How to Test an HVAC Motor Capacitor | Spec. Sense

Is your furnace or AC motor not starting? This video shows how to safely discharge and test a capacitor with a multimeter. Capacitors are used to energize the start winding in single phase motors. Capacitors can weaken or fail over time which can prevent the motor from running properly. Capacitor testing can help determine if the capacitor still operates within its rated capacitance.

In this episode of Spec. Sense, you'll also learn how capacitors work, what the capacitor ratings mean (MFD / uF) and the differences between a start capacitor, run capacitor, and dual run capacitor.

Buy Run Capacitors: amresupply.com/catalog/Capacitors-Run-635293-MG…

Buy Start Capacitors: amresupply.com/catalog/Capacitors-Start-635294-…

Need a replacement motor? Find a match here: amresupply.com/catalog/Motors

More videos:
The Complete Guide to Matching a Motor: youtu.be/3eOARJ8oRrc
How Do HVAC Motors Work?: youtu.be/vpspMVQQXRs
How to Replace a Furnace Motor: youtu.be/4SY8lRl8HV0
Furnace Troubleshooting Playlist: youtube.com/playlist?list=PLCo9SMjkdWBywFI_qcK_…

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00:00 Intro
01:11 Capacitor Ratings
02:40 Capacitor Discharging
03:29 Capacitor Testing

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