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Post by mthomas55 on Nov 9, 2022 16:18:34 GMT
I swapped out a balance chamber on a 2008K2 because 4 of the valves were failing leak tests. After swapping, the same valves are failing, 31, 33, 35 & 37. I swapped out power logic, actuator & functional boards & it's still happening. The UF pump calibration is spot on. Deaer, flow & loading pressures good. Originally the machine was having high tmp issues & failing pressure tests (Neg stabilize, pos stabilize, neg flow on). Also changed V24, V25, diasafe filter holder, air separator, CFS #9 & hansen connectors. I tested it after changing the balance chamber & it failed neg stabilize again. So the only issues now are failing neg stabilize and the 4 valves failing leak tests.
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Post by gnurk on Nov 9, 2022 16:32:34 GMT
how many hours you could have a leaking tubing connector if the hours are high replace them all there are 3 ts and 17 ys in the machine
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Post by mthomas55 on Nov 9, 2022 16:36:22 GMT
These machines are high hours, 46760 hours on this one.
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Post by gfreely on Nov 9, 2022 17:57:59 GMT
Have you looked on/around the Distribution Board? Almost sounds like you might have something affecting your BC valve wiring, like between those valve connections and the Actuator Board. Just a thought.
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Post by dave74 on Nov 9, 2022 17:59:40 GMT
It seems almost impossible that the same four valves would be bad on two different balance chambers. I am trying to think of what all four of those valves have in common. They all require negative pressure to go through the test. I think there is an air leak. The troubleshooting guide has an extensive section on this.
I've never had good luck with the valve leak tests.
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Post by CAguest on Nov 9, 2022 19:43:38 GMT
Looks like you've done alot but I'd recommend you take a step back and re-look at the machine with fresh eyes then start with the basics again.
I'd ignore the failing valve leak tests for now. Your initial problem was that the machine was failing the neg pressure tests so focus on that. There is definitely a leak somewhere either in the hydraulics or external components.
Does the machine pass with the shunt door open? Yes?- proceed to check external components (hansons,tubings,clamp connections, dialysate filter etc..) if a NO- check the hydraulics.
Swap in a good UF pump, calibrate it and put the machine into test to see if machine fails neg press. UF pumps can have micro leaks that are not detectable even if you see all the signs that it is a good UF pump.
May I ask, why did you replaced the whole balance chamber instead of checking the valves first? Did you check the valves via pos pressure test & not relying solely on the valve leak test? Did you install new valves on the balance chamber or did it come whole with valves on already? Did you take old valves from orig balance chamber and put them on the new balance chamber? Did you double-triple check that all the valve connections are in the correct location in the dist board?
I see that you swapped the air separator, check the tubing connections for micro leaks as well. I'd recommend you cut hose and re-insert, or replace the tubing with new if not enough to re-insert after cutting.
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Post by gnurk on Nov 10, 2022 13:02:59 GMT
do an induced positive pressure test, let run 5minutes check for leaks, do a neg pressure test tmp at 400 look for air bubbles
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