Tempstar
Failed Start/Run Capacitor
Tempstar air conditioner outdoor unit hums but fan and compressor do not start
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open or weak dual run capacitor, Loose capacitor terminals, Failed compressor or fan motor drawing excessive current
How to Fix / Troubleshooting
Safety first: Turn OFF power at the outdoor disconnect and main breaker. Capacitors store high voltage; do not touch terminals unless trained to discharge safely.
Steps (visual only for homeowners):
- 1. Remove electrical panel: Access the control compartment of the Tempstar condenser.
- 2. Inspect capacitor: Look for bulging top, leaking oil, or rust. These signs indicate failure.
- 3. Check connections: Ensure wires are firmly attached and not burned.
- 4. Do not bypass: Never bypass a capacitor or jump terminals.
- 5. Call a technician: Have the capacitor tested and replaced with the exact microfarad and voltage rating specified by Tempstar.
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Repair Difficulty
Hard
4/5
Required Part
Dual Run Capacitor
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