Same problem with mine. There was a burnt connection on the heating block.
To fix this:
2) Unscrew top, 5 screws total. 2 on the back near the top, 1 under the water reservoir lid, and 2 up inside long black tubes located on the front two corners of the overhanging section.
3) Remove top, you'll see a large chunk of metal with a lot of wires connected to it. any one of these could be bad, but in all likely hood it's one of the 2 main power wires to the heating block. These are located on the back of the heating block. 2 metal posts with a flat piece if metal welded to each and a spade terminal on over that with either a red or blue wire. (colors may very, but i imagine it's universal)
For me it was the left of these two connections that was bad, the flat piece of metal was burnt and the connection was broken. To fix this I found a small metal clamp and clamped the spade terminal to the flat piece of metal. Soldering probably won't work, because the heating block could get hot enough to melt the solder, so this was the only suitable option. Short of actually removing the heating block and welding a new piece of metal onto the post.
4) Fix broken connection, if there's no obvious broken connection, or discoloration of wires, then it could be a bad heating block. Changing the heating block would be difficult to do safely for the unexperienced, so attempting this isn't suggested.
5) Return top and screws.
6) Make a delicious latte to celebrate
on Aug 18, 2018