Question about Desa International Kerosene Portable Forced-Air Heater

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Pump pressure can not increase pressure by turning screw in,only has 1 lb pressure so shuts off

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Check your filters to see if they are clogged. It also could be a defective rotor. If you need a new filter kit or rotor. You can find them online at www.masterparts.net if you need the part numbers you will have to call there parts department at 888-917-2244.

I hope this helps...

Posted on Mar 06, 2009

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Throw it away, i have 6 desa heaters that cost me more in maitenance than a new one trow it away and buy a new one

Posted on Jan 08, 2009

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I have a MASTER MH-75T-KFA kerosene forced air heater that runs a few seconds and shuts off. Air filter is clean and even does this with filter removed. Manual says fuel pressure should be 4.o psi. Guage...


I assume this has an electric blower and probably electric fuel pump? Does it have a fuel filter somewhere in the system? I'd try to return the fuel pressure adj. screw to factory setting. I'm guessing screw in decreased flow rate and out increases flow rate. If fuel pressure is measured on the burner side, then increasing flow rate should increase pressure. It's intuitively backwards. What does customer service say? Usually, they are helpful. They need to know there's a customer problem.

Feb 28, 2015 | Heaters

1 Answer

Starts then shuts off


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.
or
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.

Feb 17, 2015 | Reddy R60A Utility Heater

1 Answer

Starts then shuts down


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.
or
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.

Mar 02, 2014 | Reddy Heater-170,000 BTU Kerosene Deluxe

1 Answer

My kerosene torpedo heater turns on but then it dies after five seconds


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.
or
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.

Jan 08, 2012 | Reddy Heater-70,000 BTU Kerosene w/T'stat

1 Answer

My Mr Heater Buddy heater 4000 to 9000 btu unit work fine with 1 lb propane tank but when I connect it to my 20 lb tank with hose it will not stay lit. Acts like there is not enough gas pressure. My 20 lb...


it could be down to the draw off the tank pipe too small or reg is not for a 20lb tank , going to lock out check reg pressure should say on the side , or take hoes and reg off tank , put it back on and turn gas on slowly see if this helps

Jan 30, 2011 | Mr. Heater Mr Heater Portable Buddy...

1 Answer

Running very rich. how to adjust fuel and air screw


First of all are you running kerosene or diesel ? If you are using diesel, it does not burn as clean as kerosene which causes that burning rich smell. If you are going to use diesel, just use #1 diesel only but still may have a little rich smell. Don't use die red off road diesel. If you are using kerosene and want to check your air pressure on your pump, you will need a 10 lb. test gauge with a 1/8" NPT male pipe thread on the end of the gauge.There are 2 plugs on the back plate. Do not remove the upper plug with the hole in it. This is the adjustment screw for pressure. Clockwise increases pressure, counter clockwise decreases pressure. With the heater unplugged,remove the lower plug. Screw the test gauge in and start the heater. Check the pressure. Most are set between 5 1/2 and 6 lb. of pressure. Check your owners manual to see what your setting should be. If your pressure does not change, you have a worn pump and it would have to be repaired. Once you have the correct setting, unplug the heater, remove the gauge and install the plug back. If you feel that you are not qualified to perform this procedure, send it in to a local repair center.

Jan 11, 2011 | Reddy Heater-170,000 BTU Kerosene Deluxe

1 Answer

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

I HAVE A DAYTON 3VE49 TURN IT ON FAN RUNS GETS SPARK BUT IT SEEMS TO NOT BE GETTING FUEL I HAVE TO BLOW AIR THRU THE FAN PUMP HOSE TO FORCE THE FUEL TO THE SPARK I CHECKED THE LINES CLEAR THE PROP INSIDE...


Check the fuel lines and the nozzle. Make sure there are no leaks from the air/fuel lines at the nozzle fittings or air pump. The air pressure from the pump is no where near what you forced to the nozzle with an air compressor. You can push fuel past a plugged nozzle to get it to fire with your compressor, but the air pump can not even if it's new. Check the lines for leaks with soapy water. take off the nozzle and clean it to be sure it isn't plugged. Dont loose the spring inside to nozzle. Check the pressure at the pump testing port. You can buy a gage as descibed below at an ATV dealer. use a valve stem with 1/4 threaded end and a shrader valve at the other to adapt this for testing. Extra low pressure pencil-type gauge registers 1-20 psi in 1/2 lb. units. Do not use a standard tire gage, They are not accurate at low pressures.


Good Luck

Dec 23, 2010 | Dayton E48 Oil Filled Utility Heater

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

Nov 06, 2010 | Reddy Heaters

1 Answer

I HAVE A R165DT{MULTI FUEL USE} READY HEATER. HEATER IGNITORCOMES ON BUT WHEN FAN COMES ON AND FUEL STARTS COMING OUT HEATER QUITS. HAVECLEANED THE PHOTO CELL, CHECKED FUEL LINES,FILTERS, AND JUMPED PHOTO...


sounds like your pressure is too low. on the back of your heater is a yellow plug with a slot for a screwdriver. turn it about a full turn and see if it will run. the other yelow plug is where you can put in a pressure gauge and see the pressure of your pump. you should put a gage in the hole and then turn the other plug unitil you increase the presure and a 1/2lb.

Feb 11, 2010 | Desa International RH125AT Utility Heater

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