Blood Pump Stopped. Tach and Rate Alarms

Does the blood pump actually stop at a flow rate of 40? If it does, I think the blood pump brushes are worn out. I believe it was Fresenius tech support who told me that if the blood pump stops for no apparent reason, try running the pump at minimum speed. If the brushes are bad, the blood pump will likely stop.

does your motor have the removable tach assembly if not you need to get the whole motor and tach assembly

So i ended up changing the brushes, they were down to the copper wire. If you do attempt this (I'm not sure if all machines are like this but it made a big hassle trying to work it from the cap and it is impossible to remove), do not take the cap off like normal. Remove the motor from the module and work it from the back side instead of the side where the leads go in. You can't clean the commutator, but you can definitely change the brushes and clean that dust out. After the repair I got an E.03 error on the module, and this is a warrantied error and they are sending me a whole new blood pump module.

Mine did not have that tach, but I was unaware that there was a instruction for this. If you don't have a "removable" tach it is still possible to put new brushes on. If i had to do it again I would think id have better success speaking the one i fixed will never get used again. So did i really fix it? Not 100% but next time I'm pretty confident.