Question about Reddy 165000btu Kero Heater

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Pump pressure won't go above 2.5psi.

My heater turns on and tries to run but it only runs for a few seconds and turns off. I replaced the rotor, filters, and end covers. I checked the pump pressure and have tried to adjust it many times but it will not go above 2.5psi. It is supposed to be set at 5.6psi. Any suggestions?

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Re: Pump pressure won't go above 2.5psi.

Here is the link to the manual if you need it. I guess you have gone through all the pump pressure procedure as they describe on page 7. Check if you definitely have a seal around the pump plate and at the shaft etc. Check if the blades actually do fit or possibly are an incorrect size, and that any gaskets or seals are not the incorrect thickness giving a gap down the sides of the blades. check that lubricating grease etc. is not clogging normal blade operation. check all inlets/outlets are clear it sounds to me like the problem has to be inside the pump. unless there is something fundamentally wrong with the motor or it's power supply. Hope this helps :)

Posted on Mar 14, 2007

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Will not pick up fuel to fire up

Your unit has a air pump behind the electric fan motor. This pump is what produces low pressure air across the nozzle which causes a suction for the fuel pick up tube from the tank. Check your fuel filter first. If you are not getting any fuel spraying out the end of the heater, your air pump needs to be looked at. There are carbon vanes on a rotor inside the pump. They could be stuck in the slots of the rotor. Don't mess with any of the plastic plugs on the back cover unless you have the tools to test. Just remove the steel screws that hold the cover on. There will be another set of screw inside,remove them to get to the rotor and carbon vanes. If they are not stuck, your air pump may just need to be turned up. You will need a 10 lb. pressure gauge to test the pressure. It screws in to the 1/8" threaded hole (usually has a plasic plug) thats where the gauge screws in. The pressure on most heaters is 5.5 to 6 lbs. setting. The adjustment is the plug above the gauge test port. Turn clockwise to increase pressure/ counter clockwise to decrease pressure. Be careful because this will also increase more fuel to the combustion chamber. If turned up to high, you will get a large flame shooting out the end of the heater. If you do not have experience with working on the heater, and do not feel comfortable doing it, get someone else to help you that does. Good luck.

Jan 03, 2011 | Reddy Heater-170,000 BTU Kerosene Deluxe

1 Answer

Plug it in runs fine for a few minutes and cuts off. unplug it for 10 minutes, plug it back in starts to run and cuts off.

Try this link for service manuals:

If the unit runs for just a few minutes you could have a bad safety switch but you need to make sure you have the correct pump pressure.

Try putting your finger over the pump adjustment screw and see if you hear the heater become louder. If you do not hear a change in the sound of the heater you may have a problem with your end cover or pump pressure.

If you still need help you can call customer service at 1-800-475-5660

Nov 06, 2010 | Reddy Heater-70,000 BTU Kerosene w/T'stat

1 Answer

No fuel spray, it sprays if i pressurise the fuel tank.

Follow this link. It sounds as if the rotor (air pump) is broken and needs to be replaced. Replace the rotor, then set the pump pressure with a low pressure gauge..
How to replace a rotor

How to set the pump pressure

Good luck!

Oct 18, 2010 | All-Pro Kerosene Garage Shop Heaters - All...

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Dayton 70,000 btu kerosene heater only runs consistently with 3/4 of a tank of fuel or more. Once it is below 3/4 it keeps shutting off. I have cleaned filters, tried to set pressure but pressure won't go...

If you can only get 4 psi from the pump then you have a problem with the rotor. This could be from the vanes not coming out properly of if you have replaced or serviced the rotor you may not have the clearance set properly between the pump ring and the top of the rotor.
Make sure to inspect the pump cover for any small cracks..

If you pump pressure in not enough the unit will not be able to pull fuel from the tank and you will see the burner cone slowly start to go from the orange color to a dark color and the unit will shut down.

Feb 10, 2010 | Dayton (3E386) Heater

1 Answer

110,000 heater will run for 15 seconds,will not fire

The rotor in the pump assembly may have broken or cracked and is binding the rotation of the motor. The pump assembly can be removed to inspect, clean and replace any parts that are damaged. The manual will step you through this procedure and can be done in a short period of time. Your local hardware store may be the replacement parts on the shelve.

Mar 28, 2009 | Reddy Heater-170,000 BTU Kerosene Deluxe

1 Answer

Reddy Heater runs but will not ignite with bonnet attached.

First, let me say that the general principal of fuel delivery ***to the spark plug*** depends on several things.
  1. Proper air pressure at the nozzle (provided by the rotor/motor)
  2. Proper “fuel pattern” at the nozzle (provided by the rotor/motor/nozzle)
  3. Proper amount of ***air & fuel*** at the nozzle (provided by the rotor/motor/nozzle)
  4. Proper ***air flow (cfm) through the combustion chamber (provided by the fan blade/motor)
  5. Proper rpm’s of the motor, which affects all of the above.

On your heater the first step is to set the air pressure to specs. Instructions are on the website. This pressure setting directly affects fuel delivery & fuel atomization

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

  • Next, if the fan is OK (correct & intact) look at the NOZZLE. DESA recommends annual replacement of the nozzle, which is a wear item. Naturally, annual usage varies, so, wear will depend on annual usage. A worn nozzle produces a cone shaped SPRAY rather than a cone shaped FOG. A spray drowns the spark, where a fog gets ignited, provided it contacts the spark. ALSO, the pattern from a worn nozzle can completely miss the spark (combustion??? Hardly!). When the top is lifted the change in airflow allows a false correction in the combustion chamber, allowing combustion, but when the top is replaced the flame is extinguished. A restricted nozzle or a restricted fuel filter will also distort the fuel pattern and create the same symptom. Also, like the fan blade, make sure that the correct nozzle is installed. Nozzles get swapped, too.

Dec 12, 2008 | Reddy Heaters

1 Answer

Reddy heater 70,000 with factory thermostat will run a few

Set the pump pressure. If correct check the nozzle. Desa recommends annual replacement.

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.

Dec 12, 2008 | All-Pro Forced Air Kerosene Space Heater...

1 Answer

Can not adjust air pressure to keep it running!!

Provided the rotor and vanes are serviceable the pump should produce around 10 psi if you completely close off the airline tubing. If your gauge will not read with the tubing totally restricted, then I would check the relief valve to see if the ball is in first, then the spring, then the screw with the hole. These items should be in the longer of the 2 bosses. If no pressure reading at this time you either have a broken rotor or a defective gauge.

If you get some pressure with the tubing restricted, but there is not enough, then use soapy water to find the air leak. If there is a crack in the plastic end cover- replace it.

How to set the pump pressure

Dec 11, 2008 | Reddy R155D Utility Heater

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