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hi. remove the drum unit from the machine and verify the contact in the back side of the unit . maybe is dirty . if problem persist you need to try another drum . if problem peristaltic after that maybe there is damage in the hvt electronic board
...This thing is a medical IV feeder. Nothing to do with pool or spa, if you have this in a pool or spa you should talk to whoever put it in. But as it says on the screen its not reading anything feeding thru its lines. Probably a peristaltic pump and something is clogged into the lines before it or in the tube that pumps itself.
You could have a timing belt that has slipped. This would mean the pistons are hitting the valves. This is not an easy job. You have to drain the coolant, take off the exhaust and intake manifold, take off the head to the cylinders on the engine block. Check for damage to the pistons, replace everything and change the oil.
Depending on what you need, you may be able to substitute from another source. Bearings and seals and bushings are readily available from many sources if you have the diameters and widths and seal requirements. Good luck.