Not heating but element OK

Hi Can anyone help with this machine. It is not heating. I have gone as far as I can without a manual or circuit diagram.

The heating element is not open circuit, as far as I can tell the PCB is OK, a voltage is coming out of the board, I notice there is a microswitch in series with the heating element which looks likes it is operated by water pressure, this is OK so I guess there must be a thermostat or cut-out in series also.

I have not yet tried to disassemble and remove the element assembly as it looks a pig to get out (never having done it before).

Can anyone suggest what the fault is likely to be, or where I can get a service manual with circuit diagram? (or help with the next step of getting it out)

Any help would be much appreciated