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Old 01-18-2013, 08:27 PM
Rhatcher Rhatcher is offline
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Default burner shuts off, gas odor, Have replaced Coils
Model Number: WTVC6530UC/11   Brand: Bosch   Age: 1 - 5 years   

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Originally posted asking for help with removing front cover. Remove Bosch Dryer Front Panel
Now Iím troubleshooting the actual problem and am starting a new post with more descriptive subject line for people searching for similar.

Run Sequence:
00 Sec Press Start, drum turns
09 sec igniter lights
16 sec burner lights with a nice blue flame, ignitor fades.
in less than a min the flame starts to get a little orange in it and starts to diminish a little. The flame continues to weaken until it shuts off.
4 min 32 sec flame shuts off, gas smell
5 min 12 sec igniter lights
5 min 18 sec flame shuts off

The ignition sequence will repeat shortly and again the flame will shut of immediately.

If I run the dryer on air(no heat) for a minuet to cool it (and evacuate the gas) it will start normally and again run for about 4:30 before failing.


The dryer vent path is clear.

I have replace the Gas Valve Coils and thoroughly cleaned the vent path

From all of the other related posts It seems the gas valve is the next choice but i hate to replace it and find it is something else being it is the most expensive option.
It seems to me that this is a heat sensitivity issue. Something is breaking down after the area gets warm. Once the dryer cools completely it will start up normally.

The dryer is only two years old. There has always been a relatively loud buzzing noise when the gas is flowing. It reminded me a bad solenoid. Since this problem started we do not hear the buzzing. Iím starting to think something was wrong all along and whatever it was has finally bought the farm.

So one question is; was that buzzing sound normal? I had my previous gas dryer for over twenty years and never head that buzzing.

Also I have a tankless hot water heater that works fine and several other working gas appliances so I'm confident that the gas supply is good.

thanks for any help.
Robert


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