Today I arrived on site to address the heating malfunction. Troubleshooting & Diagnosis: Identified the thermostat displaying error code 126. Determined the error was related to a tripped high limit switch on the Heating and AC systems. Resolution: Adjust the gas flow entering the heater exchange. The gas flow was very high. I ran the system for about 30 minutes straight. The system did not present faults or malfunction after making the combustion adjustment of the unit. Explain to the customer that if the fault reappears, it will be necessary to replace the high limit. The system was left working properly on this occasion. -/-/-/- - Richard addressed the customer's issue with the heating system, which was showing a high heat cycle active message. - Richard suggested potential causes such as airflow restriction, closed air vents, or high gas consumption. - The customer mentioned resetting the system, but the issue persisted. - Richard adjusted the humidity level from 35% to 45%