR forum. Someone stated that you will get fault codes 21 & 22 if you don't do the test in direct sunlight. It made sense since I did the diagnostics check in darkness of my garage. After reading this, I pulled my Disco out of the garage, let it sit in the Georgia sun for an hour, redid the check and BAM! I got the no fault code of 00! I hope this helps others! Cheers!