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When you get the “click” but the unit does not ignite.Make sure water is flowing through nozzle end of wand.The unit will not light if the gun valve is in the closed position.  Unit will light faster if nozzle is removed before lighting, this speeds up removal of any air locks.
Empty propane tank.Check to verify that propane tank is not empty and that the propane tank valve is open.
Inadequate water flow to unit.Check water supply to ensure adequate flow to unit.  Your unit requires at least 20-30 lbs. of water line pressure, or the machine will not operate, a safety feature of your unit.
Blocked/obstructed nozzle.Check to make sure nozzle is totally clear of obstructions.
Excessive gas pressure.Check to see that your gas reading is NOT MORE than three or four pounds of pressure. Too much pressure will also prohibit lighting.
No spark at pilot burnerCheck for spark at pilot burner:
Is spark electrode hooked up? (This is the red nipple attached to the control module.)
Is the burner grounded on the coil?  If it is then re-position coil away from the burner.
Spark ceramic cracked or chipped.Replace the pilot assembly.
Cable damaged.Replace the pilot assembly.
Inadequate spark gap.Check gap to see if it is 0.1”.  The spark gas is part of the pilot assembly housing.
If there is still no spark, replace the control module.
Burner system is wet.Ensure that the burner system is dry.
If pilot is not lit:
Put a mirror under the body of the machine to view the burner area.
Check for a clogged pilot orifice.
Remove the thin coupler line and unscrew the pilot orifice from the pilot assembly.  Two very little holes should be clear upon inspection up to a good light source.  If not, then replace.
If there is a pilot:
Check to see if the flame sensor is red hot, if not, clean or replace the pilot orifice.
Check if the flame sensor wire is not damaged and hooked up properly.  Replace or go on to “c”.
Check for cracked flame sensor.  Removing the flame sensor will give you an accurate view of any chips or cracks to the flame sensor.  If you find these, then replace the sensor.  Tighten just slightly past hand tight.
Inadequate supply of gas.Check for supply of gas, if there isn’t any then get propane tank filled or check for obstructions in gas lines or regulator.  Fuel pressure gauge should never be run higher than 6 lbs. of fuel pressure, the burner can become flooded and not allow ignition.
Pilot solenoid not openingCheck to see if pilot solenoid is opening by connecting the wires to an alternate 24-volt source. (For example, lines three through six on the terminal strip. Touch one wire to this source and the other wire to a ground.) You should hear the “click” or the pilot solenoid opening. If you don’t, then replace the solenoid.
When you do not get the “click”Process to check ignition system by a tester or meterTurn the pump and ignition switch to the “ON” position with the unit plugged in.  The gas tank should NOT be hooked up to the machine at this time.
Make sure the wand control is open and water is flowing through the machine.
Check for 24 volts at the transformer.  (Left side of the transformer as you face it.)  If there is no voltage reading, change the transformer.
To check for 24 volts on the terminal strip:
Touch one wire of the volt meter to the wire on the terminal strip at position four and the other wire on a ground or neutral wire.  If you get a reading, then go on to line five and continue until the power is interrupted.   Every switch has 2 wires, one accepting the power, and the other feeding back from the switch after it has been energized.  Once the faulty switch is determined, then replace.
Temperature rises too quicklyThe air has not been purged from the system.Shut down and allow air to escape.  To speed up this process, take the nozzle off and turn the pump “ON” and “OFF” a few times.  Once there is a steady stream of water and there is no sputtering, then the pump should run smoothly also.  Replace nozzle, turn on pump and machine should be ready to light.  IF YOU LIGHT THE MACHINE AND HEAT AN AIR POCKET, YOU COULD BLOW A COIL.  CAUTION IS ADVISED.
Fuses keep blowingCircuit overload.If your circuit trips, then move to a different outlet. You may be overloading that circuit.
Repeated blowing of fuses.If the fuse on the machine is blowing again and again, you most likely have a problem with either your pump or motor, or you may be using too long of an extension cord. Try not to exceed 50 ft. of heavy-duty extension cord. Or you may be using the wrong size fuse. Check the machine specification table for correct fuse size.
Pilot burner doesn’t shut offThe pilot solenoid may have debris in the valve not allowing it to close all the way.Remove any debris that may be lodged in the brass section of the valve
Excess carbon forms on coilsArea at top of burner not clear.Check position of coils to insure clear area around top of burner.
Mushroom section on the top of the burner may be looseReplace burner if this piece can be moved by hand.  
Debris in burner opening.Inspect burner for debris in opening.  If nothing is found, replace burner.
Gas flame goes out or is irregular
Note: various safety features will turn gas off automatically.
Inadequate or fluctuating water pressure supplyCheck and ensure that water pressure and flow are adequate for proper machine operation.
Internal gas pressure is too high. 
Weak pilot or a cracked flame sensor rodWAIT 30 seconds for automatic re-ignition.  If re-ignition does not occur, or if machine shuts repeatedly, check the following:
Reduce LP gas pressure to reduce temperature by turning knob on the gas regulator counter-clockwise.
Check nozzle for restrictions and clean.
Check water supply for adequate flow, check for leaks at fitting and incoming water pressure.
Remove pilot orifice and clean dirt out.
Inspect and/or replace flame sensor rod, if cracked.
Make sure the propane tank was not overfilled.
Unit does not burn hot enoughImproper temperature settingCheck for max. setting on the temperature gauge. The knob may be adjusted downward. Keep red line at 340˚.
Gas regulator adjustmentAdjust LP gas regulator upward to a higher temperature by turning knob clockwise.
Tank freezing.Check fuel supply. The fuel pressure may be dropping due to the tank freezing. Change to a second tank.
Mushroom section on the top of the burner may be looseReplace burner if this piece can be moved by hand.  
Partially blocked burner.Check flame color around mushroom. Inspect the flame with a mirror under the machine to view burner area. If only a partial flame is visible, then replace the burner.