My chiller factory settings has the water at 30C. That is 86 F.
For gosh sakes I have never run it that hot.
Jack, Did you tell me you have yours set at 20C or was it 25C?
It was set to 25C (77F), but I lowered it to 20… I think mid 70s is too warm, but that’s my opinion.
One of the Reci articles I read said 15C to 40C, which I find hard to fathom…
This one on the K40 tube life claims something completely different…
Things seem to run better at lower temperatures… IMHO…
I’d suggest you go through the manual and check all of the temperature settings…
I have read through that dissertation, will read it again.
When I was running the pump in a bucket I tried to never exceed 65 F. I don’t like 70’s.
My first 5202 had an issue with the refrigeration unit, so I couldn’t use it for a chiller…
I did use the extra connection in the rear to run 3/8" copper tubing in a loop inside a beer cooler… Dump a 10lb bag of ice in it and get a few hours of use…
I was colder than I run the machine now it was in the single C digit range… about 40F…
I forgot to mention also: After changing the connections to H1 and H3 the laser fires. lol
Thank you so much. really appreciate your help and expertise
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I changed the setting to 20°C. My shop is normally around 80°F unless outside temperature rides 95°F to 100°F. Lowest reading I get on the chiller is 21.7°C Occasionally it will drop to 21.5°C.
My weak mind tells me that could be low level of freon/other refrigerant. Any enlightenment?
You need someone to check it … when mine failed I couldn’t find anyone I could take it to, they only did house calls…
I ran my new one at 20C when it was 40C outside and it worked fine… So it sounds like you are right…
We have had a few days with Fall like temps, low to mid 50’s and my shop temperature dropped about ten degrees. The Chiller dropped the water temperature to 20.2°C in less than five minutes.
While laser is powered up and engraving/cutting it won’t go below 21°C (70°F). I am going to see if I can find a service company for residential I can take it to. If nothing else tell me if it is actually low on Freon.
It indicates a defect, as you yourself suggest, I can get down to 16 degrees Celsius if I want.
Normally, it is relatively expensive to check and top up coolant because service valves are often missing and they have to be retrofitted for the task.
My CW 5000 is set to 18 degrees Celsius. I think anything around 20 degrees is ok, but I avoid temperatures that are too low to avoid condensation.
Bernd,
I sent a request to the company I bought it from yesterday. He replied with a generally different procedure for setting the temperature which I followed. The unit works as it should now.
Enclosed is the new instructions I received. Maybe help someone else.
- Press up and then hold set until 0 is displayed on the screen.
- Adjust it to 08, press SET, F0 appears.
- Adjust it to F3, press SET, 1 appears.
- Adjust it to 0, press RST.
- Press SET, and adjust the temperature to what you want.
…sounds a bit circumstantial, but if it just works, it’s fine 
Got to be smarter than the electronics… 
Was the steps different than in the manual?
I had mine apart and could see the temperature control module, so I just got the information from the manufacturer.
Great it’s functional… that’s a major relief.
Jack,
After resetting according to new info the temperature stays within “0” to ".3°C of my 20°C setting