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Old 03-18-2007, 06:09 AM   #1
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Am new to RVing and apologize if the question has been asked before or recently.

My hot water heater heats the water great, question I have is that it "faults". I checked the manual they provided with the coach and it says that it will do that when the water temps get too high. You can reset it by turning the heater off and waiting abit to turn it back on.

Will the fault clear itself when the water temp drops to a range that the unit finds acceptable?

I am using the rig for the first time since getting it and the heater has gone into fault 2x so far. Is this normal?

I know the residential heaters kick on and off as needed. Do these units do the same thing. I do know I had really hot water this morning so the thing works well.

Thanks
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Old 03-18-2007, 06:09 AM   #2
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Am new to RVing and apologize if the question has been asked before or recently.

My hot water heater heats the water great, question I have is that it "faults". I checked the manual they provided with the coach and it says that it will do that when the water temps get too high. You can reset it by turning the heater off and waiting abit to turn it back on.

Will the fault clear itself when the water temp drops to a range that the unit finds acceptable?

I am using the rig for the first time since getting it and the heater has gone into fault 2x so far. Is this normal?

I know the residential heaters kick on and off as needed. Do these units do the same thing. I do know I had really hot water this morning so the thing works well.

Thanks
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Old 03-18-2007, 06:13 AM   #3
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Could you please give maker and model # of the hot water heater.
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Old 03-18-2007, 06:25 AM   #4
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It is an Atwood MPD 93756
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Old 03-18-2007, 06:29 AM   #5
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We need the make of the water heater (usually either Atwood or Suburban) and if possible a model number. Does yours have both LP gas and electric modes? Do you light a pilot or does it have electronic ignition (called DSI- Direct Spark Ignition)?

In either case, yes they cycle on/off via a thermostat. They should not overheat as long as the tank has a continuous water supply available, either from the fresh water tank or from city water (hose). If for some reason the tank gets low on water it could overheat and a thermal cut-off will prevent fire or damage. The same thing would happen if the thermostat went bad and failed to shut off the heat.

What is the fault indication? A red light? Digital code?

If your heater has both gas & electric modes, does this happen in both modes or only one (either electric or gas)?
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Old 03-18-2007, 12:13 PM   #6
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Tom Sauls:
Am new to RVing and apologize if the question has been asked before or recently.

My hot water heater heats the water great, question I have is that it "faults". I checked the manual they provided with the coach and it says that it will do that when the water temps get too high. You can reset it by turning the heater off and waiting abit to turn it back on.

Will the fault clear itself when the water temp drops to a range that the unit finds acceptable?

I am using the rig for the first time since getting it and the heater has gone into fault 2x so far. Is this normal?

I know the residential heaters kick on and off as needed. Do these units do the same thing. I do know I had really hot water this morning so the thing works well.

Thanks </div></BLOCKQUOTE>

Tom,

There should be a black rubber pad with some wires going through it on the front of your water heater. Underneath that are your limit switches. They are suface mounted on the tank using a bayonet type mount made out of light sheet metal. Many times the ears on these mounts gets loose so that the limit switches are no longer making full contact with the tank so check to see if the switches are loose and simply press the ears on the mounts inward using a stick or simular object so that the limit switches are tight against the tank.

On my previous coach the water heater had been replaced and the tech who did the work left the limit switches loose. The water was so hot that it delaminated the shower surround when I rinsed it with straight hot water. Outside the coach the heat when the P&T valve blew melted and deformed the access panel for the refridgerator.

After this fix and making sure that I ran abount a gallon of water from one of the hot water spigots every time I hooked up the coach elimnated any repeat performances.

Let us know how things work out along with the make model and year of your coach.
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Old 03-18-2007, 01:03 PM   #7
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It is an Atwood MPD 93756.

The heater has an electric igniter and the fault is just a red light.

As far as I know it is only a LP heater.
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Old 03-18-2007, 06:24 PM   #8
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Tom Sauls:
...hot water heater... </div></BLOCKQUOTE>

Why do you want to heat hot water??
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Old 03-18-2007, 06:58 PM   #9
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I guess it is like unthawing meat....

Just one of those redundant statements. Maybe to make it even hotter?
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Old 03-19-2007, 12:20 AM   #10
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Tom Sauls:
It is an Atwood MPD 93756.

The heater has an electric igniter and the fault is just a red light.

As far as I know it is only a LP heater. </div></BLOCKQUOTE>

Tom,

What year, make and model of coach do you have and where is the light located. If the light is by the water heater switch this usually indicates that the pilot did not work correctly and that the burner did not ignite properly when it tried to fire. You could have a different problem then you think.
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Old 03-19-2007, 04:52 AM   #11
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It is an 06 Fleetwood Jamboree 31M 34'
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Old 03-19-2007, 12:18 PM   #12
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">It is an Atwood MPD 93756. </div></BLOCKQUOTE>
That sounds more like a part number for some piece of it. Atwood model numbers usually look something like "G6A-7LP" (6 gallon LP gas model).

As Neil says, the red light simply means the DSI failed to achieve ignition. That usually means either the DSI electrode is not close enough to the metal frame to generate a spark or it sparked but the LP gas did not ignite. Causes for that are dirt/spider webs/bees nests etc. in the gas chamber or low LP gas pressure (crud in the LP regulator back by the tank, for example).
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