usually, when an Ignitor fails, it burns up internally, ..like a lite-bulb burning out,
and becomes an "open circuit".. not a dead short like a motor will.
If the motor has fried one or two layers in it's windings..
it will draw more current than usual, then it may run at a "slower than normal speed"...
If the diesel-fuel pump turns at less than 3200rpms.. it might NOT allow the pump to make full pressure..
..which will NOT allow the burner to burn clean, ..building up soot.
sound familliar ??
Y'all need to learn to carry a test-meter and learn to check for "resistance" more often than voltage..
it is more accurate, and safer.
From now on, I am going to offer a Presssure Washer Troubleshooting Class
every time I put on a Wash Water Control certification class..
You guys need to troublshoot faster than "guesswork"
..at 3AM,
..in front of your most valuable customer,
..or during a demo,
..on a difficult day.
I make a big deal about how you guys should "know" the local service center,
but you are "on your own" ..more than an hour away from the tech,
..or even after 5PM
Troubleshooting that burner should have been a 15 minute project.
..and once you DO get it up,
you'll have a bunch of unburned fuel to clear out of the burner chamber..
If you are not prepared for that, you could have an "uncontrolled fire" on your hands.
..You might have to pull the reed-switch out of the flow-switch real quick,
(or pull the microswitch out of the pressure switch for you econo-machine fans,)
and hold the trigger-gun open to let the fire burn itself out.
..whilst the flowing water keeps it from overheating.
When you do start the beast up.. do it without a spray nozzle in the wand..
let it flow easy, and with less noise,so you can "hear" the burner you are working on..
A blower wheel could cause all the same symptoms descrided above..
including killing the burner-motor prematurely.
that reminds me.. Russ's suggestion of checking the fan-wheel for binding was a good one.
There's more to clearing a flooded burner than I have time to write just now.
So just call me if you need me.