Have a vokera linea 28. When the gas fire was removed for the backspace to be cleared the lady of the house opened the hot tap. This caused the boiler to lockout and it was then rendered useless. After a circuit board change it was fine. We have just had the old cast iron gas main replaced outside and the boiler locked out upon switch on after a purge etc. Boiler useless again. Why does it need a new board after a lockout on the flame failure? Are Vokera total ****?