Our gas insert less than 2 years old will not light up. I have had 4 service calls, paid for 2 of those service calls and still having the same problem. First service, he cleaned it and said it was fine. Worked for a couple days, second, third and fourth calls they changed batteries. Fireplace works for a day if that and reverts to same problem.
If it has a pilot light, (website says it does) I suspect its the thermocouple. These are easy to change yourself and cheap, you can buy a universal thermocouple and it will be cheaper than a Napolean one. The end of the thermocouple is a fat copper pin that sits poking into a small pilot flame. The heat of the flame on the copper tells the system that the gas is burning ok so it allows more gas through. But after a few years the copper end gets covered in black charring and this slightly insulates it from the heat, so it signals to turn off the gas.
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