If you are searching for a walk in cooler or walk in freezer troubleshooting guide, this post should help!
The best guide for a walk-in freezer is a systematic approach for cooler maintenance.
Walk-in coolers or walk-in freezers are major factors for many cafeterias, convenience stores, and restaurants. They also use large amounts of energy, but until issues occur this is rarely considered.
Problems with walk-in freezers or coolers such as failure to maintain pressure or compressor failure may result in expensive internal repairs. Although, the high energy use and problems like this can be avoided when conducting requite equipment maintenance.
How an Evaporator Works
The cooling coils freeze the moisture in the air, forming a barrier from the heat transfer. Then, air flow decreases because of ice buildup, while the evaporator has its own defrost cycle which melts ice build up on coils. This allows water to drain normally from the ice.
Water Won’t Drain Out Of Freezer
When melting ice, the water should be drained from the freezer. However, this is not always done and allows water to become trapped and when freezing again, can result in damages. Old freezers are at higher risk due to cracks allowing water to get trapped and freeze/expand. To avoid expensive damages, taking action is recommended when you notice stalactites or stalagmites of ice building up in the freezer.
Ice On The Evaporator
“It isn’t unusual to find the evaporator in a poor state. For an evaporator unit, whenever water isn’t drained right or the ice has not melted it could cause ice on the evaporator. Whenever the coil freezes, heat transfer is reduced which makes the compressor work longer and harder. It works harder due to suction pressure drops which makes the compressor work at a higher pressure, which requires more power. It will work longer because the heat transfer is reduced. Whenever there is excessive ice buildup, the compressor will run constantly and the freezer temperature won’t be maintained.” 
How Condensers Work
The system’s condenser coil removes heat out of the refrigeration system. Finding condensers within tight enclosed spaces without much air flow is common. This prevents heat from being removed, resulting in increased temperatures from the compressors high head pressure, increasing power usages.
Check Condenser Coils Regularly
To ensure condenser coils are clean, they need checked regularly. Dust and debris have the same impact as ice buildup. These things insulate heat transfer while reducing air flow, making the compressor work harder, longer, and could even cause failure.
Condenser Should Be Well Ventilated
Condensers need to have adequate ventilation to remove heat, this helps control temperatures. This means exhaust openings for enclosed spaces, along with cooling air intake. In many situations, a fan will be needed for moving enough air in to the area. Heat that is not required for the condenser should be removed.
Although, there are situations when the heat can be used in other areas, such as a dry storage room. The controls may be installed so that it directly flows within the room for heating and when not needed, transfer it outside.
Inspecting Refrigerated Shell & Space
Even if the space lacks mechanical parts or equipment, there is still reason to check it. The cooler or freezer shell should be inspected regularly for any leaks, loose panels, or installation issues. Leaks, among other problems within the shell can result in more moisture than needed, becoming a larger problem.
The main part of a cooler is the door. Doors must be properly sealed to remove air infiltration, increasing cooling loads while creating moisture buildup within the space and on evaporators. It is normal for frost buildup to collect on the door. When door heaters begin failing, it will either prevent it from freezing, or closing shut. When putting items within the freezer, proper care needs to be used. When a freezer becomes overcrowded or items are placed in front of evaporator fans, air circulation is reduced, lowering overall refrigeration system performance.
“The compressor is a vital part of the refrigeration cycle. If the compressor isn’t running, it could stem from an electrical overload, a defective coil, or a malfunction within the compressor itself. A repair technician will check the compressor, scan the electrical systems to make sure it’s functioning and then either repair the faulty component or replace the compressor.” 
Avoid Energy Repairs & Waste with Walk-in Freezer & Cooler Maintenance
To avoid expensive repairs, excessive use of energy, and potential product failure, any operation issues with Walk-in Freezer/Cooler maintenance needs to be addressed.
“Walk-in Freezer & Cooler Troubleshooting Guide.” A/C & Refrigeration Co, 11 Aug. 2017, acandrefrigeration.com/walk-cooler-freezer-troubleshooting-guide/.
“Common Problems and Repairs for Walk-In Coolers.” Astro Air Inc. Blog, 24 Feb. 2014, www.astroairinc.com/blog/refrigeration/common-problems-and-repairs-for-walk-in-coolers/.