I have a Trane XR15 purchased in 2010 with air handler 4TEE3C05A1000AA built in 2009. The handler has a variable stage fan. I noticed that the float switch was not turning off either the outside compressor or the air handler fan. The original installer came by and changed the safety float switch as well as the air handler module and fan motor. Now the float switch will shut down the compressor but still does not shut the air handler fan as it continues to run regardless of how long we wait. Does anyone know if this particular trane unit is designed to only shut the compressor and not the air handler fan? Thanks all.