Question about Desa International ReddyHeater® R115DT Utility

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Reddyheater r100 My heater will run if you open the top cover,but when you close the cover the flame goes out.I have replaced the nozzle,plug,and filters.any ideas? thanks

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  • frank55 Dec 28, 2007

    I have the same problem I have rebuilt the air pump, replaced the spark plug, replaced the injector nozzle replaced the filters. If i turn the air pressure all the way up it will run but at a weak temperature and if it cycles it will not relight. If i remove the cover it will light and run fine but the pressure still has to be about 6 psi. It seems that there is deflection of the air as you slide the cover from back to front that is causing turbulance that is blowing out the flame. The fan is runnig fine at all points of operation. The combustion chamber is clean and unrestricted. There is no dents or bent material. I am at wits end with this and need a GOOD explanation as to what may be wrong

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The fan must be hitting th upper cowling. see that the fan bracket is fully seated in the cutouts in the lower half of the unit.

Posted on Dec 27, 2007

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When i take the top of my reddy hearter off it will start right up . but when it is on it will not start>


A worn nozzle creates a spray pattern, where a good nozzle creates a fog.With a coarse spray pattern poor combustion results in an off colorflame, . The photocelldoesn't like the color, sends a signal to the computer whichshuts everything down. That's the job of the electronics. On HSI ( hot surfaceignitor) heaters it is all about correct flame color , not just flame. The part where you write "If I remove the cover again it runsfine" is a symptom of a bad, worn, or restricted nozzle (generally).Remember- the ignitor only stays red for 5 seconds, then the flame keeps itselflit. The nozzle's pattern is a cone. Lift the lid & the pattern widens(aerodynamics) - replace the lid and the cone narrows & possibly distortsthen the flame goes out. This nozzle rule will only apply if everything is correct as far asfuel delivery applies. The pump pressure must be correct- not almost correct.Set the pressure with a low-pressure gauge that registers12-15 psi max. A gaugewith a higher scale just will not read close enough to satisfy the system. If the pressure is not correct, the aboverule will not apply. Instructionsfor setting the pressure can be viewed at http://reddyparts.com/pressure.htm. In addition, a fan can cause the same problem if damaged ormis-matched to your specific model. I must mention that any air leaks onthe pressure side (or vacuum leaks on the fuel line, for that matter) betweenthe pump and the nozzle will create a rich/lean mixture at the combustionchamber, creating an off-color flame.

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I plug my reddy heater in and it comes on then shuts back off. What is the problem?


Try cleaning the flame sensor. Remove the top of the heater. The flame sensor is a black rubber boot close to the fuel nozzle. Pull is out of it's holder and use a soft cloth or cotton swab to reach into the openning and clean the eye. While you have the top off, watch out for the fan and turn the heater on and use a flashlight to look for fuel spraying from the fuel nozzle into the burn and make sure the igniter is working. I don't know which type you have but it may be the spark plug type or a hot surface igniter which should just glow red hot. Let me know what you find.

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Heater does not fire or run while top cover is on. take it off it runs perfect try to put the cover on while running it shuts off.


The air pump pressure could be off a little causing incorrect fuel delivery. Follow this link for instructions.

OR

The nozzle could be worn to a point where a spray is being produced rather than a fog. By removing the top lid you are changing the aerodynamics and the safety system likes the color of the flame (falsely). Replace the nozzle. Follow this link.

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this unit has neither flame sensor or oxygen sensor.it has an photo cell in it.look at the plate that is on the back of unit.that is the air pump filter cover.if you look very closly you will probbaly see tiny cracks around one of the holes,either the adjuster or the plug.these covers crack all the time and they are not noticeable.when they crack it changes the air pressure and the unit doesn't work right.let me know and i hope this was helpful to you.

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I have a reddy heat r100 when I have the top cowl off everything runs fine as soon as I replace the cowl and plug it in the fan starts and then the overload switch trips


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1 Answer

165,000 forced air reddy heater


It would help if I knew the model of heater because there are 2 different technologies that are used in Reddy Heaters. Having more information could affect my answer.

Generally, if a heater runs with the lid off but shuts down with the lid on, its a sign that either the air pump pressure is not to specs or the nozzle is restricted or worn out. Desa International, the manufacturer, recommends annual replacement of the nozzle, but this is arguable, depending on the age of the heater.

I am pasting a document that I've had around for awhile, that may help:

"A worn nozzle creates a spray pattern, where a good nozzle creates a fog. With a coarse spray pattern poor combustion results in an off color flame, . The photocell doesn’t like the color, sends a signal to the computer which shuts everything down. That’s the job of the electronics. On HSI heaters it is all about correct flame color , not just flame.

The part where you write "If I remove the cover again it runs fine" is a symptom of a bad, worn, or restricted nozzle. Remember- the ignitor only stays red for 5 seconds, then the flame keeps itself lit. The nozzle's pattern is a cone. Lift the lid & the pattern widens (aerodynamics) - replace the lid and the cone narrows & possibly distorts then the flame goes out.

This nozzle rule will only apply if everything is correct as far as fuel delivery applies. The pump pressure must be correct- not almost correct. Set the pressure with a low-pressure gauge that registers12-15 psi max. A gauge with a higher scale just will not read close enough to satisfy the system. If the pressure is not correct, the above rule will not apply. Instructions for setting the pressure can be viewed at http://reddyparts.com/pressure.htm.

In addition, a fan can cause the same problem if damaged or mis-matched to your specific model.

I must mention that any air leaks on the pressure side (or vacuum leaks on the fuel line, for that matter) between the pump and the nozzle will create a rich/lean mixture at the combustion chamber, creating an off-color flame."

Good luck, I hope this helps.

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1 Answer

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