Stop the Start-Stop Cycle
Short cycling is the 'silent killer' of HVAC compressors and heat exchangers. Identify why your system can't stay on long enough to finish the job.
Primary Causes & Explanations
Restricted Airflow
40% Prob.Dirty filters or closed vents cause temperatures to spike (in heat) or drop (in cool), trippping safety limits almost immediately.
Oversized Equipment
25% Prob.A system that is too powerful for the space will reach the setpoint too quickly, leading to frequent on/off cycles.
Low Refrigerant Charge
20% Prob.Low pressure can trip the low-pressure cutout switch, shutting the system down to protect the compressor.
Thermostat Placement
15% Prob.If the thermostat is under a supply vent or in a drafty area, it gets false readings and cycles the system prematurely.
Standard Troubleshooting Protocol
1
Verify air filter cleanliness and ensure at least 80% of supply vents are open.
2
Check the thermostat location for heat sources (lamps, sunlight) or cold drafts.
3
Measure the runtime: If it's less than 10 minutes, it's officially 'short cycling'.
4
Inspect the evaporator coil for icing.
5
Check control board for safety limit trips (High Limit, Roll-out, or Pressure switches).
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