hitachi sf95gj error code c3?

Your machine has detected a leak. All you can do in the short term is to open up the filter trap on the bottom front of the machine and let the water drain from the drum. Be prepared to catch and soak up all the water that will pour out of the trap when you open it up!
When you've drained the water like this, give it a day or so for the leak sensor to dry out and you should find it will operate normally for a while. Long term you will be looking at the very least to be cleaning the leak sensor and possibly a replacement pump.

Rupert
May 2020