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Old 09-19-2012, 06:38 PM   #1
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Purpose of the water heater indicator light

What is the water heater indicator lights purpose? To tell you its ON or to tell you something else?
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Old 09-19-2012, 07:24 PM   #2
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On the LP side? Usually it's to tell you that there is a fault when the DSI tries to light the burner but can not.
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Old 09-19-2012, 07:28 PM   #3
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On our DSI unit the light comes on until the burner fires, then goes out. Have never seen it come back on after that.
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Old 09-19-2012, 07:35 PM   #4
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On our DSI unit the light comes on until the burner fires, then goes out. Have never seen it come back on after that.
Correct. As it's burning, shut off the gas. The light will come back on then.
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Old 09-19-2012, 07:43 PM   #5
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It doesn't matter if use LP or DSI. It doesn't seem to ever come on. After reading some Google stuff, I was thinking that its only an indicator if there's a problem and not to let you know that the water heater is on. Is that right?
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Old 09-19-2012, 08:22 PM   #6
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wh switch light

yes i belive you are correct. in my rig the light comes on when you turn the sw on till the gas lights then it goes out it comes on when the burner relights but only very short time. if the light stays on you need to check to see what,s wrong
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Old 09-20-2012, 12:41 AM   #7
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Funny. So I guess since it never comes on, everything is fine.....or its burnt out.
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Old 09-20-2012, 07:25 AM   #8
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When the WH is turned on, the indicator light remains on until the burner fires, then it goes out. If it comes back on while the switch is on, it means the burner cannot fire, an indicator of lack of fuel. In other words, light off good, light on bad.
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Old 09-20-2012, 07:40 AM   #9
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Hmmm....mine has 2 indicator lights. The switch itself is illuminated whenever the water heater's LP function is turned on. There's another indicator light on the switch backplate that only illuminates in a "failure to light" situation.

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Old 09-20-2012, 01:40 PM   #10
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Hmmm....mine has 2 indicator lights. The switch itself is illuminated whenever the water heater's LP function is turned on. There's another indicator light on the switch backplate that only illuminates in a "failure to light" situation.

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Fantastic..... Just when I was certain.

So, unless anyone states otherwise, the indicator light which sits inbetween the DSI and LP switches is only to let you know when there's a problem?
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Old 09-20-2012, 01:56 PM   #11
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If yours operates like mine, it's easy to tell. Turn the LP (propane) switch of the water heater to the "ON" position. 2 lights should be lit - the rocker switch itself and the backplate indicator light. When the water heater lights, the backplate indicator light (perhaps what you're referring to as the DSI light) should go out with the rocker switch light remaining illuminated to indicate that the LP (propane) function (as opposed to the 120VAC electric heating element) is turned on.

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Old 09-20-2012, 02:28 PM   #12
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Mine looks just like this.

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Old 09-20-2012, 02:39 PM   #13
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OK, in that case, ignore my posts. I have a Suburban WH.

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Old 09-20-2012, 03:11 PM   #14
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It doesn't matter if use LP or DSI. It doesn't seem to ever come on. After reading some Google stuff, I was thinking that its only an indicator if there's a problem and not to let you know that the water heater is on. Is that right?
Ours will only come on when using the lpg side of the heater if the burner does not light.
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