2004 Lennox high-efficiency single stage furnace — no heat, burning smell reported. Capacitor was replaced in August; upon inspection, capacitor tested OK. Found blower motor tight to spin and not rotating freely. Loosened blower wheel manually and inspected motor. Burning smell was most likely due to blower motor not spinning and the exchanger burning off dust with no air flow. Motor was found to be intermittently seizing due to internal wear. Was able to temporarily free the motor and energize it to complete a heating cycle for further diagnosis. All other components tested within specifications. Recommendation is to replace the blower motor, as continued operation may result in complete motor failure. Office will source the correct replacement and reach out to schedule installation. In the meantime, client will monitor furnace operation and only run heat when home to ensure the blower is operating.