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I thought I would have ago by myself on repairing. I had a continuity test on the thermal cut out switch using a multimeter and this working fine. Checked the inside filter no issues there. I noticed that the power LED is not bright when it refuses to work. I placed the front cover back on and this time the power LED was bright and turned the shower on and it worked fine. When I switched it of from the ceiling power code and then back on again the power led was not bright and it did not work.
Something intermittent but have got it working now and have tied the pull cord up so no one turns it off. Triton service was asking for £100 call out charge :-(
Any ideas guys could it be the solenoid?