Diagnosed and resolved issue with 2013 Ruud furnace running continuously and failing to maintain temperature. Identified overheating condition with furnace cycling on limit switch due to severely restricted airflow from dirty filter, compounded by wood fireplace usage. Removed clogged filter which restored proper operation. Installed customer-requested T10 Pro smart thermostat with remote control capability. Tested complete system operation and verified proper functionality. Advised customer about heat exchanger condition and overall furnace age.
