Glow worm 100e won't fire up now, fan? Are you about Hi-Tech Plumbing?

Hello Hi-Tech Plumbing, or anybody who has a suggestion please.
I have just replaced the diaphrams on my GW 100e compact. I have also just changed the Low pressure switch, pressurised the system, bled the rads, switched on the power etc. all lights up (green). get demand lights for H/W or C/H, pump running, but, can't hear fan going. I assume this is why it won't fire up. (The low pressure warning light is now extinguished by the way-hi-tech plumbing). When I took out the LWP switch, although the guage read zero pressure, and I forgot to let off at the drain point, there was pressure.(twit). I was dressed to go get the new switch as I removed the old... and needless to say, I got plastered with water, which also blew across the pcb cover. I have since had the cover off, and it seemed that the board was dry, although there was a little water behind it.
I have pulled off all the electric plug-ins and put them all back(they were dry). I did notice a little browning on the bottom right hand side covering 3 little resistors, but these are the opposite side to where the fan powers from, so, I feel it is maybe ok?
I also noticed that the hot water demand switch glows faintly even when there is no demand, do you think these faults are connected with the pcb browning? I don't really want to fork out for a new pcb if I can avoid it.
Thank you for any responses in advance.
Chris Wiles
ps. the wifey's gonna shower in the motorhome 2nite, and I expect she'll sleep in too, to avoid my language!!