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Reddy Heater runs but will not ignite with bonnet attached.

Heater motor would run but heater would not ignite. I took the bonnet off, cleaned the nozzel and the filter the comes from tank/line. When plugged in without bonnet, heater motor runs, ignites and heats fine. WITH BONNET ON HEATER motor runs but heater will not ignite. What is the problem? What can I do to fix it?

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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 www.reddyparts.com 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 http://reddyparts.com/pressure.htm.

  • 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.


Posted on Dec 12, 2008

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