I arrived at the customer's home to perform gas furnace maintenance. I completed the checklist and found that the unit was working properly. I tested the thermostat, checked the air filter, and cleaned the burners. I also checked the gas pressure and adjusted it if necessary. I tested the ignition system and replaced the air filter if it was dirty. I also checked the blower motor and cleaned it if necessary. I tested the safety controls and made sure they were working properly. I also checked the electrical connections and made sure they were secure. I tested the fan and made sure it was running properly. I also checked the venting system and made sure it was clear. I tested the thermostat and made sure it was working properly. I also tested the gas valve and made sure it was working properly. I also checked the combustion chamber and made sure it was clean. I also tested the heat exchanger and made sure it was working properly. I also tested the blower wheel and made sure it was runni
