Reply8A means 'Chilled Water Flow (Entering Water)'. That means the entering water temp fell below the leaving water temp by more than 2 degrees which indicates loss of chilled water flow. It also could be a bad sensor or loose connection to the sensor.
Regular Guest
I have a Trane CGAEC605AEA1DERM chiller. The unit has sat dormant for several years and now we are starting to try and bring it back on line. It all looks function and my service tech has been able to start it but it only runs for around 2 minutes then shuts down and displays "8A" which it says is the inlet water sensor. Is this what this code actually means? Is there any way of verifying that this is the problem that is shutting the unit down?
Professional Member*
8A means 'Chilled Water Flow (Entering Water)'. That means the entering water temp fell below the leaving water temp by more than 2 degrees which indicates loss of chilled water flow. It also could be a bad sensor or loose connection to the sensor.
Regular Guest
Where would these be located? I checked the roof top unit and did not see the sensor. I would like to replace it but need to know where it is located.
Professional Member*
That's a very basic question. Are you a tech or end user?
Regular Guest
I am the end user, trying to get the info for my tech so he can bring the sensor with him when he comes in.
Professional Member*
That code doesn't mean you have a bad sensor. There are several things that can cause that alarm and a bad sensor is just one of them. Your tech should be able to diagnose the problem. You don't just want to start replacing parts.
Regular Guest
This is what he has narrowed it down to. All else seems to be OK
Professional Member*
I don't understand why you would need to know where those sensors are located at so you can get the info for your tech. If he checked out your chiller and came to the conclusion you have a bad sensor, he should be well aware of what sensors they are.
This is not a DIY site.
Regular Guest
look, I am not trying to fix this myself, all I am trying to do is save a bit of time so I can have the part here so he can put it in or so he can pick it up to put in, he is on other calls and is not available every minute of the day, he has other jobs to do. I have a machine down and is essentially going to shut down production so all I am asking for is a bit of help from professionals so I can speed the process up a bit, if that's all right.
Professional Member*
Here your asking if this is what the code means.Originally Posted by e2zmaint
Here im telling you that is not what the code means and give you some direction where to check.
Again, im telling you there are other things to check
You said in your opening post you wanted to verify that was what the problem was.
So which is it?
Regular Guest
thanks for the help.....
Professional Member*
I'm trying to help you not spend $xxx on a part you may not need.
Did you check if the machine has flow?
What do your entering and leaving water temp sensors read with flow and the machine off?
Regular Guest
the machine does have flow, the flow switch operates, I have physically watched it engage and disengage when we turn the machines' water pump on & off. We have a Johnson Controls A319 temp controller on our process water line, can't read the tag fully for the sensor it has, I don't know if this has anything to do with it.
I know this is difficult at the best of times, it is just that I was trying to help my tech out. The unit actually starts and runs for a couple minutes, but not long enough to read the freon pressures on either side of the compressor, and this "A8" error shows up. This machine probably has not run in 5 or 6 years so if I happen to replace a couple of parts that it may not need, at least they'll be new..
Professional Member*
What about the water temps with flow and unit off?
Regular Guest
running about ambient, outside about 69 and inside somewhere around 74
Professional Member*
What does Operating Display Menu 'E' and 'F' read with flow running through chiller and chiller off?
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