Question about Rinnai Toyostove Direct Vent Heater: Toyostove Laser 73 Shipping

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Toyostove laser 73error codes

I have an error code6 on my toyo73 stove. I cleaned the combustion chamber, cleaned out fuel nozzle, cleaned heat exchanger, cleaned fans,and reassemble the stove. The stove ran for about 15 hours. This morning I had another error 6 code.
I notice when I cleaned out the heat exchanger (yesterday )that some of the stainless steel tubes were plugged up. I cleared out the tubes I could get to, I imagine I'll need a new heat exchanger soon. What else would cause the error6 code?

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  • Anonymous Jan 05, 2009

    Same problem as described.

    ERROR 6 is displayed unexplainably.

  • delta sparky Jan 07, 2009

    The problem I had with the error 6 was resolved by checking the exhust flue and finding a hole between the exhust and the fresh air intake. The heater was sucking in exhust air. This was causing incompleate burning of the fuel thus the stove shutting down.

    I have not found in my research of this problem or any other problem for that matter to check the exhust flue as a possible cause of error codes.

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EE 6 can be some kind of obstruction in the fuel line causing the fuel to not reach the heater. It could be the high limit switch being activated. For that they say clean the fan, and fan cover. Your tank could be too high. The fuel sump valve could be malfunctioning. I think you would need to replace the pump for that. (It probably is not that as your heater does run for a while.) Finally it could be a flame sensor malfunction. Did you notice if there is a lot of carbon built up in your heat pot? It could be building up on the flame rod, causing the heater to not be able to sense a flame. Is your burner ring (the metal thing that sets inside the heat pot) warped? This will cause your heater to go out from time to time as the fame burns erratic and too hot, building up more carbon. Replacing that burner ring if it is warped could solve all your problems. You might wantt o replace the burner mat while you are at it.
:)

Posted on Jan 05, 2009

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Help- when heater gets to room temp. the circulating fan stops, but fire remains in combustion chamber and the blower motor or exhaust fan continues to run for hours. Toyostive laser 56MH thanks Jim...


Sir,

If there was a flame in the burner and no circulating fan running the stove would over heat in less than 5 minutes. It would show an EE 6 message. Are you sure there is a flame in the pot? The stove does have a safety feature that allows the combustion fan and circulating fan to run continuously in certain cases. This is a rather extreme case. In any event the circulating fan would be running at the same time the combustion fan was on. To get out of that mode turn the stove off and on again. Now you should be able to restart normally. Keep us posted,

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Hi EJAKFbanks,

I believe by your description and my 8 years experience with Toyo Stove repair that you are missing part of the firing sequence. The firing sequence for a Toyo Stove L 56 is to blink on the burner light for 7-9 minutes, then it clicks up to the medium light (amber-yellow color). The medium light blinks and that is when the fuel pump kicks on and starts to pump. If the stove ignites, the medium light will glow for a second and then drop down to the low light (green) The low light will burn for awhile and at this time you will see a blue flame in the newer heat chamber models or a red glow, and perhaps some blue flame in the older heat chamber models, then the stove will kick up to the medium light for a bit, and then to the high light. An EE6 error code will show only when the flame is extinguished after actually taking place and a burn did occur in the chamber on low. An EE6 is usually one of 2 things: 1. There is an inadequate fuel supply for the stove to maintain a low cycle burn, or the medium, or high. Each cycle consumes more fuel than the prior one. Inadequate fuel supply can be due to a restriction in the fuel line such as icing like cholesterol in a persons arteries, or a plugged sump screen, blocked fuel line or filter, too low a quantity of fuel in the tank, or a fuel line that is not all gravity feed, as in, the fuel line runs down, down, and then up a few feet to get to the Toyo. In that case, the fuel has to rely on head pressure to get to the stove. Head pressure is the atmospheric pressure pushing on the fuel in the tank to force it up against the earth's gravity forces. Solution: You can find any restriction in the line, replace the filters, clean the sump screen, put heat on the fuel line to thaw any icing blocks. 2. An EE6 can be caused by a carbon chain developing from the burner ring, flame sensor or chamber wall to any metal part in the burn chamber. A carbon chain essentially "shorts" out the ground for the unit and the Toyo will shut off on EE6. Solutions:You can bang the side of the Toyo (Old frustrated Alaskan solution) which really just jars the carbon chain loose, clean the flame sensor, clean the fuel nozzle with a straight 3 inch wire, and stick a screw driver in the igniter (red wires) hole and rattle it around real good (another old Alaskan trick). Often, those three things will get your stove running again if it is a carbon chain. The problem will likely occur again, but it will buy you some time until you can get a tune-up done. Most likely, you need a tune-up. Question: When was your last tune-up? Toyo's should be tuned up every 2 years. Tthe book says every one year, but in my experience, every two years is the best bang for the customers buck. The three year mark usually begins showing signs of metal fatigue in other parts of the burn chamber/heat exchanger system so the costs rise a little each year, unless you are a lucky Toyo owner and for some odd reason, your stove can go 3 years between cleanings without any ill effect. If you get your stove running, run it hard on High for about 2 hours to clean and burn all the carbon out. Good Luck! toyotech, North Pole, Alaska

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