Symptoms
- Compressor starts, runs briefly, then stops repeatedly
- Cycle length is much shorter than normal (which is usually many minutes)
- Freezer struggles to maintain temperature
- May be accompanied by clicking sounds
Likely causes
- CommonFailing start relay or overload protectorThese components can trip prematurely, cutting power before the compressor properly starts.
- CommonCompressor overheating and tripping its internal protectorDirty condenser coils or poor airflow can cause the compressor to overheat and shut down repeatedly.
- PossibleLow refrigerant causing erratic pressure readingsA slow leak can cause the system to behave unpredictably, including short cycling.
- Less commonFailing compressor windingsInternal motor damage can cause it to start and immediately trip off repeatedly.
What to do
- Unplug the unit and clean the condenser coils thoroughly, since overheating is a common and fixable cause.
- Ensure adequate clearance around the unit for heat to dissipate.
- Plug the unit back in and time how long the compressor runs before shutting off.
- Avoid repeatedly power cycling the unit manually, which adds stress to an already struggling compressor.
- This issue involves electrical testing of the relay, overload protector, and refrigerant system, which requires a professional.
- Have a technician diagnose it soon, since prolonged short-cycling can permanently damage the compressor.
Tools and parts
- Vacuum with brush attachment
Compressor start relay and overload protectorSearch: “refrigerator compressor start relay overload protector”
When to call a pro
Rapid short-cycling should be diagnosed by an appliance technician soon to avoid permanent compressor damage.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.