TEST OR INSPECTION
BURNER WILL NOT EXTINGUISH WHEN THERMOSTAT SELECTOR SWITCH
IS SET TO OFF (OPEN MAG VALVE LIGHT IS OFF).
Check that magnetic valve is not stuck open.
Tag and disconnect fuel supply line (1) from burner (2). Place
fuel supply line in any available metal container.
Disconnect burner spark plug lead (3) from spark plug (4) and
position as far away from container as possible.
Connect all fuel supplies and water inlet and outlet hoses to
unit. Refer to TM 3-4230-218-12&P for starting procedures.
Start the unit and verify that fuel does not flow from supply
line into container.
Immediately shut unit down.
If fuel flows, replace valve (refer to page 2-52).
If magnetic valve is not stuck, proceed to step 2.
Check for leaking or stuck check valve.
Operate unit, turn FUEL VALVE counterclockwise 1/4-1/2 turn.
Shut unit down, let heater fuel can remain installed and FUEL
VALVE turned 1/4-1/2 turn.
Disconnect return line from rear of burner.
Place open end of return fuel line in suitable container.