Is this a digital t stat that is flashing. Not familiar with your set up but it sounds like if the set point or the furnace called for heat and turned the fan on but wasn't able to get any because your gas was turned off it may coded a no gas with three flashing lights. Usually the fan will come on prior to ignition. Not knowing your system well you should have a fuse or a reset switch after you take the cover off the furnace. It should be on the right side. After checking, go turn the tank on slowly. Now turn on the t stat, now set the t stat to call for heat. You should be fine.
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Richard
2011 Jay Feather Select 28U
2007 Silverado Crewcab LT 6.0L
Happily married and father of
two university students.
Cancer survivor
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