Good luck with that.
probably your only option is to ask someone to restart it.
Another option for the future might be to plug it into an outlet which can be remotely controlled (such as home automation). Then you could cut its power anytime you wanted and force a restart.
Alternatively, if nobody can get there, just don't pay the electric bill. After power has been cut, you can pay the bill and the machine will restart.
Unfortunately, the safeguards and alternative options have to be present before the problem occurs. Without those already being there, you need to involve the help of somebody near the machine.