Schneider Electric
Short Cycling Due to Control Settings or Fault
Thermostat causes short-cycling: HVAC turns on and off very frequently.
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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
Differential or cycle rate set too tight, Oversized HVAC equipment, Sensor placement causing rapid temperature swings, Stuck or bouncing relay contacts
How to Fix / Troubleshooting
Safety: Frequent cycling can damage compressors; address promptly.
Steps:
- Enter the installer settings and review cycle rate or differential settings. Increase the differential or reduce cycles per hour according to Schneider Electric recommendations for your system type.
- Ensure the thermostat is not directly in the airflow of a supply vent, which can cause it to sense rapid temperature changes; redirect airflow or relocate the thermostat.
- Listen for chattering or rapid clicking from the thermostat; this may indicate a failing relay. If present, replace the thermostat.
- If short-cycling persists even with correct settings, consult an HVAC technician to evaluate equipment sizing and other system issues.
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Repair Difficulty
Medium
3/5
Required Part
Thermostat Control Settings / Output Relays
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