I have a gas furnace and sometimes it will not kick on. It's a thermal zone gas furnace. Sometimes it works with no problem. Other times it will kick on with flames then turn right off. Thanks

Probably a bad thermostat try elevating the temperature to the max and look for flames. It could also be a clogged regulator.

I changed it a couple of weeks ago. It will turn on and do its cycle flames and all for 10 -15 secs but then kicks off if turn it on man. A couple of times it will kick on. At night it just stop maybe because its cooler out now.

How old is the furnace? Natural gas or propane? Your best bet is to contact the manufaturer of the furnace.

97 and it is gas

I just broke this too cleaning it out. Can anyone tell me what it is and how much it will cost thanks