Sorry for your prob, Conklin. It's a bit of a tricky one. Here's what the WIKI page has to say about it.
forum.iburncorn.com/wiki/index.php/Bixby...or_Lights_.233_.26_5
Does this help?
Let us know how you make out.
"Lights #3 & 4 , or Lights #3 & 5
From Tomorokoshi
forum.iburncorn.com/viewtopic.php?t=5312: "A #3 light all by itself means the stove was operating too hot and opened the snap switch on the exhaust manifold. This cuts power to the feed motor. This is detected when the feed motor is attempted to be run, which makes the error show up. However, there is another way to detect the stove running too hot - via the thermocouple in the exhaust. The test and safety specification the stove complies to limits how high the exhaust gas can be. If the stove approaches this temperature, it will try to do the high temperature pull back mode. If the stove is not able to pull back in time, which is about 5 minutes, it will display the #3 and #5 lights. This was done so I could answer exactly this kind of question - instead of chasing around a #3, which is really hard to do. By the way, a #3, #4 is the same issue except during startup mode. There are a few things you can do: 1) Is the stove in a warm room? Ambient temperatures in the +80 F range can be trouble some. Use a fan to get the heat out of the room. 2) Wait for cooler temperatures before going as high as level 8. 3) Check the fuel fill of the burn pot - if it is high, the pullback mode will not be able to do anything if there is a large charge of fuel. 4) Watch the stove - there is only a short window to catch it. When it is in pullback mode the LEDs should flash like they do if the thermostat is telling it to be cool. 5) Attach a thermostat to keep the ambient temperature in the room a little cooler. Once it gets cool outside, it should stop happening."
According to Rona, if the #3&5 error was preceded by increasing incidence of #2&3 shutdowns, suspect a blocked flue, blocked ventcap, or blockage behind the convection tubes. [ Maintenance Schedule ]"
