Question about Desa International R70DT Oil Filled Utility Heater

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My Model R70DT will not light and run

When I plug unit up all I get is a Humming sound like the motor is frozen. I have removed the top and the motor does not turn free as it should which idicates to me it is a motor problem. I have in the past take motors of this tyoe apart and free them up using a good grade of oil to clean and lubicate them. In this case I do not have manual and I'm not sure what and how all the parts attached to back of motor work.
If I need to replace the motor where do I get one?
Could you please attach a manual for future use?
Thanks in advance for you help,
Brossie Jones

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Here is a link to the manual you requested... It could be that the pump rotor is binding. Check to see if there is debis in pump, if so blow it out with compressed air. Check the gap pn the rotor.(Adjust to .076/.101 mm) On page 14 of the owner's manual you can find pics and instruction on checking and servicing a pump rotor binding. If this does not work for you, then I suggest you contact Master Parts for the parts you will need. You can contact them toll free at 800-466-1446 or online at

Posted on Jul 13, 2009

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Posted on Jan 02, 2017

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Why would my Goodman LP furnace CAPF1824B6CA hum, but not kick on?

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Runs when started but won't stay running.

REAL FACT is: If all individual components of the heater are at 100% but the air pump pressure is not on it's mark, then the heater WILL NOT continue to run!
Air Pump Pressure is directly related to fuel delivery. Read that statement again! It is the most important line of text on this website.
If the pump pressure is incorrect, then, the fuel delivery will be incorrect. As a result, the heater will not run to specs.
Instructions for setting the air pump pressure:
Air pump pressure is the pulse of the heater. Pump pressures range from 3 psi to 6 psi depending on heater BTU size (see chart below). A loss of ONLY 1 psi translates to a 30% to 17% loss of FUEL FLOW (starvation). You must know the specified required pressure and set the pressure accordingly.
Heaters with Hot Surface Ignitor technology are extremely critical to pump pressure. If the pressure is off by 1/2 psi, the heater may run for 5 seconds, then shut down because of IGNITION FAILURE. The only way to correct this problem is to set the pump pressure to DESA's recommended pressure specification.
  1. The FIRST STEP in diagnosing any heater problem should be checking the output of the air pump. Determine the air pressure required for the heater model that is being tuned. The air pump, in turn, is responsible for fuel delivery.
  2. If you do not know the required pressure look for a decal on the side (usually) of your heater. This decal will state the model number, serial number, fuel capacity, pump pressure, etc.
  3. If your plastic end cover looks like this......
m29609t.jpgM29609 has 2 threaded holes. The hole on the left has a square plug inserted. Remove the plug. Screw in the nipple end of the gauge into the threaded hole. Check for air leaks with soapy water.
If your plastic end cover looks like this......
m16545t.jpgM16545 has 2 threaded holes. The shorter projection with a hole on the left has a square plug inserted. Remove the plug. Screw in the nipple end of the gauge into the threaded hole. Check for air leaks with soapy water.
4. The other hole (longer projection) has a screw with a hole which adjusts a ball and spring relief valve assembly. Carefully adjust the screw until the gauge is reading the pressure level that is specified on the heater's label. If operating properly, the pump should produce more pressure than is required to operate the heater. The relief valve allows the excess air to escape before being sent to the nozzle.
5. Replace plug. Test for leak.
6. If you are unable to reach the desired pressure spray soapy water around the seal of the end cover- at the same time check the plastic cover for a crack. A cracked end cover will not allow the heater to perform properly and will not allow for an accurate reading. The pump must be set at the specified pressure in order to have adequate fuel delivery an adequate fuel atomization. Replace if needed.
7. If you set the pressure to specs and the heater does not perform properly or the cone does not glow a soft red, then check for other fuel delivery problems such as a clogged fuel filter, cracked rubber hose, clogged or worn nozzle, or a cracked nozzle adapter. Soapy water lightly sprayed in these areas will quickly identify the problem most of the time. Any air leak will create problems.

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Not a solution, but a problem. I bought a 2078 from Big Lots 2mo. ago. Friday night, nothing. Checked plugin breakers, etc. Finally disaasmblrd the entire thing and checked every led,circuit, etc, and found nothing out of place or burnt. Now What? Taking it back to Big Lots today in a million pieces. Hope they can take a joke. Really like the outfit but need it to work.

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Darrell, there are 6 things that can be causing the problem.

1. Pump pressure incorrect.
2. Dirty air intake, air output, and/or lint filter.
3. Dirty fuel filter.
4. Obstruction in nozzle.
5. Photocell assembly not properly installed(not seeing the flame),
6. Dirty photocell lens.

To help you narrow this down, as well as the solutions to solving the problem. I am including a link to the Owner's Manual for your model heater, that you can download & print for future reference.. Pay particular attention to page 7 - Troubleshooting.

I hope this helped you. Please let me know.

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1 Answer

I have a 115000 heater and when I turn on the switch the unit just hums and then it sounds like it blows an internal breaker and the humming stops

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1 Answer

Hello i have a international harvester model 100 diesel portable torpedo haeter. my problem is that when i plug it in i get a humming noise and it doesnt start. can u please help????

Sounds like the fan/fuel pump motor is not turning so try this. Take the top section of the heater tube off, this exposes all of the internal working parts. Now locate the fan motor and fan, try turning the fan by hand, should spin nice and easy if not take a light oil or I like PB Buster and oil bearings on the shaft behind the fan, then first set in the front of the motor, then the bearings at the rear of the motor. You do this and spin the fan by hand as many times as it takes for that fan to spin freely. Then plug it in and try to fire it off, if it worked shut it off put it back together and happy heating. If not you may need a new fan motor or could be something in your fuel pump, usually it will be motor related .

Dec 20, 2010 | Heating & Cooling

1 Answer

I Have a Reddy Heater R70DT It runs for 15-20 seconds then shuts off I reset it by turning off Term. then turning it back on. Happens over and over. Thank You, Jim

This could be caused by low pump pressure but is more likely a bad control board part # 104068-02.

If you put your finger over the pump adjustment screw on the back of the motor you should be able to hear an increase in the sound of the heater.

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

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1 Answer

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1 Answer

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