Derek Cole explains why HVAC capacitors fail: swelling, bursting, power loss, and lightning damage. Regular maintenance catches degraded capacitance before it drops below 5% of design specs and prevents system failure.
When its capacitance/value drops below about 5% of its designed value.
After you get years and years of wear and tear and them running with a motor, you will typically see them start, lose their value and feel they can fail in multiple ways. They can swell and bust or they can just lose their power and not start or let the system run like it needs to. They also can fail if that motor is running during a lightning strike or a power surge. That incoming voltage can throw these capacitors off and need to be replaced.
Is there a good way to prevent these from going out or can you?
Well you're really not a way that you can actually prevent them, but you can help catch that problem before it turns into an issue. To where you don't have air conditioning routine maintenance. If you have regular routine maintenance, your system checked right like it needs to be, you can catch these when they start to lose their value. You do not want to see this value go below about 5% of what it's designed to do before you start changing them out.
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