Flame Fault

Notes:

  • For troubleshooting a flame fault, leave the burner switch on the Remote Operating Panel in the ON Position.
  • There are three methods to reset the burner after a flame fault has been detected:
    1. Turn the burner switch OFF, wait 1 second and turn it ON again.
    2. Press the reset button on the front panel of the heater (this method will be used in this troubleshooting section).
    3. On the touchscreen remote, press the “reset” button.

Check the following before continuing with the troubleshooting:

  • The fuel supply from the fuel storage tank to the fuel inlet of the heater must be from a dedicated fuel pickup on the top of the tank.
  • The fuel level in the fuel storage tank must be above the level of the bottom of the fuel pickup tube. In most cases, the fuel pickup tube in the fuel tank does not go all the way to the bottom. It is usually installed somewhere between the one quarter and half way mark on the fuel tank. This is done so the heater does not drain the fuel in the tank and leave the user stranded.
  • The total rise from the bottom of the fuel pickup tube to the fuel inlet on the heater should not exceed 60”.
  • The fuel return from the heater must go back to the diesel fuel storage tank.
  • The fuel line from the diesel fuel tank to the inlet of the heater must not have any kinks or leaks.
  • All fittings must be leak free.
  • The external fuel filter must be clear of any contaminants obstructing the flow of fuel.
  • The first time that the fuel line is connected to the heater, there will be air in the line. It may be necessary to reset the heater a couple of times to bleed the air from the fuel line. It is strongly recommended that the external fuel filter bowl be filled with fuel prior to attempting to start the heater for the first time.

If any of the above issues were found to be a problem, correct the situation and press the reset button on the front panel of the heater to allow the burner to fire again.

Keeping the power button ON, remove the screws on the front panel of the heater and fold down the front panel (do not disconnect the plug on the front panel). IMPORTANT: when folding down the front panel, place a rag underneath the wires to prevent them from getting cut on the edge of the bottom tray. Also, use spacers underneath the panel which will prevent the buttons from being pressed.

CAUTION: If the use of the bypass mode is required during troubleshooting, it’s strongly recommended to disconnect power to the air compressor prior to going into bypass mode. Do this by disconnecting the RED power wire to the air compressor from the main harness. The power and ground wires for the air compressor are paired together using RED heat shrink for easy identification.

  • With the power to the air compressor disconnected, no fuel will be delivered into the burner chamber, so it is safe to run the heater in bypass mode.
  • If the air compressor is connected, then the heater will attempt to deliver fuel into the chamber, even if ignition does not occur and the flame sensor indicates a flame fault. If this happens, press the power button right away to get out of bypass mode and power down the heater.
  • If it’s necessary to keep the air compressor connected while in bypass mode, make sure the coolant temperature is low. If the heater fires and continues to run, even though the operating limit has been reached, the safety limit sensor will shut the heater down. As good practice, it’s best not to run the heater in bypass mode while the coolant is hot.
  • If the remote switch is left in the ON position during troubleshooting, pressing the reset button to get out of bypass mode will put the heater back into a state where it will attempt to fire as long as the coolant has not reached maximum operating temperature. If you have finished with your test in bypass mode, pressing the power button instead of the rest button will power down the system and will prevent a further attempt at starting the heater.