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First of all are you running kerosene or diesel ? If you are using diesel, it does not burn as clean as kerosene which causes that burning rich smell. If you are going to use diesel, just use #1 diesel only but still may have a little rich smell. Don't use die red off road diesel. If you are using kerosene and want to check your air pressure on your pump, you will need a 10 lb. test gauge with a 1/8" NPT male pipe thread on the end of the gauge.There are 2 plugs on the back plate. Do not remove the upper plug with the hole in it. This is the adjustment screw for pressure. Clockwise increases pressure, counter clockwise decreases pressure. With the heater unplugged,remove the lower plug. Screw the test gauge in and start the heater. Check the pressure. Most are set between 5 1/2 and 6 lb. of pressure. Check your owners manual to see what your setting should be. If your pressure does not change, you have a worn pump and it would have to be repaired. Once you have the correct setting, unplug the heater, remove the gauge and install the plug back. If you feel that you are not qualified to perform this procedure, send it in to a local repair center.
It sounds like the bearings have gone bad in the jet pump. A shaft seal leak will sometimes let water get into the bearings and the motor will get louder and louder. Running it on high can intensify the noise and heat created by bad bearings. Eventually, the bearings will seize and the motor will try to turn and since it can't, it will get really hot. The motor has built in high limits to keep from burning up completely but it will smell like it's burning. I would replace the pump motor and seal, should take care of the problem. The OH may have been caused by the pump not moving enough water to run the heater and tripped the heaters high temp sensor. I hope this helps.
This is going to be a user program:
1) press and hold both light and dark keys
a) the 2 buttons to lighten and darken copies
b) hold both for 5 sec until indicators light up
2) use the left copy quantity key show 2
3) press your copy key
4) use the right quantity key to change to 2 (max 90 sec)
5) press the copy key
repeat step 2 but change to 3 with left quantity key
press the copy key
change right number to (4 = 60 min, 1 is default at 5 min) then press your copy key.
Once done press both light and dark key again to exit
Note*** changing shut off timer and preheat will effect copy lamp ready state. Every 60 sec or so the scanner will move and reset. Some people do not like the noise is makes all the time. If you don't you can always change it back to the defaults. 2=0 and 3=1.
You didn't mention the model number, but they are all pretty basic. The flame sensor and thermo pile which are thin flame sensors, get charred and need to be cleaned. They should be cleaned with a soft cloth or even a dollar bill will work (a worn one)
When the heater shuts down it usually means it is not sensing the flame and this will cause it to shut off automatically. I have included a link to get the owners manual below.
check the photo eye. It's the little rubber boot on the bottom right on the back side of the burner. If it's dirty, it may not be shutting off the igniter. If the igniter runs continuously, the safety breaker will trip.
Keep it unplugged and look for burned wires, or rubber wires hardened from extreme heat. This will be a good start in finding what is going wrong. One more thing to check is if the compressor is heating up after running for a while. Let it run for 20 min or so, shut off the power and feel the compressor. Is it hot?