What is the make of the unit please
Yup thought so.
The transmission has gone out. It can be repaired, but it is a major tear down, and definatly not for a novice. I know experienced repair people that wont touch them. Once they go they are pretty well gone period.
As for a manual... Good luck. GE is one of the hardest to get a manual from.
I think you might wish to consider a new unit. But be sure to save the tub from this unit. They make the best burn barrels for summer nights at the camp site.
I am sure that this is not what you wanted to hear, but it is the only honest answer there is. I would appreciate it if you would honor the time I have put into researching, and answering your question by clicking on the accept button.
Best regards; The Home Smithy
Once you have clicked on the accept button, please be sure to leave positive feed back for me.