Customer has 7 y/o Trane system that operates for whole house. System was not heating due to very dirty flame sensor. Removed and cleaned flame sensor. Tested heating. Noticed that blower wheel is dirty. Recommend water protection upgrade. Recommend iWave-R Air Ionizer to combat dust, eliminate odors and purify air. Informed customer of all findings. System is currently working. Signed up for HomeCare Program for regular maintenance.