OK, all you tech heads out there, here's another one for you - my hot water heater has been kind of hit and miss last few nights. I can usually hear it when the gas ignites but tonight it isn't catching alight, it's trying to ignite - it tries 3 times and then gives up and the 'On' light just stays on rather than turning off as it does once the gas ignites. Just put a new gas bottle on and it's flowing. Ideas?