Arrived to find system shutting down due to bad flame sensor and dirty filter. Filte is an outdated electronic one with pre-filter that is an odd size so ill send some info and an estimate for possible replacements. Flame sensor was changed and all other components were checked. System is a zoned carrier with infinity touch thermostat which makes it difficult to change blower speed but high static due to lack of bypass is also a possible issue. Can confirm heat is running at this time but we need to monitor due to airflow issues.