E:02 error code what does it mean?

SOURCE: HHH Error Code

Generally, an HHH error code means the machine is sitll too hot from making the previous loaf. Keep the door open for a bit and allow it to cool down.

SOURCE: Hitachi HB-C103 Bread Machine Manual

The best thing to do is to read any manuals you can find. The machines made by Hitachi will all basically work the same. The important thing to know is what size loaf your machine makes. Just look at other machines at the place you can buy them to get an idea of loaf size. Then find a recipe for the size you have in another manual. Run your basic cycle and note the times that different things happen.
You can deduce what is happening based on the information you glean from all the different manuals you read.

SOURCE: NEED MANUAL FOR HITACHI BREAD MACHINE HB-B201

HI Irvin, breadmachineshelp.com has a copy of the HB-B201