Question about Reddy HEATER R115 115,000-BTU PORTABLE KEROSENE FORCED AIR HEATER

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Heater won't start

After being plugged in, the heater hums as though it wants to start, but after a few seconds it stops. This happened suddenly. It was working fine the day before.

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Thanks for your question,
Sounds to me like you have a faulty fan in the unit, could be stuck, or might be a bad fan motor, try unplugging it first, find something to insert where the fan is and try spinning the blade, if its stuck or has alot of resistance, then you have a bad motor, if its free spinning, then try plugging it back in and see if it works, sometimes just by manually moving the motor shaft it frees it to work, if it still doesnt work, then you might look at replacing the fan motor, or replacing the unit, hope this helps ya,
mr.grzz

Posted on Jan 25, 2009

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115,000 btu reddy heater, 5 hrs used in sprayfoam-grinding environment. stopped working. when plugged in, only hums for a few seconds, then stops. how can i fix that?


First, remove the top cover. Inspect for a varmint nest. If clear, manually spin the fan. If it does not you either have a broken rotor that is binding or you have a bad bearing.

If it spins freely, apply power- see if the motor runs with the top cover removed.
If YES, replace the top cover. Its possible that the top is binding the fan.
If NO, the start capacitor is defective. The cap on R115 is internal and is not servicable.

Reading material about a hummer

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1 Answer

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When you say the heater hums is the fan turning? Providing the fan is turning remove the top cover on the heater. Turn the heater on and watch the back of the burner area. Do you see any fuel mist coming from the nozzle? Do you see the ignitor sparking or glowing. Providing you see the ignitor working check the air pressure on the back on the unit. Remove the plug on the back of the unit that does not have a hole drilled in it. Insert a gauge into the hole (1/8" pipe thread) The pressure should be 5 to 6 psi. Let me know what you find and I can tell you how to proceed from there.

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When the heater hums is the fan turning. If it is I would add more Kerosene. There is no shut off but the Kerosene is sucked out a tube from the top of the tank. This tube does not reach quite all the way to the bottom of the tank. Your heater should hold about 9 gallons if it is empty. A couple of gallons would give it plenty to run though. Let me know.

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You don't state whether this heater has the old style spark plug technology or the newer Hot Surface Ignitor technology. Troubleshooting will be different, depending on the style of heater, because the electronics are different.

You ask "what are the two adjustments screw heads on the back of heater". As stated by tros1 these are A. an air pump adjustment screw, and B. a pressure relief valve.


Both technologies require correct pump pressure in order to deliver the fuel at the proper rate. For a pressure setting video
http://youtube.com/watch?v=NeM3Yi9Y1oE

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try this, take off the top cover. plug in the heater and when the humming starts, rotate the fan sharply with a screwdriver. keep your fingers away from the fan. if the fan spins under power your start winding is shot. get a new motor. www dot desatech dot com

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