I have gotten an A,24 error on the blood pump on a K with 5k hours. Second time this came up in two months. Could not duplicate and dn't want to spend the money on a blood pump unless I have to.

Any suggestions to help verify?

Try a blood pump speed calibration.

5K hours shouldn't have worn the brushes out on the motor, however, there is that confounded tach-o-meter.
If the calibration does not work and If you have an hour and an known working bloodpump module, swap the motors. Then run it in dialyze mode for a few minutes. Alarm code returns, then you have a board problem.

I checked the arterial pump cal and when I set the 100 RPMs, it was originally run 5 RPMs faster. The cal took and I am letting it run. I never could get it to mess up for me before, so it may be a long time before it fails again.

Failed again, bought new pump motor and installed. Tested fine. Put it back into service.

Send the bad motor to H&S Technical for rebuild. And did you remember to remove the O ring and bushings from the old motor and put them on the new motor? I have seen several of those bad motors around that still had the O ring on the nose and the bushings for the mounting screws still in them. Fresenius does not provide those when they send out a new motor, and it's really easy to overlook them.

I changed it out and compared the two pumps to change over any parts. I think I got it all unless something was not visually obvious. It ran fine and passed my tests. Anyway, I held on to the old one just in case that was nto the solution.

Check the connection from the pump to the board, I've found it to be a big issue with A 24 alarm.

Have you had an issue with this pump chettrick since you replaced the motor? I have one doing the exact same thing, and after checking connections, recalibrating the speed, its still doing giving the alarm.

Dr Machine
IT has been awhile but I have not problems since, that I remember.

Oh jeez, sorry man, I didn't realize this was an OLD thread, haha...someone must have bumped it. Yea, I just ordered the new motor for it, since the Tachometer is attached to the frickin' thing, and can't be removed. Thanks for the reply

Has anyone had a blood pump turn faster than usual? if it's seet for example at 300 but looks faster than 300 and you get no error? if so How do you calibrate the blood pump speed? it's for a K machine

It's pretty involved, but can be done. Best advice I can give is look at the K-Machine Troubleshooting manual, lots of little steps. Not hard, but very involved

quote:

Originally posted by newtech:
Has anyone had a blood pump turn faster than usual? if it's seet for example at 300 but looks faster than 300 and you get no error? if so How do you calibrate the blood pump speed? it's for a K machine

Are you sure that the blood pump segment is set correctly?

A.24 is an " optical tachometer out of range " alarm. The optical tachometer is encased in the black plastic cover on the back of the blood pump motor. I do not know of any way to just replace the tachometer assembly. Whenever I get A.24 alarms, I replace the blood pump motor assembly.