Pilot Light will not stay lit. Just refilled the tank and re-attached everything for the first time this season. Any advice

Try replacing the thermocouple , and clean pilot .

There is a sensor called a pressure switch that is attached to the area of the blower motor for the exhaust fan. It is bad or plugged.

99% of the time it is just dirt and dust in the pilot light. NOT a bad thermocouple! These units generate their own power through the pilot light and it has to burn perfectly. Turn off gas supply, remove the cover and the pilot light assembly, including disconnecting the tiny gas line from the gas valve. Blow compressed air in, around and through it to get dust out. Replace everything, use soap bubbles at gas fittings to leak test and light the pilot. I bet it stays lit.

there could be a small blockage in the pilot light gas nozzle which just need cleaning

it is normal,you need patience

sounds like your thermacouplar is going out and needs replaced. Sometimes these will act like they are working fine , but when the pilot stays on for awhile and later goes out it is a sure sign that it is bad

It sounds like a thermocouple has gone bad. this is a very common problem with gas powered things ie; water heaters, furnaces, hot tubs. The telltale sign is when you release the pilot light button it won't stay lit. This is a safety feature and is relatively inexpensive and easy to repair.

You must clean the pilot regularly to ensure it burns properly. Use a small can of air for cleaning computers and blow air through the pilot to remove dust and small particles that accumulate in the pilot barrel. Use several burst being that it is 2 years old and has not been blown out. THe manual references cleaning the pilot in the maintenance section.

The thermocouple or gas valve needs to be replaced. Start with the thermocouple.

Good Luck

there could be something stuck in the pilot assembly since you added a new tank to system. Check to make sure flame is hitting thermalcouple. Can you wait for a repair man to come and take pilot assembly out and clean. He will also replace thermalcouple. If you can't wait and you feel comfortable with taking pilot assembly out. Turn gas and electric off to unit then pull cover panel off. Pilot assembly is held in with two screws. Take tube off of gas valve and take off thermalcouple line off gas valve too. take out pilot assebly. Once you have it out take gas line off bottom of pilot assembly. There is a orfice in side make sure you can see through the orfice. You can also clean thermalcouple with a wire brush or sand papper. Reinstall pilot assembly make sure all fittings are tight. turn gas back on and light pilot. If everything looks good turn power on. Turn heat up run heater for a few minutes then turn heater down and let sit to see if it will stay on.