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Tech Tip: Kerosene Forced Air (KFA) Portable Heaters Not Firing
For the Mi-T-M Pressure Washer Certified Technician.
If your Kerosene Portable Heater is not firing, there could be a couple reasons causing this issue.
Possible Cause #1
If you are trying to light your KFA Portable Heater and you notice little or no air pressure registering on the pressure gauge, there may be an issue with one of the following components:
1. Air filter
2. Air hose
3. Air pump rotor
Solution:
– Check to make sure the air pump filters are clean.
– Check for a hole(s) in the air hose that connects the air pump to the burner nozzle. If you do not find any holes, remove and inspect the air pump rotor for cracks and damage.
– Replace the air hose or air pump rotor based on the root of the cause. When replacing the air pump rotor, you must set the proper gap at the top of the carbon rotor. To do this have the rotor in place and the outer steel ring loose, then place the .004 inch gauge between the top of the rotor and the bottom of the outer ring. Tighten the bolts in the steel ring.
– Next, rotate the air pump rotor clockwise and recheck the .004 inch air gap every 1⁄4 turn from the same top location.
– Reset the outer ring if any locations are less than .004 inch.
Possible Cause #2
If the proper air pressure is registering on the pressure gauge (see heater decal for proper pressure) and the heater sprays fuel, but you still cannot light up your KFA Heater, there may be an issue with one of the following components:
1. Control board
2. Igniter (which is mounted underneath the fan pictured below)
Solution:
Disconnect the igniter wires from the control board and check for voltage on the control board. The voltage will need to be checked within 1 – 3 seconds of turning the heater on/off switch to the on position. The voltmeter should read 120 volts AC. If there is no voltage, you will need to replace the control board. If voltage is present on the control board, that means that your igniter is more than likely the issue and you will need to replace it.