Make sure your propane is on. Run the stove burner to purge air out of the line. Turn off the heater and then turn it on might try a couple times. It will reset it self if it didn't get propane the first time. A good place to start. If the stove burner won't light it's probably the safety valve. Or just switch to the other tank. Don't know why but it has worked for me in the past. If a tank is low on propane and cold might not be putting out enough vapor gas.
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