When heating a tent, there are occasional issues that cause the heater not to work properly. Here are a few easy things to check:

Is power getting to the heater? You can confirm this by plugging something else into the same outlet and be sure it powers on.
Is the power switch in the “up” position?
Normally the thermostat switch should be in the “down” position, but you can eliminate the thermostat by switching it to “manual”. Note that the heater will run continuously.
Confirm that the gas valve on the propane tank is open.
Be sure that nothing is obstructing the airflow either at the intake vent on the end of the heater or on the heat side. If the duct goes around a corner or is not smooth and straight, it can restrict airflow. If that is the case, the overheat reset button may pop.
Open the end panel on each end of the heater with a flat screwdriver. Inside each end, is a small red reset button. Press it firmly.
Turn the heater off and on again.

If it still does not heat, call us at 717.733.9700. We have someone on call at all times and we will return your call promptly if you leave an emergency message.