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 > DSI fault light on panel - Hot Water

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topher80

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Posted: 06/13/13 04:50pm Link  |  Quote  |  Print  |  Notify Moderator

I have a 2008 HR Neptune and on the inside panel (where all of the lights and indicators are, I have a 12V switch for hot water and a 120v switch. Above the switches is a small DSI Fault lite.

When on shore power and the 120 witch on it is not uncommon after a while for the DSI Fault lite to come on. I have a theory.

I am assuming that because we don't use all that much hot water that the DSI Fault switch is acting like a local circuit breaker because when that light comes on the water in the tank seems to cool down.

Conversely, when the 120v switch is on and there is no apparent fault (which make the like illuminate) the water is almost scolding it is so hot.

I ask the folks at camping world and they checked it out and claim it is related to the pilot on the gas side and that after the gas tries to ignite more than three times and it doesn't ignite it trips the fault.

Again, my theory is that the DSI fault light shuts of the electrical heater after it reaches temperature and after an extended period of time when no water is being drawn down from the tank.

Any thoughts, ideas? Thanks.


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2chiefsRus

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Posted: 06/13/13 05:00pm Link  |  Quote  |  Print  |  Notify Moderator

On ours it works like the folks at Camping World said - the DSI fault light comes on after the gas has failed to light for the 3rd time. The DSI fault light has never come on on ours when only the electric water heater is turned on no matter how long it is on.


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ScottG

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Posted: 06/13/13 05:07pm Link  |  Quote  |  Print  |  Notify Moderator

The light isn't any kind of a CB, it just comes on when the tank fails to light.


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Posted: 06/13/13 06:55pm Link  |  Quote  |  Print  |  Notify Moderator

The DSI fault light only pertains to the gas side of the water heater. If it's coming on when the gas is off and you're using 120 AC, then you have a weird issue where something is shorting out between the two systems.


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Posted: 06/13/13 07:52pm Link  |  Quote  |  Print  |  Notify Moderator

It sounds like you are using the propane switch and the 120 AC switch at the same time, and when the propane side fails to light the "Failed to light (RED) comes on indicating that it indeed failed to light. `The water heater should continue to heat on 120 AC electric even if the indicator light is ON. A lot of people do run their heater on both for a quicker heat up. Is that what you areding when this happens?


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dougrainer

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Posted: 06/14/13 05:41am Link  |  Quote  |  Print  |  Notify Moderator

Diplomat Don wrote:

The DSI fault light only pertains to the gas side of the water heater. If it's coming on when the gas is off and you're using 120 AC, then you have a weird issue where something is shorting out between the two systems.


IF the Electric side fails to shut OFF (defective tstat) and the ECO trips the DSI fault light will come on. IF you have the unit on LP AND 120 at the same time and the LP side fails to light, the DSI fault light will NOT come on. Doug

topher80

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Posted: 06/14/13 06:21am Link  |  Quote  |  Print  |  Notify Moderator

Thank you all for your comments. The gas switch is off, so it must be a weird thing...cause with the gas switch off it should not be faulting, right.

Guess I won't be worried about it provided I have hot water on shore power.

2chiefsRus

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Posted: 06/14/13 07:17am Link  |  Quote  |  Print  |  Notify Moderator

dougrainer wrote:

Diplomat Don wrote:

The DSI fault light only pertains to the gas side of the water heater. If it's coming on when the gas is off and you're using 120 AC, then you have a weird issue where something is shorting out between the two systems.


IF the Electric side fails to shut OFF (defective tstat) and the ECO trips the DSI fault light will come on. IF you have the unit on LP AND 120 at the same time and the LP side fails to light, the DSI fault light will NOT come on. Doug


What is the ECO?

dougrainer

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Posted: 06/14/13 09:25am Link  |  Quote  |  Print  |  Notify Moderator

2chiefsRus wrote:

dougrainer wrote:

Diplomat Don wrote:

The DSI fault light only pertains to the gas side of the water heater. If it's coming on when the gas is off and you're using 120 AC, then you have a weird issue where something is shorting out between the two systems.


IF the Electric side fails to shut OFF (defective tstat) and the ECO trips the DSI fault light will come on. IF you have the unit on LP AND 120 at the same time and the LP side fails to light, the DSI fault light will NOT come on. Doug


What is the ECO?


Hi limit cut off. If the tstat fails, IT will open and shut the appliance off. Most ECO switches are at the 170/180 limit.

ECO Electronic Cut Off Doug

dougrainer

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Posted: 06/14/13 09:28am Link  |  Quote  |  Print  |  Notify Moderator

topher80 wrote:

Thank you all for your comments. The gas switch is off, so it must be a weird thing...cause with the gas switch off it should not be faulting, right.

Guess I won't be worried about it provided I have hot water on shore power.


READ my post again. Your tstat is bad and the ECO is tripping causing the DSI fault light. THAT is the reason for your scalding hot water. The ECO trips at 180 degrees instead of the tstat tripping at the normal 130/40 degrees. Doug

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