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This says you have a failed sensor S3. I have searched all available sources and can not find any S3 sensor on any wiring diagram. Suggest calling Delfield as I believe the control needs to be programmed to ignor this as there is probably not sensor on the the unit for S3. Sorry I can't be of further help.
You have to give more info. What refrigerant, where is the unit located so ambient temps can be considered, is there a cap tube or txv. http://www.delfield.com/docs/uploaded/del/manuals/DM6000XL.pdf
Try this web site from Delfield. It should be you manual. It says your unit has 404-A. Check it out and let me know if you need more info.
Take a hair dryer (or take off the gasket and throw them in the clothes
dryer (yes I am for real I do this all day long)) then put them back
on. or the hair dyer way is keep heating the gasket up and holding the
door closed while you do it. they should start to seal as you are
pressing them together.
Wow, what a challenge.
I found what I think you are looking for.
First, this only applies if the controller is an MCII. Should be printed on the face of the control.
In their 1996 manual for 6000 series reach-ins, it states that the number "4" error code is "Continuous operation with overtemp condition." It also says "What to do." and lists "Check refrigeration system and control system."
Hope this is what you are looking for. Good Luck.
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