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Combustion in the Propex Heatsource heaters is initiated by an internal ignitor. When the heater’s logic circuit senses that propane is at the gas jet and ready to ignite, the onboard electronics activate the ignitor. This electricity jumps a small gap between the ignitor electrode and ground, creating a spark and lighting the gas in the combustion chamber.When the unit fails to light due to a fault in the ignitor, the heater will usually displ …

When the heater unit encounters conditions outside the parameters for safe operation, the logic circuits on the main circuit board may throw a fault code. This self-diagnostic feature helps protect the user and the heater unit itself and also points the user in the right direction for diagnosing the issue. The procedure for resetting a fault code is simple with the Propex heater but requires attention to the timing of the reset operation. …

The Propex heaters were designed to be safe and reliable sources of heat for your vehicle. Being mounted in a non-stationary vehicle presents it's own challenges as the units are subject to vibration and exposure to all types of environments. Because of this, Propex designers err on the side of caution and create distinct operating parameters for the heating units. If the heater's electronic protection system senses that the unit is outside …

The Propex line of heaters has an onboard fuse to protect its sensitive central circuitry. Consider this fuse your heater's front line of defense against an over-current condition for your heater. To protect this fuse, it is imperative that there be no power to the unit when connecting your Propex thermostat to or disconnecting from your heater unit. In other words, connect the thermostat and THEN the 12-volt power. If this sequence is not f …