Question about Reddy R155D Utility Heater

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R155 and unburnt Kerosene

I used my R155 kerosene heater for years in my garage without any problems. Then the 097061-01 solid state relay went out. I replaced it with new part number 107850-01. At the same time, I also figured I would replace the filters, gasket, (HA3017) and the rotor (HA3004). When putting it back together, I used the HA1182 low pressure gauge I bought to set the psi to 5.0 psi like the manual said. Upon doing this, it would only blow out a cloud of atomized kerosene and not light. If I put my finger over the adjustment screw and let the pressure increase toward 10 psi, it would light but then go out as it returned to 5.0. I tried increasing the pressure. At ~6 psi would allow it to stay lit but your eyes burned from unburnt kerosene as it ran longer and longer. I decided to replace the other components related to the fuel air mixture (HA3010 nozzle and PP211 spark plug). No improvement. I increased the pressure to 8.5 psi which made the end cap glow slightly but it would stay lit and not put out a cloud as it tried to start. While running at 8.5, slowly you notice a sore throat and burning eyes from the unburnt kerosene. Can you help give me some guidance as to what is wrong or what to check???

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  • Vicious6 Feb 17, 2008

    I have the older model which is doing the same thing, mine is the R155A. I have replaced the plug, cleaned the nozzle, replaced the fuel filter, set the fuel pressure and cleaned the lint filter and so on. I am starting to think there may be a rotor problem. It will burn your eyes out when it does run, when it does not it smokes up the entire garage. This must be a common problem with these things.

  • cjwert Feb 21, 2008

    Is there a specification for the plug gap and for the depth of the tip?
    If not, do you just keep adding shims to back up the plug until it
    won't stay lit???





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Check plug gap and depth of the tip. The spark may be to far into the fuel spray flooding it out. DESA says use a standard spark plug washer or two for shims if needed.

Posted on Feb 21, 2008

  • Todd Gibb Feb 22, 2008

    The gap is .075 inch. No spec on depth just enough that the plug doesn't foul with carbon or become wet with fuel. Good Luck.



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