If you re sure there is gas the pilot aperture may be blocked.
Wall mounted gas heater troubleshooting.
A manual fan on switch could be set at the thermostat or at the limit switch in the air handler furnace itself or wires could be shorted together in the thermostat wiring or there could be a bad fan controller itself.
If so turn off fireplace and let cool.
On 2017 10 10 by mod wall mounted gas heater fan runs even though the thermostat is off.
If you re wondering why your heater is blowing out cool air the first thing you should do is check your thermostat and make sure it s set to the correct temperature.
All slotted burner flame holes should be open with yellow flame present.
Some burner flame holes may become blocked by debris or rust with no flame present.
Pilot light will stay lit.
Try kicking it up a notch to see if there s a noticeable difference.
Heater is blowing cold air.
If there is or your heater runs on natural gas check the handle on the gas line.
Off grid wall mounted empire direct vent heater.
But when you turn the pilot to on the unit burner and pilot go out after about two minutes.
You may have a bad thermocouple.
During the course of servicing your heater you may have to disassemble a gas fitting so it s a good idea to have a small wrench some pliers and a screwdriver handy and a bit of basic.