top of page

FRIDGE ASSIST    (All the following is based upon Refrigeration Industry Practices and Protocols)

Suggestions for simple problem resolution:  (Applies to most brands / types of DC compressor systems)

Compressor fails to start or cuts out prematurely:

By far the most common problem DC refrigerators experience is the 12VDC power supply, and not  the actual system, compressor or Motor Driver Module itself! (MDM or Black box!)


To explain:   All of these DC compressors have a Motor Driver Module, (MDM) which inverts the supplied DC power into 3 phase AC power to drive the 3 phase AC compressor motor. These MDM's are sensitive to and internally protected against the various power supply issues'. These internal  safeguards of the MDM include protection against high / low supply voltage, over heating, excess current draw, and compressor or fan overload,  

For example:

If the voltage drops away too much at a start attempt or when running, the MDM's low voltage cut out prevents the module driving the motor, starting or running.  (Resumes 'On mode' when voltage again rises to approximately 12.5v) 

This shut down because of a poor power supply, is usually due to either a defective, or faulty battery, battery to MDM wiring, or faulty devices along that circuit like bad *spade terminal connection, switch or overload.  (*Specially - & + on the MDM)  


If unit won't start or continue to run, below is the easiest and industry recognised way to identify if voltage drop is the problem or if the MDM is faulty..   Note: Simply connect multi-meter probes to terminals 8- and 8+ on Ozefridge system.

The suggestions above regards power supply issues are just a small part of the 'Fridge Assist' document. The entire document covers many of the issues Marine Refrigeration users may encounter and especially if cruising in remote areas.
We can email the complete document upon request via this link: (no obligation) or call.

Right: Louie's dedicated ZOOM room makes interaction more personal and instructive. 

z IMG_1685.JPG
test 53-35.png

Research and development is not left to 'guesswork at Ozefridge. All system types and components are well tested using Refrigeration industry processes and protocols.

< Left: Our test / research room is temperature controlled and equipped with devices that allows us to replicate all of the issues a system is likely to confront.  We can replicate high / low environment temp & humidity, voltage, compressor speed, cabinet loading, over / under gas charging, system contamination etc.  
Evaluation of the various system types can be accurately assessed and compared in identical sitruations.



This refurbished system build area improves output and provides a better product flow from raw materials to completed systems. 

Right: We maintain a large stock of spare parts to support our products. Parts can be dispatched daily world wide via AusPost express (Not Sunday)

22 20220111_094351.jpg
bottom of page