We had the same problem not so long ago with our Triton unit. The brushes were burnt out.
If... AND ONLY "IF" you have experience dealing with electricity and electrical items then it's not a very big job. HOWEVER... if you are in anyway unsure then get a professional plumber or heating engineer/electrician to do it.
Electricity+Lack of Experience=OUCH or even BYE!
The service company for Triton in Ireland is "Earthridge" in Maynooth Co. Kildare... (01 6286845 or 01 6286711)
Quote the info from the label next to external hose outlet below the unit.
Best of luck...
D.
January 2009