Beginning in software revision 13B57, the ASLLC has a default setting to disable free cooling when a dirty air filter alarm (A15/16) is triggered. For software revisions prior to 57 and for instructions on disabling free cooling completely, see below.
Instructions:
1) Turning off Free Cooling (FC) when filter alarm is triggered (recommended for ASLLC software revisions prior to 57)
1. Press UP and DOWN together to display indoor temperature (main menu)
2. Press UP until SET is displayed on screen
3. Press DOWN and SEL at the same time, the screen should display 0
4. Change to 6 and press SEL, the screen should display L01
5. Press UP until you get to L05 and press SEL, the screen should display F01
6. Press DOWN until you get to F24 and press SEL, the screen should display no
7. Press UP to change to Yes, and press SEL, the screen should return to F24
8. Press UP and Down together to return to indoor temperature (main menu)
2) Completely disabling Free Cooling (FC)
1. Press UP and DOWN together to display indoor temperature (main menu),
2. Press UP until is displayed on screen
3. Press DOWN and SEL at the same time, the screen should display 0
4. Change to 6 and press SEL, the screen should display L01
5. Press UP until you get to L05 and press SEL, the screen should display F01
6. Press DOWN until you get to F03 and press SEL, the screen should display Yes
7. Press UP to change to no and press SEL, the screen should return to F03
8. Press UP and Down together to return to indoor temperature (main menu)
reference CS Bulletin 2014_May: Disabling Free Cooling