Cycled system heater number 3. on, can’t get it to duplicate sound. Watched video of sound it was very loud. System working for now. Checked fan motor not hot to the touch, fan blades have clearance. System running ok at this time. With system off checked fan blade ok at this time, motor now warm/hot to touch... thinking it’s the fan and motor making the noise. Not going to charge anything at this time. If it happens again call in and we can order a new fan motor.