Came for no heat. Call. When arrive to costumer house system had power but it was cycling on and off until shuts down. When testing system found that filter and evap coil were clogged for lack of maintenance and there was also biological growth inside the system spreading, causing poor air flow and system to over and finally shutdown. Proceed to do a complete maintenance, chemically clean evap coil. Added new transformer and UV germicidal light to avoid bio growth to come back and spreading. Costumer also signed up for monthly membership, to keep up with hvac maintenance to avoid any further issues. System is now up and running. Thank you for choosing TE Certified!