Went for a maintenance call today for heat. Tested for static pressure system is passing when in heat. All electrical components are passing for manufacture specifications. Did a combustion test is within range. Inspected heat exchanger no cracks/leaks were detected. Did inspect blower wheel is building dust on blower wheel recommend a blower cleaning. As well adding a uv light to help remove biological growth on humidifier. Checked temp split and is passing for specifications. Did replace filter for customer. Cleaned flame sensor and pressure switch hose. System is up and running before departure. Thank you for choosing LBA services-Johann