Furnace Blower Capacitor Symptoms

A faulty capacitor may prevent the blower from functioning at all.

Furnace blower capacitor symptoms. A bad or faulty capacitor can exhibit many signs and symptoms. If your condenser fan motor is running slow it could be a weak capacitor or a condenser fan motor where the bearings are dragging and the motor is on its way out. The humming sounds created by the blower are indications that the capacitor has electrical problems. How to check a run capacitor.

Turn up the thermostat for the furnace and wait for the furnace blower to start up. A bad capacitor can cause the furnace to run too hot internally and may trip a safety switch causing the furnace to shut down temporarily. Fan motors can sometimes run even with a bad capacitor but hidden damage is still happening to the fan motor. Weak or bad capacitors can cause both blower motors and condenser fan motors to run slow.

Read on to know some of them. Capacitor failure symptoms are sometime harder to identify without the right tools and expertise. Open the access panel to the furnace and listen for a relatively loud humming noise. Before checking the capacitor make sure.

Open the access panel. But with a bad capacitor your blower cannot function well and may put your family s comfort at risk. The most common symptom of a bad capacitor is that the motors do not run. If you notice an electrical burning smell when the furnace is trying to start that may be an indicator the electrical wires supplying power to the capacitor are corroded or frayed.

If you hear a clicking sound when the capacitor kicks in that s a problem too. If you hear that sound and it doesn t stop there s an electrical difficulty.