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Old 11-13-2009, 12:54 PM   #1
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Duo Therm Oil Furnace problem


I have a Duo Therm oil fired furnace which I have changed the pump and nozzle. It fires up and run great foe 24-36hrs then shuts down. When it starts up after resetting it rumbles. The electrodes are rounded at the tips and approx 3/16" apart. Any sugestions on what to do next.

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Old 11-13-2009, 01:06 PM   #2
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Duo Therm Oil Furnace problem


Hate to say it but you would be better off to get a Pro to check it and set it up properly with a combustion analyzer. When it rumbles that can be dangerous as you may be getting delayed ignition or have an excess of unburnt oil in the chamber from a bad spray pattern and that is dangerous. Not something we can talk you thru on the net.

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Old 11-13-2009, 01:21 PM   #3
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Duo Therm Oil Furnace problem


It rumbles and then starts up, it does not shut down on start up.
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Old 11-13-2009, 02:45 PM   #4
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Duo Therm Oil Furnace problem


Rumble=uncontrolled fire.
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Old 11-13-2009, 02:56 PM   #5
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Duo Therm Oil Furnace problem


Could it be that the electrodes are worn down as they have rounded tips. I was told they should be pointy and 1/8" apart. Could that make an intermitend problem?
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Old 11-13-2009, 03:30 PM   #6
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Duo Therm Oil Furnace problem


Along with many other things.

After you changed your nozzle and pump.
What was your CO2 reading, and what was the draft over the fire.
Too low on one will cause this also. And too high on the other does also.

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