When Your Rexroth Drive Is 86ed

Rexroth error codes are arbitrary — that is, there’s nothing about F401 that has to mean that you’ve got an MST error. That’s just what it happens to mean.

Except maybe when your drive is 86ed. F386 means “No ready signal from supply module.” So does E386. So does E886. And in every case, your machine is telling you that it’s 86ed.

What does 86ed mean?

Saying that something is 86ed could mean that they have been fired or even that they are dead. It can also be used to describe an item that is not on the menu any more or something that has been canceled.

We tried to find out where this particular piece of slang came from, and we found out that it is not clear, or at least that there are lots of possibilities. One of the more plausible stories is that it was a sort of rhyming slang for the 1930s slang term “nix” for “no.”

And sure enough, when your error message ends in 86, your drive (or maybe just your power supply) is 86ed. It’s dead.

The good news

Fortunately, that doesn’t always mean that your Rexroth drive has to be replaced. This error message is generated when a supply module is unable to communicate with the system and thus cannot provide the required power. In other words, the supply module is not functioning properly and the system cannot receive the necessary power from it.

This could mean that your supply module is defective, but it could also mean that it is not properly connected to the drive. Check your cable. If someone tripped over it and it’s not firmly connected to the mains or to the drive, then your solution is obvious — plug it back in.

This error message could even be telling you that the drive doesn’t have (or require) a separate power module but it’s looking for one. Just turn off the input monitor.

Or hey, maybe your power is out. Check that, too, if the other things on his list didn’t do the trick.


To resolve the F386 error message, it is important to take a systematic approach to troubleshooting. First, it is necessary to check the wiring between the supply module and the system. Check for any loose connections or damaged wires. If the wiring appears to be in good condition, then it may be necessary to test the supply module. This can be done by using a multimeter to check the voltage output of the module. If the voltage output is not within the expected range, then the supply module may need to be replaced.

In some cases, the F386 error message may be caused by a malfunctioning system, rather than a problem with the supply module. If the supply module appears to be functioning properly, it may be necessary to check the system components to determine the root cause of the issue. This may involve testing individual modules within the system to see if they are functioning properly.

If these steps don’t solve the problem, or if you determine that you need repair or reman for one of your components, call us immediately. We can provide repair or reman for your Rexroth industrial motion control systems fast to reduce downtime and stress.

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