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Old 06-11-2014, 09:39 AM   #1
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black stoot on water heater grill

I have seen some mh tt and 5th wh with black stoot on the water heater grill as if they have flames coming from the wh .lam wondering what causes this to happen.
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Old 06-11-2014, 09:40 AM   #2
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Originally Posted by daywalker567 View Post
I have seen some mh tt and 5th wh with black stoot on the water heater grill as if they have flames coming from the wh .lam wondering what causes this to happen.

I was told this has something to do with insects or debris in the Venturi of the burner.
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Old 06-11-2014, 12:30 PM   #3
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Wait till it catches fire. It should burn off the soot. Seriously, get it looked after
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Old 06-11-2014, 03:25 PM   #4
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Soot is improper combustion, too much gas not enough air. Check the burner and burner flue for obstructions (Mud Dauber's,Wasp's, rust etc) If clean either the burner air shutter needs adjusted or gas pressure is wonky. If your cook top is not sooting up your pots then look at burner adjustments. You should have a blue flame with a small yellow tip if everything is adjusted correctly.
Good Luck
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Old 06-11-2014, 03:28 PM   #5
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Quote:
Originally Posted by gasman6674 View Post
Soot is improper combustion, too much gas not enough air. Check the burner and burner flue for obstructions (Mud Dauber's,Wasp's, rust etc) If clean either the burner air shutter needs adjusted or gas pressure is wonky. If your cook top is not sooting up your pots then look at burner adjustments. You should have a blue flame with a small yellow tip if everything is adjusted correctly.
Good Luck
X2. He nailed it.
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Old 06-11-2014, 03:33 PM   #6
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This is out of Sububans manual

A.
Main Burner: Do not allow the burner to burn with a yellow flame, because
sooting will occur. (See Safety W arnings). If the burner flame is yellow and has an
erratic pattern, shut unit down and contact a qualified service agency. Do not
continue operating unit with improper burner flame. (See Figure 11 for correct and
incorrect burner flame appearance.)

B.
Periodically inspect unit for soot. If soot is present anywhere on water heater,
immediately shut unit down and contact your dealer or a qualified service person.
Soot is a sign of incomplete combustion and m ust be corrected before operating
water heater. Areas to check would include:

1.
Check for an obstruction in burner or the flue box.

2.
Check the screen in the door to see that no foreign material has accumulated
to prevent flow of combustion and ventilating air.

3.
Check to be sure there is no flame present at burner orifice or burner whenever
main gas valve is closed. This can be checked by turning the OFF/ON switch to
the “OFF” position.

C.
Frequent checks should be m ade of the grommet on the gas inlet to assure
tight seal. (See “Making Gas Connections”).


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