its ok ive sussed it!
after contacting barcrest they told me it could be a problem with anything from wiing etc.
after spending a few days checking out the wiring on the lights etc i found out that the previous owner had put in a new 5mm bulb holder and wired it backwards (cus of the resistor) and that was causing the error when entering test mode or turning the refill key!
just something for you all if something like this hapens again!