Code 89 & 21 on thermo king reefer

If it's low Coolant/Freon, that should be easy..
But kinda need to find the leak and fix it.

You just bought this and it doesn't even run right?

 

well I use to be a ref tech and code 21 is low Freon aka check cooling system. From the sounds of it your system has a Freon leak and is out of Freon that's why the temp is going up and it is showing ETV system because according to the computer your unit should be at certain temp by now and its not getting there so it throws that code also. Depending on where the leak is depends on how much it costs to fix. Also pray its not a compressor seal then tech has to take out the compressor and install another seal, add oil to compressor then leak check and vacuum and recharge. Labor on that plus seal is like 600 to 700 then add in the 400 for the Freon that is where he is coming up with that ballpark figure. He is also adding in time for diagnosing and leak checking and vacuuming the system.

 

unhook one of your electrical lines to engine thottle valve. (its right in front of you when you open the door) It will let you run on low speed until replaced. Only 4 bolts on the mount.

 

Where and how do I add freon into an SB-210? Keep getting alarm code 21 and engine is shutting off

 

How and where do i add freon on SB-210? Engine keep shutting of and alarm code 21 keeps coming on.

 

Help: I have an sb 3 max. Recently, I had a load of candy that need to run at 65 continuous. I left truck for the night and came back to find that the unit had shut down due to a heating cycle issue (code 24). Can anyone tell what the problem is and how to repair it. Thanks

 

Most likely cause is low or out of freon.Other possible causes are 3 way valve not shifting or bad pilot solenoid coil or valve. Do you have refrigeration gauges ?

 

Yes