my brother has a gloworm boiler which now for some reason wont fire up....when you turn the room stat up & turn the boiler on to fire up nothing happens.....the fan dosnt seem to kick in...the red and clear pipes to the microswitch look fine .....when you do turn it on the fan twitches a little like its just about to go then nothing!!! subsiquently the ignition does not start...can you help...thanks