The trouble with some of these codes is if it's a cascade fault, I've had things display a fault code and there's been another code behind it.Then you have to go into another menu to find the original fault.
Cars are terrible for this one too, people buy a cheap code reader and it only reads part of the codes,on a cascade fault it doesn't give the full list, and if you are new to it you can spend ages chasing your tail.
For example you may get the following on a display,
error 1, you look up error 1 and it shows that a controller has gone into lock out, however if you dig beyond this you then find error 14, you look up error 14 and find out that it's a limit switch that has tripped for whatever reason.
Error 14, won't allow the the controller to start, that throws up an error 1, telling you that it won't start, which you already know, obviously, but you have to dig a bit deeper to get the error 14!
I had a grain elevator, last year with a fault on it, this was indicated by a flashing light, it pulsed to give you a number, and the number indicated the fault.we'd worked out what the number indicated, but that wasn't the problem, rang the manufacturer to try and get some advice and they said the fault was what was shown on the display, clearly it wasn't.
After about an hour poking about with a meter, I found a relay that was open circuit, that was controlled by a limit switch that was deep inside the machine, I reset that and the fault cleared. I rang the guy at the manufacturers to let him know what I'd found, just in case it might help somebody else, his response was amazing. "oh yes, I forgot about that, if motor 1 overruns it trips the safety switch and locks out, however very occasionally it causes that limit to trip also, very unusual though"
I wondered afterwards if he had genuinely forgotten about it, or did he not realise it would do that? Either way it was sorted, and we know for next time!
