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Re: burner will not fire
I do not know if you machine is single or three phase. But whatever, one simple thing is to check that you have the right rotation. If the rotation is good, then fuel can be pumped. Now there must be a sensor that switches on with water flow. No water....no fire. If there is water passing, then the sensor is stuck and showing that there is no flow. The thermostat also opens a solinoid valve in most machines of this type. If solinoid valve is faulty....fuel will not come out. If this is a diesel boiler...check gap of electrodes and condotion of fuel nozzel. One last thing, is something I found in a machine of a friend of mine. I found everything correct....but then I found that the fuel was totaly mixed with water. So, that you have correct fuel, is also important.
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I believe the HDS sends spark to the ignitor any time the machine is on ( hot or cold) You should hear the crackle of the ignitor in the burner area. Perhaps the ignitor rods are not properly aligned. Perhaps your ignitor coil is bad. There are several safety switches and the thermostat that would keep the burner from firing if they are bad. There is a pressure switch that turns on and off the motor for hot or cold operation. That is apparently working. I think there is a flow switch that turns off the burner. The thermostat might not be opening and closing contacts and that will keep the burner from working. I believe there is a high temperature safety switch as well.
first do you have a fuel solenoid???i am a burner tech for thirty plus years.fuel solenoids are mounted on the fuel pump.flow switch.high limit switch and thermostat are connected in series to feed the fuel solenoid.
you may have a stuck fuel solenoid valve normally located by the fuel pump i am a pro at this feel free to tell me the devices your unit may have pressure switch flow switch and thermostat normally are connected in series for burner to come on they all must connect.if u disconnected fuel solenoid connector and burner stays on while your squeezing the trigger you need to replace the solenoid valve it about 20.00
The fuel solenoid is controlled by two switches, the flow switch or pressure switch and the thermostat or snap switch. These switches are wired in series which makes them relatively easy to test.
First pull the electromagnet off the fuel solenoid valve on the fuel pump hooked to the side of the burner. Slide a screwdriver inside of the magnet and turn on the burner. It should magnetize. If it doesn't you need to pull the electromagnet from the wire it is hooked to and test for voltage. The voltage will be either 12V-24V, 110V or 220V depending on the solenoid you have. It will tell you what voltage it should be on the side of the solenoid. If you have voltage you need to replace the electromagnet. If you do not you will need to follow the wires back into the electrical box.
The next switch you will test is the snap switch or thermostat. It is wired in series to the solenoid wires. If you have a thermostat test for voltage on the outgoing side. If you have voltage the wiring to the solenoid is bad. If you don't have voltage, test for voltage on the incoming line to the thermostat. If you have voltage your thermostat is bad. If not you need to test the flow switch. The process is the same if you have a snap switch however instead of testing the terminals you will test each wire going into the switch for voltage.
Next you will test the flow switch. First test for voltage coming out of the reed switch on the flow switch. If you have voltage your wiring to the thermostat is bad. If you do not have voltage then test the incoming side of the flow switch. If you have voltage your reed switch and or flow switch are bad. If you don't you will need to test your main power switch as the problem lies in the system sending voltage to the burner circuit.
This is a complete test of the burner circuit and should help you isolate your problem. If it doesn't feel free to contact me at 800.247.8103 and I will help you trouble shoot further.
Sincerely, Aron Kerr Landa Northwest, Inc. www.landanw.com
The issue with the black smoke could be a number of different things, the fuel filter could be bad, the air to fuel ratio on the burner system could be off and needs to be adjusting, this is difficult to do if you have never worked on a system like this before.
The issue with the burner not turning off would have to do with the pressure switch, flow switch or the thermostat. With a pressure washer like this the power in the electrical system will run through these different items and either say light or don't light. More than likely if your burner is staying on though it is going to be the flow switch that is sticking, I am not the most formular with the system that they have on this machine but that is the first thing I would check.