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I have a Rheem (Criterion) unit and i'am having promblems with the main burner staying on. When i turn the unit on everything operates like it should up to the main burner staying on.Once the main flame kicks in it will stay on for five second and the flame will go out along with the draft moter( for about three second the trouble shooting light will flash four times) then the unit will start cycling all over again from draft moter purging, glow plug will operate like it suppose to up to the main gas. once the main burner kicks in the flame will stay on for five seconds and go out. This time the indoor fan will kick on and the unit will not cycle anymore. I changed the flame sensor and the control board and still the same problem what can i do next. thanks in advance

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  • Anonymous Jan 07, 2009

    I bypassed the plug, and ran the wire from the sensor down to the control board. The problem is still there. Once the flame goes out for the second time, the computer board LED trouble light stays constant and doesn't show a code. What could be the next step I can try? Do you think that the gas pressure would have anything to do with it? Thanks

  • Anonymous Jan 08, 2009

    It doesn't flash at all.

  • Danny Clark
    Danny Clark May 11, 2010

    Look for a flash code on the wiring diagram. What does it say 4 flashes are?





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Run a wire from the sensor down to the control board conector. Bypass the sensor wire around the connector in the blower deck.
The connection can be wire nutted on the sensor lead with the wire (16 or 18 guage stranded wire works) routed through the blower deck to the other side of the plastic wire connector on the blower deck.
The Sensor operates at high voltage but very low current. The connector will sometimes fail due to humidity or wear.
I have seen this on the Rheem or Ruud furnaces.
Hope this helps.
Matt

Posted on Jan 07, 2009

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