I have a Triton T80 electric shower that is running at a very low rate of flow. I think the inlet filter needs cleaning but don't know how to get to it.

Have triton jade electric shower which cuts out after 5 minutes then will restart after 2 minutes then cut out again,the power light is constant but the low pressure light is on when the shower cuts out.have cleaned the head and pipe,the shower is 5 years old and had no other problems