Tech was out for no heat. Unit did not have filter tech provided filter 14x25x1 at no cost. Put system in heat mode System will fire up for 20 sec then shut off. Tech cleaned flame sensor and started system. Again system will run 20 sec then shut off. Checked mirco amps to verify if flame sensor is good. Tested ( passed ) 2.6 MA…. Tech tested voltage come from flame sensor and was reading 15. This indicates failed board. Unable to access back of unit to take pictures due to a big pipe blocking evap coil. There is no drain pan under home. No safety switch. There is a condensation pump with no pan Checked out door unit found failing capacitor and out door unit is needing a chemical cleaning. Spoke with customer about issues. Customer stated that she just had that board replaced by some one and she is going to reach out to that person to come fix. At this time system is not operating.