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Old 05-16-2012, 02:18 PM   #11
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thanks for all the help. it turned out to be the check valve. it came to pieces. even though made of brass the internal is plastic and not very rugged. any idea why you have to have switch on gas on for electric elements to work? anyone else have a problem with sewer gas on rear a/c in this model? i did took filter grille off and you can see daylight on return side. two holes in coil case alow it to draw off roof when conditions right. my front a/c has same two holes. patched holes with metal tape time will tell if fixed.
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Old 05-16-2012, 02:37 PM   #12
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any idea why you have to have switch on gas on for electric elements to work?
Glad you found the no flow problem.

As far as your question above, we need more info.
Give us your water heater make and model so we can try to answer.

Any dual heat water heaters I have seen were not interconnected.
IE- you could use either gas or electric or both and one did not rely
on the other at all.
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Old 05-16-2012, 03:11 PM   #13
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"any idea why you have to have switch on gas on for electric elements to work?"

This is not true. The AC system is completely seperate from the 12VDC/Propane circuit. It sounds like your AC element is burned up or the AC circuit breaker in the converter panel is tripped.


"anyone else have a problem with sewer gas on rear a/c in this model? I did took filter grille off and you can see daylight on return side. two holes in coil case alow it to draw off roof when conditions right. my front a/c has same two holes. patched holes with metal tape time will tell if fixed."

Sounds like you have a handle on this.
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Old 05-16-2012, 05:42 PM   #14
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i am not sure why yet but 120 volts does not get on elements untill i switch gas switch on. the switch inside for electric heat will not do it by itself. it is a suburban model sw10de serial #021802393. the electric elements get water hot. but the wiring diagram above makes it seem off.
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Old 05-16-2012, 07:25 PM   #15
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i am not sure why yet but 120 volts does not get on elements untill i switch gas switch on. the switch inside for electric heat will not do it by itself. it is a suburban model sw10de serial #021802393. the electric elements get water hot. but the wiring diagram above makes it seem off.
Here is the manual for your heater. The only way that the AC element can heat the water is if the 120VAC circuit breaker in the power center is on and the black switch outside under the metal cover in on.

The switch inside has nothing to do with the AC water heater system.

So, Let me understand what you are trying to say:
Try this:

1) The AC circuit breaker - ON
2) The back switch outside - ON
3) Inside switch with light - OFF

PRESS BOTH RUBBER circled in the center.
If one goes in and pops right out you have a shorted element and it needs to be replaced.
If one goes in and stays, the hot water has gotten hotter than 120 degrees and popped to avoid scalding.

If both were IN then do this:

Is there 120 Volts AC at the element? (you will need to remove the rubber cover over the high limit switch and the plastic cover over the heating element.

Using a volt meter set for 250 volts place one probe on the high limit switch terminal or (one leg of the element) and the other one to the metal case. It should read approximately 120 volts.

If it does not you have a wiring problem to the heater.
If there is, the element or AC high limit switch is bad.

When you turn on the switch inside the camper you BYPASS the AC element and turn on the propane to heat the water. The water will get hot because of the propane and not the 120VAC.

If none of this makes sense (or more than you want to deal with) you may just need to call the service man.
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Old 05-16-2012, 07:32 PM   #16
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now it makes sense i thought the inside switch was for the electric element & outside switch for burner. thank you. i have no manuals on this rv. bought used 2 years agoit is a 2003 cardinal. i bought factory disc but very generac.
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Old 05-16-2012, 07:45 PM   #17
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There is every manual you will ever need and more on this forum.
You only need to ask. Someone will upload it or point you to it.

The white search box above the menu bar is your VERY best friend. Leave the "radio" button on FRF and use one or two search words and you will get what you need.
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Old 05-17-2012, 08:51 AM   #18
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now it makes sense i thought the inside switch was for the electric element & outside switch for burner. thank you. i have no manuals on this rv. bought used 2 years agoit is a 2003 cardinal. i bought factory disc but very generac.
Nope- it's the other way around.

Outside switch is electric heat
Inside switch (usually with a red light inside) is for gas heat

Note the red light usually just comes on momentarily. Once the burner
fires up the red light in the switch goes out.
If the red light comes on and stays on it usually means the burner has
failed to light.
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