Hi, i fitted a keston c36 in my parents place just before christmas, had trouble with the diverter valve and keston replaced the resistor on the loom and all seemed good, now there is a fault code come up saying lack of ignition, whats the most probable cause of this? Checked the condense trap was free and cleaned the ignitor and it fired up, so i left but have just had a message and its still playing up, what else could i try? Cheers