hi, can anybody help me as i have problem with my ferroli optima 701. i have been away and turned the boiler off but i cannot restart it. i wait for the fan to start and depress the knob but cannot hear it sparking the boiler is calling for heat, air switch, pump and pcb seem to be okay. In the past it started first time everytime, if you have any suggestions on how i can find out what the problem is would be appreciated. I want to use this boiler until the summer and then change it as i will be having a new extension built.