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Found that furnace was locked out on a code 7 ignition lock out due to re tries . Had 26.91 volts going to gas valve but not opening. Called johnstone for price and availability, they had valve so ran over and picked up gas valve and replaced. While replacing valve also noticed that wind was rushing down the vent pipes and told homeowner that during these high winds pressure switches can be affected until winds would come down and shut down furnace and would need to try an reset . Also tested for leaks and gas pressures on gas valve I had 8.2 w.c. Coming in and 3.6 w.c. Coming out , furnace back up in operation again.