Signs of a failing capacitor
- A humming outdoor unit with a fan that does not spin, or that starts if nudged.
- Clicking at the outdoor unit followed by nothing.
- The system starting hard, with a noticeable groan before the compressor picks up.
- Cooling that works intermittently and gets worse as the afternoon heats up.
- A visibly bulged or leaking capacitor top, sometimes with an oily residue.
Why heat is the main enemy
Capacitors degrade faster at high temperatures, and Tallahassee summers deliver months of high ambient heat plus long runtimes. A capacitor that would last a decade in a mild climate may fail in a fraction of that here.
Dirty condenser coils compound the problem by raising operating temperatures inside the unit.
Why this is not a DIY repair
Capacitors hold a charge after power is removed and can deliver a serious shock even with the disconnect pulled. Correct service also means verifying the microfarad rating under load, checking the contactor and motor windings, and confirming that something else did not cause the failure.
Replacing a capacitor without checking why it failed often results in a repeat call within the same season.
What a service visit typically includes
- Safely discharging and testing the existing capacitor against its rating.
- Inspecting the contactor for pitting and the wiring for heat damage.
- Measuring motor amp draw to see whether a motor is dragging the capacitor down.
- Checking condenser coil cleanliness and overall system pressures.
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Frequently Asked Questions
It is not advisable. Capacitors store energy and can shock you after the power is off, and an incorrect rating or an undiagnosed root cause leads to repeat failures.

