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Hot Water Heater Won't Turn Off heats water to the point it was steaming out of faucet

#1 User is offline   Oregon_Camper 

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Posted 26 May 2008 - 11:15 PM

Flipped on the HWH and went off and did all my other setup routine. Finished all those...unloaded dirt bikes...had a cold beer...etc.

About 45 mins later I hear my HWH still burning. I know something is wrong. I checked fuses, but nothing really obvious to me is wrong. HWH said something about a thermo-coupler (??) is wired directly in line with the system.

Is this something that can easily be checked/fixed or do I need to have the Mobile RV guy come out and fix this?

Again..it is heating water fine...the flame is perfect blue flame. It just won't turn off.

#2 User is offline   Sluggo54 

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Posted 26 May 2008 - 11:22 PM

It's not the thermocouple. That critter supplies the electricity to open the main gas valve, but it does not keep it open. The thermostat keeps it open and the flame going. If that's bad and you're not comfortable with electronics, it looks like Mobile RV Guy. One other possibility - are you sure the tank was full? If it was not, the 'stat might not have been satisfied, thus the continuing burner superheating the water.

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#3 User is offline   Oregon_Camper 

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Posted 26 May 2008 - 11:50 PM

View PostSluggo54, on May 26 2008, 10:22 PM, said:

It's not the thermocouple. That critter supplies the electricity to open the main gas valve, but it does not keep it open. The thermostat keeps it open and the flame going. If that's bad and you're not comfortable with electronics, it looks like Mobile RV Guy. One other possibility - are you sure the tank was full? If it was not, the 'stat might not have been satisfied, thus the continuing burner superheating the water.

Sluggo


I'm "ok" with electronics....and given the right information, I should/might be able to fix this on my own.

As far as making sure the tank is full. How would I check that? I turn on the water pump...and it fills the hot water tank. I don't have the bypass lever flipped (to winterize) so I think it is filling up. We did take showers, and there was plenty of hot water. I just had to manually turn off the heater each time.

#4 User is offline   jozway 

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Posted 26 May 2008 - 11:56 PM

Probably a bad t-stat. Not sure where it is and how to replace it though. Does your manual say anything about it?
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#5 User is offline   LarryTheOutback 

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Posted 27 May 2008 - 12:25 AM

View PostOregon_Camper, on May 26 2008, 10:50 PM, said:

I'm "ok" with electronics....


I thought you were in marketing :devil2:

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#6 User is offline   Oregon_Camper 

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Posted 27 May 2008 - 12:43 AM

View PostLarryTheOutback, on May 26 2008, 11:25 PM, said:

View PostOregon_Camper, on May 26 2008, 10:50 PM, said:

I'm "ok" with electronics....


I thought you were in marketing :devil2:

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Whew...tough crowd around here. :P

#7 User is offline   CamperAndy 

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Posted 27 May 2008 - 12:55 AM

The thermostat is surface mounted to the tank and is held against the tank with black insulating tape. Open the outside access and you will see two items under the tape, one is the thermostat and the other is the over heat trip. Make sure the thermostat is pressed against the tank. The thermostat can go bad and short out but I think the first fault will be lack of contact to the tank.

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#8 User is offline   jrayburg 

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Posted 27 May 2008 - 12:27 PM

I just had to replace my t-stat this weekend.
The connection on the Right side had rusted out. (Not sure why)
The black insulation peels off and there are 3 metal tabs holding the t-stat firmly against the tank. I bent the tabs out and removed the small round t-stat. I reconnected the new t-stat to the wiring and replaced it. Quite easy. Good thing that's all it was.

I bet yours is just stuck on. The kit I bought was about $24 for both the left and right t-stats. I don't know why there are two different ones. One is black and one is brown. Maybe someone here knows which is which and what they do.

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#9 User is offline   Oregon_Camper 

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Posted 27 May 2008 - 01:22 PM

View PostCamperAndy, on May 26 2008, 11:55 PM, said:

The thermostat is surface mounted to the tank and is held against the tank with black insulating tape. Open the outside access and you will see two items under the tape, one is the thermostat and the other is the over heat trip. Make sure the thermostat is pressed against the tank. The thermostat can go bad and short out but I think the first fault will be lack of contact to the tank.

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Thanks Andy....

In your picture...the black tape is just below the drain...right?

Do i need new tape or will this tape restick again?

#10 User is offline   CamperAndy 

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Posted 28 May 2008 - 12:37 AM

It is right below the T & P safety valve. It should restick.
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#11 User is offline   jrayburg 

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Posted 09 June 2008 - 02:22 PM

Okay,
I did replace my t-stat. I turned on both the gas and electric switches in order to use them in unison. The gas fired up and I assumed the electric did it's job.

I used the shower about 15 minutes after replacing the t-stat. All was nice and warm.

2 hours later....no hot water. I went outside after running the hot faucet for about 5 minutes. The hot water heater did not fire up the gas.

I disconnected one of the wires from the t-stat and replaced it. The unit clicked a few times and fired right up. The water got boiling hot. The unit cut off after heating the tank and no more hot water.

If the electric is not heating the tank and the gas is not coming back on to replenish the hot water....what might be the cause?

Any ideas? Do I need to replace the ECO - Electric Cut Off? Is that what it's called? The kit I bought contained both.

I knew that the "fix" was too easy. By the way...I didn't mention that the connector tabs on the new t-stat were slightly larger than the original. I had to upsize both connectors.

I was hoping to avoid paying the dealer for this repair.

Thanks in advance for yall's help.
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#12 User is offline   CamperAndy 

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Posted 09 June 2008 - 05:20 PM

ECO should be Emergency Cut Off. The electric would use the same tstat as the gas.

Have you tried pulling the connector off the control board and cleaning the contacts?? It still sounds like a thermostat issue but a dirty connection will act simalarly. Last resort is to replace the control board.
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