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Heater won't fire

I have a kerosene heater that won't fire. I replaced the coil and some pump parts. It's getting fuel and spark and seems like it's trying to fire but just won't kick in all the way. Any help would be appreciated

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Re: Heater won't fire

Place some kerosene into a small bowl, then place the fuel line drictly into the bowl . this way you can tell your getting good fuel. if no fire try removing the fuel filter. my filter was bad on mine i turned my upside down and it fixed it. its a in line filter.

Posted on Dec 23, 2008

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Re: Heater won't fire

Not knowing what kind of heater you are trying to fix, lets look at the basics. Fuel, Ignition and Oxygen. You say you have fuel and spark, how about air? Too much fuel will not allow the unit to fire as well. Have you checked the fuel filter if there is one?

Posted on Nov 17, 2007

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I have a 35,000 btu Reddy heater that won't fire at the spark plug but is getting a signal from the magneto. Is the magneto bad or does the spark plug have to be in the mist of kerosene to spark?

  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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