Hi i am, an hvac tech looking at a true gdm72f freezer cabinet when compressor comes on the voltage drops from 209 to 181 this is a brand new compressor in this unit

if seals are in good condition
no sizable water leaks from cabinet

one should suspect the thermostat is no shutting off compressor
test or replace thermostat

I made video how to replace compressor on true air beer cooler, should be the same for most of prep tables and etc. Hope That helps someone. REPLACING COMPRESSOR TRUE AIR BEER COOLER R134A

Contact the manufacture, it is most likely going to be covered under warranty. If the knob is not removable, (check for a set screw on the side of the knob it will take a small allen wrench) Then the thermostat (temp controller) will need to be replaced, if it isn't a style that you can calibrate.

Things to check are:

Is the thermostat set to the correct temperature (Low, Med, High)?
Are the door seals in good repair and making a good seal with the freezer cabinet frame?
Is the door warped or distorted in any way, will lead to leaks.
Can you hear the compressor/motor running?

It's extremely rare that the compressor will be any good. Usually replacing the start relay does nothing on these small units. If you know how to use a multi-meter and are any good at wiring the cheapest way to go is to get what is called a 3-in-1 start kit at a HVAC wholesaler. You need to know the model of the compressor and/or the horsepower to get the right one. I would recommend getting a service tech to look it over though. Most likely the compressor is locked up.

If it's mounted inside a box along with the capacitors there is 1 screw holding it from the back. Often you have to unmount the box from the compressor to access the screw.

Okay first True uses capillary tube not an expansion valve.
You say the compressor vibrates not cooling ?
If the valves of the compressor are bad, he may mean
internal valves but usually pressures would not be good.
Give a little more detail please.

ok hi there i viewed the specs for this freezer
http://www.truemfg.com/catalog/servlet/com.apsiva.servlet.HomeServlet
this unit must be plugged into a 120v outlet with a 15amp circuit breaker dedicated (nothing else should on this circuit) so all by itself. you have to check the voltage outlet where you plug in. you must have at least 115v or better (125v the most) if you have less then 115v it will cause damage. ok you went and checked all this out and everything is 15amp with 115v or better and it still trips breaker.
ok the running amps is 6.8 amps so to blow the circuit you need 15 amp which is too high.
i suggest you call a refrigeration guy because he will be able to determine if the problem is the compressor (which has a 4 year warranty with truemfg.com only in the USA) or something else. Usually but not 100% what would make a freezer like yours to blow the fuse is the compressor. if it overheats it will do this, if there is a sudden high pressure within the system it will do it, if you have a condenser fan that is not running at proper speed it will do this...
the problem cannot be pin pointed understand please... you have to babysit it, watch for changes in the refrigeration system and the running compressor amps, voltage drops ( this will cause high amps) etc...
Refrigeration is not easy and alot of tech stay away... so those who stick it out make money cause you have 2 choices: buy another one and pay big bucks to get it fixed. at least see if you can find someone to come over (for like $40 - $60) and tell you exactly whats wrong with it... whew... hope this was helpful and not confusing...sorry

Does this happen as soon as you switch it on.
There is a thermal overload inside compressor and usually an electrical current overload on compressor. if cabinet been off for a few hours and this happens shortly after switch on there is more than likely a blockage in the pipework or the compressor is burnt out

try replacing the relay/ overload you can buy a supco replacement there's 2 of them one covers 1/15 - 1/6 and the other covers1/3 - 1/4 its really easy to wire up and cost effective. any questions don't hesitate to contact by e-mail [email protected]