Upon arrival had kitchen zone thermostat call for heat inspected Kitchen/Living room Air Handler in kneewall closet. Did not hear system turning on. Switch thermostat to call for fan only. Did not hear fan engaged. Checked Argo zone panel. Notice no indicator lights @ panel. Check terminals no voltage @ terminals. Check Service switch. Was not receiving a 120volts @ service switch Check Control board between Line and Neutral. No power @ board or service switch. Showing problem is on the electrical side. Locate electrical breaker panel, found breaker for kitchen/ living room zone tripped Reset breaker @ panel. System is back up and running. Inspected electrical wiring to find the cause of why breaker was tripped in the 1st place. Immediately notice that fan blower motor was making abnormal noise. Fan motor then began to slow down and then completely stopped. Shut power to equipment and checked fan booster to verify if booster was failing cause fan not to operate correctly. Standard Ele