I have a Ravenheat RSF 84 E which I've had for about 6 years. Apart from a handful of new thermistors on the CH and DHW side and 1nr timeclock it has worked well. It has now decided to pack in on me......If I either run a hot water tap or call for heating, there is a small click as the water moves through the system then the pump runs & the fan runs. But there is no attempt to spark up the pilot flame. It doesnt even make an attempt to 'click'. I have changed the DHW & CH thermistors and have checked for continuity from the time clock. Is it likely to be the air pressure switch? Or the ignition control box? I read in another post that they originally had metal honeywell ones which are now changed to white HUBA ones. The fault finding chart is suggestting that the ignition electrode needs checking/is faulty. I put a meter through it and it made a circuit but thats about all I know to test it. The guy I normally use for gas/boiler work is away at the moment. Although I'm sensible enough not to tamper with anything that would involve the gas side of this machine. Please help...we need to bath the kids tonite. !