First the furnance and now the water heater. Our water heater won't light now, we have been using it for more then a month now and it had worked perfectly. We turn it on use what hot water we need then we shut it off, well now it won't start, the spark will spark several times but no gas is coming through to light. Don't know if there is a thermocoupler on these or not. Hot water heater will still work on electricity and yes we have plenty of propane. Any ideas?