The freezer cycles on for about 30 seconds and then off for several minutes and the pressure light comes on. I took the cover off of the back and noticed the fins where the coils are, are caked with dust. Is this causing the problem and if so, what is the best way to clean it?
The unit is probably clicking off on overload due to the dirty coil. Try brushing it off and hose it down or lightly blow it out with an air compressor or co2 if available. Be careful not to damage or bend the fins.
If the freezer is not located in an area where grease vapors are present the unit can be cleaned off using a vacuum cleaner. Then use a flash light to look through the coils. If you see dust embedded deep inside use a small air compressor to blow out the dust. Dirty condenser coils raise the pressures and temperatures in the system. Cleaning the coils and scheduling them to be clean at quarterly intervals should keep it functioning for a long time. Operating with a restricted condenser takes its tole on the compressor life span.
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